20
Overview of HL-2A Experiment Results, Overview of HL-2A Experiment Results, OV/4-1 OV/4-1 Overview of HL-2A Experiment Overview of HL-2A Experiment Results Results S S outh outh W W estern estern I I nstitute of nstitute of P P hysics, Chengdu, China hysics, Chengdu, China Qingwei YANG for HL-2A Team Qingwei YANG for HL-2A Team 21 21 th th IAEA Fusion Energy Conference, Oct. 16~22, 2006, Chengdu, China IAEA Fusion Energy Conference, Oct. 16~22, 2006, Chengdu, China Cooperated with: Cooperated with: University of Science and Technology of China, Hefei, China University of Science and Technology of China, Hefei, China Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China Institute of Physics, Chinese Academy of Sciences, Beijing, China Institute of Physics, Chinese Academy of Sciences, Beijing, China Tsinghua University, Beijing, China Tsinghua University, Beijing, China MPI für Plasmaphysik MPI für Plasmaphysik , , Association Euratom Association Euratom, German , German Association Euratom-CEA, CEN Cadarache, France Association Euratom-CEA, CEN Cadarache, France GA, San Diego, USA GA, San Diego, USA NIFS, Toki, Japan NIFS, Toki, Japan JAEA, Naka, Japan JAEA, Naka, Japan Kurchatov Institute, Russia Kurchatov Institute, Russia

Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

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Page 1: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Overview of HL-2A Experiment ResultsOverview of HL-2A Experiment Results

SSouthouthWWestern estern IInstitute of nstitute of PPhysics Chengdu Chinahysics Chengdu China

Qingwei YANG for HL-2A TeamQingwei YANG for HL-2A Team

2121th th IAEA Fusion Energy Conference Oct 16~22 2006 Chengdu IAEA Fusion Energy Conference Oct 16~22 2006 Chengdu ChinaChina

Cooperated withCooperated with

University of Science and Technology of China Hefei ChinaUniversity of Science and Technology of China Hefei ChinaInstitute of Plasma Physics Chinese Academy of Sciences Hefei China Institute of Plasma Physics Chinese Academy of Sciences Hefei China

Institute of Physics Chinese Academy of Sciences Beijing China Institute of Physics Chinese Academy of Sciences Beijing China Tsinghua University Beijing ChinaTsinghua University Beijing China

MPI fuumlr PlasmaphysikMPI fuumlr Plasmaphysik Association EuratomAssociation Euratom German GermanAssociation Euratom-CEA CEN Cadarache FranceAssociation Euratom-CEA CEN Cadarache France

GA San Diego USAGA San Diego USANIFS Toki JapanNIFS Toki Japan

JAEA Naka Japan JAEA Naka Japan Kurchatov Institute RussiaKurchatov Institute Russia

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

OutlineOutline

bull Introduction

bull Operation regime

bull Physics studies

bull Summary and future plan

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

IntroductionIntroductionSince the last IAEA Fusion Energy Conference in 2004 the plasma

parameters of the HL-2A tokamak have been increased significantly with the improvement of the hardware The stable and reproducible discharges with divertor configuration have been obtained by reliable feedback control and wall conditioning techniques

Up to now the main plasma parameters are as follows

bullBT 28 T 27 T

bull IP 480 kA 400 kA

bullDuration 30 sbullPlasma density 60 x 1019 m-3

bullElectron temp gt 20 keVbull Ion temperaturegt 800 eVbullFuelling sys GP SMBI PIbullHeating sys ECRH LHCD NBI

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

SMBISMBIPellet Pellet

Injection Injection 2500kW 2500kW 1s 68GHz 1s 68GHz ECRHECCECRHECCDD

15MW15MW50keV2sNBI 50keV2sNBI systemsystem

2500kW2500kW1s 68GHz 1s 68GHz ECRHECCECRHECCDD

2500kW 2500kW 1S 1S 245GHz 245GHz LHCD LHCD systemsystem

Thomson Thomson ScatteringScattering

CXRCXRSS

8-Channel HCN 8-Channel HCN interferometerinterferometer

VUV spectrometerVUV spectrometer

MW reflectometerMW reflectometer

ECEECE

Fast scan probesFast scan probes

Neutral Neutral Particle Particle AnalyzerAnalyzer

SDD soft X ray SDD soft X ray spectrumspectrum

Bolometer amp Soft X ray Bolometer amp Soft X ray arraysarrays

Other Diagnostics hellip hellipOther Diagnostics hellip hellip

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Operation regimeOperation regime The sustained divertor discharges are achieved

by reliable feedback control The low single null divertor is the usually used configuration on HL-2A

The high density discharges are obtained by gas-puffing SMBI and PI

The Greenwald limit can be exceeded

05

0000 50

1q

a

neRBT

Disruption

Greenwald limit

SMBI

Disruption free

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

OutlineOutline

bull Introduction

bull Operation regime

bull Physics studiesPhysics studies

bull Summary and future plan

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Liquid nitrogenLiquid nitrogen temperature SMBI temperature SMBI Supersonic molecular beam injection (SMBI) system with gas pressure of

02~30 MPa and LN temperature

A cluster contains about 250 hydrogen atoms (in average) at pressure of 10 MPa in this measurements

The cold molecular beam (LN temperature) can penetrate into plasma deeply

The MBI with clusters may be of benefit for deeper fuelling LHYao et al this conf EXP3-21

P0 bar

SRS au

SRS~P014

center edge

Room TempLN Temp

SRS intensity of Rayleigh scattering

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Penetration depth scaling of SMBIPenetration depth scaling of SMBI The penetration depth is studied with FFT

analysis of modulated injection and tangential H-alpha array to detect the penetration depth

The penetration depth (working gas is at room temperature) is dependent on the plasma parameters and pressure of working gas

Asymmetric penetration using SMBI is observed in low density ( ~1times1019m-3) by ECE and soft X- ray The penetration depth is about 30 cm from the low field side (LFS) and only about 10 cm from the high field side (HFS)

306020 PTNCd ee

Amplitude

Phase

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Particle transport analysis with modulated MBIParticle transport analysis with modulated MBI

Particle transport is studied with modulated SMBI and microwave reflectometer

After the FFT the amplitude and the phase profiles of the first harmonic and high harmonics can be obtained

2)(2 D

Formula used

The particle diffusion coefficient on the Ohmic discharge is about 05 ~ 15m2s at ra = 06 ~ 075

It is about 14 of the electron heat diffusivity

0

1

2

3

4

5

25 27 29 31 33 35 37

fi rst harmoni c2nd harmoni cthi rd harmoni c

D(m2t)

r (cm)

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (1) Study of toroidal symmetry of GAM ZFs (1)

A novel design of three-step Langmuir probes is developed for ZF detection

The radial component of electric field and gradient of Er

The poloidal and toroidal coherencies of electric potential can be calculated using Φ1~Φ6 and Φ1~Φ11 respectively

rE fffr )2)(( 3211 232541 )2)(( rrE fffffr

]|)(|)()([)()(ˆ 233

221

233

2 ffvfvfBfb fr

)()()()( 213

3212

3 ffffvfvfB fr

Bdv ffr )( 31 BEv r 1

225

θ 65cmd

T PB I

Toroidal

Poloidal

Radial

40mmr

θ2 70mm θ1 45mm

Poloidal

12

3

4

5

67

8

9

10

1112

13

14

15

A

B

C

To explore the generation mechanism of the GAM ZFs squared cross-bicoherence is calculated

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (2) Study of toroidal symmetry of GAM ZFs (2) Toroidal symmetry (n ~ 0) of the GAM zonal

flow in a tokamak is identified for the first time

3-D spatial features of the GAM ZFs are analyzed simultaneously

Nonlinear three wave coupling is identified to be a plausible physical mechanism for the generation of the GAM ZFs

Studies of interactions between the ZFs and the ambient turbulences are in progress

KJZhao et al Physical Review Letters 96 (2006) 255004

LWYan et al this conf EXP4-35

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Confinement improvement after pelIet injectionConfinement improvement after pelIet injection

0

1 0 0

2 0 0

3 0 0

4 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashI(kA)

0

3

6

9

1 2

1 5

1 8

mdashVp(V)

0

1 5

3 0

4 5

6 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashne(10

12cm

-3)

0

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0 t ( m s )

mdashTe(au

)r=1cm

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

mdashTe(au

)r=35cm

0

0 0 4

0 0 8

0 1 2

0 1 6

0 2

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashVUV(a

u)

0

0 5

1

1 5

2

2 5

3

mdashBoL_

01(au)

0

0 0 6

0 1 2

0 1 8

0 2 4

0 3

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashβ

0

0 2

0 4

0 6

0 8

mdashτ

-50 -40 -30 -20 -10 0 10 20 30 40-50

0

50

100

150

200

250

300

r (cm)

Te

(au

)

shot4050

t=700mst=710mst=750mst=800ms

The q profile is reconstructed with TRANSP code using experimental data

The weak magnetic shear is achieved after PI

The improved confinement sustains about 500 ms

bull XTDing et al Chin Phys Lett Vol23 (2006) 2502

0

2

4

6

8

10

12

14

300 700 1100 1500 1900

r=202mm

r=238mm

Χ e m2s-1

t ms

Three pellets are injected during this time TeTi ~ 1

TeTi ~ 15

χe in plasma peripheral decreases after PI

Evidence of confinement time dependence of TeTi is observed

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Al and Ti are injected into plasma using laser blow-off

the transport of impurity in plasma center is slower than that in the outer region

The transient asymmetric profile inward transport and outward diffusion are observed using tomography of the soft X ray radiation

D 05 ~ 10 m2s V 1 ~10 ms at 02 lt ra lt 08

Investigation of impurity transport with LBOInvestigation of impurity transport with LBO

bull ZYCui YHuang PSun et al Chin Phys Lett Vol23 (2006) 2143

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Most of the plasma current quench time is 4~6 ms in the major disruptions

The induced loop-voltage is proportional to the current quench rate

The disruption regime in the dIP0S~tqS plane is identified

A new parameter is introduced to predict disruption The physical meaning of this parameter is the amplitude multiplies the period of MHD perturbation

The disruption mitigation by noble gas (Neon and Argon) puffing are demonstrated

Statistic analysis of disruptionStatistic analysis of disruption

dtB ~

JP0 MAm201 10

01

1000

ΔtS msm2

HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 2: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

OutlineOutline

bull Introduction

bull Operation regime

bull Physics studies

bull Summary and future plan

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

IntroductionIntroductionSince the last IAEA Fusion Energy Conference in 2004 the plasma

parameters of the HL-2A tokamak have been increased significantly with the improvement of the hardware The stable and reproducible discharges with divertor configuration have been obtained by reliable feedback control and wall conditioning techniques

Up to now the main plasma parameters are as follows

bullBT 28 T 27 T

bull IP 480 kA 400 kA

bullDuration 30 sbullPlasma density 60 x 1019 m-3

bullElectron temp gt 20 keVbull Ion temperaturegt 800 eVbullFuelling sys GP SMBI PIbullHeating sys ECRH LHCD NBI

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

SMBISMBIPellet Pellet

Injection Injection 2500kW 2500kW 1s 68GHz 1s 68GHz ECRHECCECRHECCDD

15MW15MW50keV2sNBI 50keV2sNBI systemsystem

2500kW2500kW1s 68GHz 1s 68GHz ECRHECCECRHECCDD

2500kW 2500kW 1S 1S 245GHz 245GHz LHCD LHCD systemsystem

Thomson Thomson ScatteringScattering

CXRCXRSS

8-Channel HCN 8-Channel HCN interferometerinterferometer

VUV spectrometerVUV spectrometer

MW reflectometerMW reflectometer

ECEECE

Fast scan probesFast scan probes

Neutral Neutral Particle Particle AnalyzerAnalyzer

SDD soft X ray SDD soft X ray spectrumspectrum

Bolometer amp Soft X ray Bolometer amp Soft X ray arraysarrays

Other Diagnostics hellip hellipOther Diagnostics hellip hellip

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Operation regimeOperation regime The sustained divertor discharges are achieved

by reliable feedback control The low single null divertor is the usually used configuration on HL-2A

The high density discharges are obtained by gas-puffing SMBI and PI

The Greenwald limit can be exceeded

05

0000 50

1q

a

neRBT

Disruption

Greenwald limit

SMBI

Disruption free

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

OutlineOutline

bull Introduction

bull Operation regime

bull Physics studiesPhysics studies

bull Summary and future plan

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Liquid nitrogenLiquid nitrogen temperature SMBI temperature SMBI Supersonic molecular beam injection (SMBI) system with gas pressure of

02~30 MPa and LN temperature

A cluster contains about 250 hydrogen atoms (in average) at pressure of 10 MPa in this measurements

The cold molecular beam (LN temperature) can penetrate into plasma deeply

The MBI with clusters may be of benefit for deeper fuelling LHYao et al this conf EXP3-21

P0 bar

SRS au

SRS~P014

center edge

Room TempLN Temp

SRS intensity of Rayleigh scattering

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Penetration depth scaling of SMBIPenetration depth scaling of SMBI The penetration depth is studied with FFT

analysis of modulated injection and tangential H-alpha array to detect the penetration depth

The penetration depth (working gas is at room temperature) is dependent on the plasma parameters and pressure of working gas

Asymmetric penetration using SMBI is observed in low density ( ~1times1019m-3) by ECE and soft X- ray The penetration depth is about 30 cm from the low field side (LFS) and only about 10 cm from the high field side (HFS)

306020 PTNCd ee

Amplitude

Phase

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Particle transport analysis with modulated MBIParticle transport analysis with modulated MBI

Particle transport is studied with modulated SMBI and microwave reflectometer

After the FFT the amplitude and the phase profiles of the first harmonic and high harmonics can be obtained

2)(2 D

Formula used

The particle diffusion coefficient on the Ohmic discharge is about 05 ~ 15m2s at ra = 06 ~ 075

It is about 14 of the electron heat diffusivity

0

1

2

3

4

5

25 27 29 31 33 35 37

fi rst harmoni c2nd harmoni cthi rd harmoni c

D(m2t)

r (cm)

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (1) Study of toroidal symmetry of GAM ZFs (1)

A novel design of three-step Langmuir probes is developed for ZF detection

The radial component of electric field and gradient of Er

The poloidal and toroidal coherencies of electric potential can be calculated using Φ1~Φ6 and Φ1~Φ11 respectively

rE fffr )2)(( 3211 232541 )2)(( rrE fffffr

]|)(|)()([)()(ˆ 233

221

233

2 ffvfvfBfb fr

)()()()( 213

3212

3 ffffvfvfB fr

Bdv ffr )( 31 BEv r 1

225

θ 65cmd

T PB I

Toroidal

Poloidal

Radial

40mmr

θ2 70mm θ1 45mm

Poloidal

12

3

4

5

67

8

9

10

1112

13

14

15

A

B

C

To explore the generation mechanism of the GAM ZFs squared cross-bicoherence is calculated

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (2) Study of toroidal symmetry of GAM ZFs (2) Toroidal symmetry (n ~ 0) of the GAM zonal

flow in a tokamak is identified for the first time

3-D spatial features of the GAM ZFs are analyzed simultaneously

Nonlinear three wave coupling is identified to be a plausible physical mechanism for the generation of the GAM ZFs

Studies of interactions between the ZFs and the ambient turbulences are in progress

KJZhao et al Physical Review Letters 96 (2006) 255004

LWYan et al this conf EXP4-35

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Confinement improvement after pelIet injectionConfinement improvement after pelIet injection

0

1 0 0

2 0 0

3 0 0

4 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashI(kA)

0

3

6

9

1 2

1 5

1 8

mdashVp(V)

0

1 5

3 0

4 5

6 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashne(10

12cm

-3)

0

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0 t ( m s )

mdashTe(au

)r=1cm

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

mdashTe(au

)r=35cm

0

0 0 4

0 0 8

0 1 2

0 1 6

0 2

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashVUV(a

u)

0

0 5

1

1 5

2

2 5

3

mdashBoL_

01(au)

0

0 0 6

0 1 2

0 1 8

0 2 4

0 3

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashβ

0

0 2

0 4

0 6

0 8

mdashτ

-50 -40 -30 -20 -10 0 10 20 30 40-50

0

50

100

150

200

250

300

r (cm)

Te

(au

)

shot4050

t=700mst=710mst=750mst=800ms

The q profile is reconstructed with TRANSP code using experimental data

The weak magnetic shear is achieved after PI

The improved confinement sustains about 500 ms

bull XTDing et al Chin Phys Lett Vol23 (2006) 2502

0

2

4

6

8

10

12

14

300 700 1100 1500 1900

r=202mm

r=238mm

Χ e m2s-1

t ms

Three pellets are injected during this time TeTi ~ 1

TeTi ~ 15

χe in plasma peripheral decreases after PI

Evidence of confinement time dependence of TeTi is observed

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Al and Ti are injected into plasma using laser blow-off

the transport of impurity in plasma center is slower than that in the outer region

The transient asymmetric profile inward transport and outward diffusion are observed using tomography of the soft X ray radiation

D 05 ~ 10 m2s V 1 ~10 ms at 02 lt ra lt 08

Investigation of impurity transport with LBOInvestigation of impurity transport with LBO

bull ZYCui YHuang PSun et al Chin Phys Lett Vol23 (2006) 2143

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Most of the plasma current quench time is 4~6 ms in the major disruptions

The induced loop-voltage is proportional to the current quench rate

The disruption regime in the dIP0S~tqS plane is identified

A new parameter is introduced to predict disruption The physical meaning of this parameter is the amplitude multiplies the period of MHD perturbation

The disruption mitigation by noble gas (Neon and Argon) puffing are demonstrated

Statistic analysis of disruptionStatistic analysis of disruption

dtB ~

JP0 MAm201 10

01

1000

ΔtS msm2

HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 3: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

IntroductionIntroductionSince the last IAEA Fusion Energy Conference in 2004 the plasma

parameters of the HL-2A tokamak have been increased significantly with the improvement of the hardware The stable and reproducible discharges with divertor configuration have been obtained by reliable feedback control and wall conditioning techniques

Up to now the main plasma parameters are as follows

bullBT 28 T 27 T

bull IP 480 kA 400 kA

bullDuration 30 sbullPlasma density 60 x 1019 m-3

bullElectron temp gt 20 keVbull Ion temperaturegt 800 eVbullFuelling sys GP SMBI PIbullHeating sys ECRH LHCD NBI

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

SMBISMBIPellet Pellet

Injection Injection 2500kW 2500kW 1s 68GHz 1s 68GHz ECRHECCECRHECCDD

15MW15MW50keV2sNBI 50keV2sNBI systemsystem

2500kW2500kW1s 68GHz 1s 68GHz ECRHECCECRHECCDD

2500kW 2500kW 1S 1S 245GHz 245GHz LHCD LHCD systemsystem

Thomson Thomson ScatteringScattering

CXRCXRSS

8-Channel HCN 8-Channel HCN interferometerinterferometer

VUV spectrometerVUV spectrometer

MW reflectometerMW reflectometer

ECEECE

Fast scan probesFast scan probes

Neutral Neutral Particle Particle AnalyzerAnalyzer

SDD soft X ray SDD soft X ray spectrumspectrum

Bolometer amp Soft X ray Bolometer amp Soft X ray arraysarrays

Other Diagnostics hellip hellipOther Diagnostics hellip hellip

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Operation regimeOperation regime The sustained divertor discharges are achieved

by reliable feedback control The low single null divertor is the usually used configuration on HL-2A

The high density discharges are obtained by gas-puffing SMBI and PI

The Greenwald limit can be exceeded

05

0000 50

1q

a

neRBT

Disruption

Greenwald limit

SMBI

Disruption free

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

OutlineOutline

bull Introduction

bull Operation regime

bull Physics studiesPhysics studies

bull Summary and future plan

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Liquid nitrogenLiquid nitrogen temperature SMBI temperature SMBI Supersonic molecular beam injection (SMBI) system with gas pressure of

02~30 MPa and LN temperature

A cluster contains about 250 hydrogen atoms (in average) at pressure of 10 MPa in this measurements

The cold molecular beam (LN temperature) can penetrate into plasma deeply

The MBI with clusters may be of benefit for deeper fuelling LHYao et al this conf EXP3-21

P0 bar

SRS au

SRS~P014

center edge

Room TempLN Temp

SRS intensity of Rayleigh scattering

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Penetration depth scaling of SMBIPenetration depth scaling of SMBI The penetration depth is studied with FFT

analysis of modulated injection and tangential H-alpha array to detect the penetration depth

The penetration depth (working gas is at room temperature) is dependent on the plasma parameters and pressure of working gas

Asymmetric penetration using SMBI is observed in low density ( ~1times1019m-3) by ECE and soft X- ray The penetration depth is about 30 cm from the low field side (LFS) and only about 10 cm from the high field side (HFS)

306020 PTNCd ee

Amplitude

Phase

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Particle transport analysis with modulated MBIParticle transport analysis with modulated MBI

Particle transport is studied with modulated SMBI and microwave reflectometer

After the FFT the amplitude and the phase profiles of the first harmonic and high harmonics can be obtained

2)(2 D

Formula used

The particle diffusion coefficient on the Ohmic discharge is about 05 ~ 15m2s at ra = 06 ~ 075

It is about 14 of the electron heat diffusivity

0

1

2

3

4

5

25 27 29 31 33 35 37

fi rst harmoni c2nd harmoni cthi rd harmoni c

D(m2t)

r (cm)

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (1) Study of toroidal symmetry of GAM ZFs (1)

A novel design of three-step Langmuir probes is developed for ZF detection

The radial component of electric field and gradient of Er

The poloidal and toroidal coherencies of electric potential can be calculated using Φ1~Φ6 and Φ1~Φ11 respectively

rE fffr )2)(( 3211 232541 )2)(( rrE fffffr

]|)(|)()([)()(ˆ 233

221

233

2 ffvfvfBfb fr

)()()()( 213

3212

3 ffffvfvfB fr

Bdv ffr )( 31 BEv r 1

225

θ 65cmd

T PB I

Toroidal

Poloidal

Radial

40mmr

θ2 70mm θ1 45mm

Poloidal

12

3

4

5

67

8

9

10

1112

13

14

15

A

B

C

To explore the generation mechanism of the GAM ZFs squared cross-bicoherence is calculated

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (2) Study of toroidal symmetry of GAM ZFs (2) Toroidal symmetry (n ~ 0) of the GAM zonal

flow in a tokamak is identified for the first time

3-D spatial features of the GAM ZFs are analyzed simultaneously

Nonlinear three wave coupling is identified to be a plausible physical mechanism for the generation of the GAM ZFs

Studies of interactions between the ZFs and the ambient turbulences are in progress

KJZhao et al Physical Review Letters 96 (2006) 255004

LWYan et al this conf EXP4-35

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Confinement improvement after pelIet injectionConfinement improvement after pelIet injection

0

1 0 0

2 0 0

3 0 0

4 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashI(kA)

0

3

6

9

1 2

1 5

1 8

mdashVp(V)

0

1 5

3 0

4 5

6 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashne(10

12cm

-3)

0

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0 t ( m s )

mdashTe(au

)r=1cm

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

mdashTe(au

)r=35cm

0

0 0 4

0 0 8

0 1 2

0 1 6

0 2

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashVUV(a

u)

0

0 5

1

1 5

2

2 5

3

mdashBoL_

01(au)

0

0 0 6

0 1 2

0 1 8

0 2 4

0 3

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashβ

0

0 2

0 4

0 6

0 8

mdashτ

-50 -40 -30 -20 -10 0 10 20 30 40-50

0

50

100

150

200

250

300

r (cm)

Te

(au

)

shot4050

t=700mst=710mst=750mst=800ms

The q profile is reconstructed with TRANSP code using experimental data

The weak magnetic shear is achieved after PI

The improved confinement sustains about 500 ms

bull XTDing et al Chin Phys Lett Vol23 (2006) 2502

0

2

4

6

8

10

12

14

300 700 1100 1500 1900

r=202mm

r=238mm

Χ e m2s-1

t ms

Three pellets are injected during this time TeTi ~ 1

TeTi ~ 15

χe in plasma peripheral decreases after PI

Evidence of confinement time dependence of TeTi is observed

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Al and Ti are injected into plasma using laser blow-off

the transport of impurity in plasma center is slower than that in the outer region

The transient asymmetric profile inward transport and outward diffusion are observed using tomography of the soft X ray radiation

D 05 ~ 10 m2s V 1 ~10 ms at 02 lt ra lt 08

Investigation of impurity transport with LBOInvestigation of impurity transport with LBO

bull ZYCui YHuang PSun et al Chin Phys Lett Vol23 (2006) 2143

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Most of the plasma current quench time is 4~6 ms in the major disruptions

The induced loop-voltage is proportional to the current quench rate

The disruption regime in the dIP0S~tqS plane is identified

A new parameter is introduced to predict disruption The physical meaning of this parameter is the amplitude multiplies the period of MHD perturbation

The disruption mitigation by noble gas (Neon and Argon) puffing are demonstrated

Statistic analysis of disruptionStatistic analysis of disruption

dtB ~

JP0 MAm201 10

01

1000

ΔtS msm2

HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 4: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

SMBISMBIPellet Pellet

Injection Injection 2500kW 2500kW 1s 68GHz 1s 68GHz ECRHECCECRHECCDD

15MW15MW50keV2sNBI 50keV2sNBI systemsystem

2500kW2500kW1s 68GHz 1s 68GHz ECRHECCECRHECCDD

2500kW 2500kW 1S 1S 245GHz 245GHz LHCD LHCD systemsystem

Thomson Thomson ScatteringScattering

CXRCXRSS

8-Channel HCN 8-Channel HCN interferometerinterferometer

VUV spectrometerVUV spectrometer

MW reflectometerMW reflectometer

ECEECE

Fast scan probesFast scan probes

Neutral Neutral Particle Particle AnalyzerAnalyzer

SDD soft X ray SDD soft X ray spectrumspectrum

Bolometer amp Soft X ray Bolometer amp Soft X ray arraysarrays

Other Diagnostics hellip hellipOther Diagnostics hellip hellip

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Operation regimeOperation regime The sustained divertor discharges are achieved

by reliable feedback control The low single null divertor is the usually used configuration on HL-2A

The high density discharges are obtained by gas-puffing SMBI and PI

The Greenwald limit can be exceeded

05

0000 50

1q

a

neRBT

Disruption

Greenwald limit

SMBI

Disruption free

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

OutlineOutline

bull Introduction

bull Operation regime

bull Physics studiesPhysics studies

bull Summary and future plan

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Liquid nitrogenLiquid nitrogen temperature SMBI temperature SMBI Supersonic molecular beam injection (SMBI) system with gas pressure of

02~30 MPa and LN temperature

A cluster contains about 250 hydrogen atoms (in average) at pressure of 10 MPa in this measurements

The cold molecular beam (LN temperature) can penetrate into plasma deeply

The MBI with clusters may be of benefit for deeper fuelling LHYao et al this conf EXP3-21

P0 bar

SRS au

SRS~P014

center edge

Room TempLN Temp

SRS intensity of Rayleigh scattering

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Penetration depth scaling of SMBIPenetration depth scaling of SMBI The penetration depth is studied with FFT

analysis of modulated injection and tangential H-alpha array to detect the penetration depth

The penetration depth (working gas is at room temperature) is dependent on the plasma parameters and pressure of working gas

Asymmetric penetration using SMBI is observed in low density ( ~1times1019m-3) by ECE and soft X- ray The penetration depth is about 30 cm from the low field side (LFS) and only about 10 cm from the high field side (HFS)

306020 PTNCd ee

Amplitude

Phase

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Particle transport analysis with modulated MBIParticle transport analysis with modulated MBI

Particle transport is studied with modulated SMBI and microwave reflectometer

After the FFT the amplitude and the phase profiles of the first harmonic and high harmonics can be obtained

2)(2 D

Formula used

The particle diffusion coefficient on the Ohmic discharge is about 05 ~ 15m2s at ra = 06 ~ 075

It is about 14 of the electron heat diffusivity

0

1

2

3

4

5

25 27 29 31 33 35 37

fi rst harmoni c2nd harmoni cthi rd harmoni c

D(m2t)

r (cm)

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (1) Study of toroidal symmetry of GAM ZFs (1)

A novel design of three-step Langmuir probes is developed for ZF detection

The radial component of electric field and gradient of Er

The poloidal and toroidal coherencies of electric potential can be calculated using Φ1~Φ6 and Φ1~Φ11 respectively

rE fffr )2)(( 3211 232541 )2)(( rrE fffffr

]|)(|)()([)()(ˆ 233

221

233

2 ffvfvfBfb fr

)()()()( 213

3212

3 ffffvfvfB fr

Bdv ffr )( 31 BEv r 1

225

θ 65cmd

T PB I

Toroidal

Poloidal

Radial

40mmr

θ2 70mm θ1 45mm

Poloidal

12

3

4

5

67

8

9

10

1112

13

14

15

A

B

C

To explore the generation mechanism of the GAM ZFs squared cross-bicoherence is calculated

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (2) Study of toroidal symmetry of GAM ZFs (2) Toroidal symmetry (n ~ 0) of the GAM zonal

flow in a tokamak is identified for the first time

3-D spatial features of the GAM ZFs are analyzed simultaneously

Nonlinear three wave coupling is identified to be a plausible physical mechanism for the generation of the GAM ZFs

Studies of interactions between the ZFs and the ambient turbulences are in progress

KJZhao et al Physical Review Letters 96 (2006) 255004

LWYan et al this conf EXP4-35

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Confinement improvement after pelIet injectionConfinement improvement after pelIet injection

0

1 0 0

2 0 0

3 0 0

4 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashI(kA)

0

3

6

9

1 2

1 5

1 8

mdashVp(V)

0

1 5

3 0

4 5

6 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashne(10

12cm

-3)

0

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0 t ( m s )

mdashTe(au

)r=1cm

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

mdashTe(au

)r=35cm

0

0 0 4

0 0 8

0 1 2

0 1 6

0 2

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashVUV(a

u)

0

0 5

1

1 5

2

2 5

3

mdashBoL_

01(au)

0

0 0 6

0 1 2

0 1 8

0 2 4

0 3

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashβ

0

0 2

0 4

0 6

0 8

mdashτ

-50 -40 -30 -20 -10 0 10 20 30 40-50

0

50

100

150

200

250

300

r (cm)

Te

(au

)

shot4050

t=700mst=710mst=750mst=800ms

The q profile is reconstructed with TRANSP code using experimental data

The weak magnetic shear is achieved after PI

The improved confinement sustains about 500 ms

bull XTDing et al Chin Phys Lett Vol23 (2006) 2502

0

2

4

6

8

10

12

14

300 700 1100 1500 1900

r=202mm

r=238mm

Χ e m2s-1

t ms

Three pellets are injected during this time TeTi ~ 1

TeTi ~ 15

χe in plasma peripheral decreases after PI

Evidence of confinement time dependence of TeTi is observed

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Al and Ti are injected into plasma using laser blow-off

the transport of impurity in plasma center is slower than that in the outer region

The transient asymmetric profile inward transport and outward diffusion are observed using tomography of the soft X ray radiation

D 05 ~ 10 m2s V 1 ~10 ms at 02 lt ra lt 08

Investigation of impurity transport with LBOInvestigation of impurity transport with LBO

bull ZYCui YHuang PSun et al Chin Phys Lett Vol23 (2006) 2143

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Most of the plasma current quench time is 4~6 ms in the major disruptions

The induced loop-voltage is proportional to the current quench rate

The disruption regime in the dIP0S~tqS plane is identified

A new parameter is introduced to predict disruption The physical meaning of this parameter is the amplitude multiplies the period of MHD perturbation

The disruption mitigation by noble gas (Neon and Argon) puffing are demonstrated

Statistic analysis of disruptionStatistic analysis of disruption

dtB ~

JP0 MAm201 10

01

1000

ΔtS msm2

HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 5: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Operation regimeOperation regime The sustained divertor discharges are achieved

by reliable feedback control The low single null divertor is the usually used configuration on HL-2A

The high density discharges are obtained by gas-puffing SMBI and PI

The Greenwald limit can be exceeded

05

0000 50

1q

a

neRBT

Disruption

Greenwald limit

SMBI

Disruption free

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

OutlineOutline

bull Introduction

bull Operation regime

bull Physics studiesPhysics studies

bull Summary and future plan

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Liquid nitrogenLiquid nitrogen temperature SMBI temperature SMBI Supersonic molecular beam injection (SMBI) system with gas pressure of

02~30 MPa and LN temperature

A cluster contains about 250 hydrogen atoms (in average) at pressure of 10 MPa in this measurements

The cold molecular beam (LN temperature) can penetrate into plasma deeply

The MBI with clusters may be of benefit for deeper fuelling LHYao et al this conf EXP3-21

P0 bar

SRS au

SRS~P014

center edge

Room TempLN Temp

SRS intensity of Rayleigh scattering

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Penetration depth scaling of SMBIPenetration depth scaling of SMBI The penetration depth is studied with FFT

analysis of modulated injection and tangential H-alpha array to detect the penetration depth

The penetration depth (working gas is at room temperature) is dependent on the plasma parameters and pressure of working gas

Asymmetric penetration using SMBI is observed in low density ( ~1times1019m-3) by ECE and soft X- ray The penetration depth is about 30 cm from the low field side (LFS) and only about 10 cm from the high field side (HFS)

306020 PTNCd ee

Amplitude

Phase

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Particle transport analysis with modulated MBIParticle transport analysis with modulated MBI

Particle transport is studied with modulated SMBI and microwave reflectometer

After the FFT the amplitude and the phase profiles of the first harmonic and high harmonics can be obtained

2)(2 D

Formula used

The particle diffusion coefficient on the Ohmic discharge is about 05 ~ 15m2s at ra = 06 ~ 075

It is about 14 of the electron heat diffusivity

0

1

2

3

4

5

25 27 29 31 33 35 37

fi rst harmoni c2nd harmoni cthi rd harmoni c

D(m2t)

r (cm)

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (1) Study of toroidal symmetry of GAM ZFs (1)

A novel design of three-step Langmuir probes is developed for ZF detection

The radial component of electric field and gradient of Er

The poloidal and toroidal coherencies of electric potential can be calculated using Φ1~Φ6 and Φ1~Φ11 respectively

rE fffr )2)(( 3211 232541 )2)(( rrE fffffr

]|)(|)()([)()(ˆ 233

221

233

2 ffvfvfBfb fr

)()()()( 213

3212

3 ffffvfvfB fr

Bdv ffr )( 31 BEv r 1

225

θ 65cmd

T PB I

Toroidal

Poloidal

Radial

40mmr

θ2 70mm θ1 45mm

Poloidal

12

3

4

5

67

8

9

10

1112

13

14

15

A

B

C

To explore the generation mechanism of the GAM ZFs squared cross-bicoherence is calculated

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (2) Study of toroidal symmetry of GAM ZFs (2) Toroidal symmetry (n ~ 0) of the GAM zonal

flow in a tokamak is identified for the first time

3-D spatial features of the GAM ZFs are analyzed simultaneously

Nonlinear three wave coupling is identified to be a plausible physical mechanism for the generation of the GAM ZFs

Studies of interactions between the ZFs and the ambient turbulences are in progress

KJZhao et al Physical Review Letters 96 (2006) 255004

LWYan et al this conf EXP4-35

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Confinement improvement after pelIet injectionConfinement improvement after pelIet injection

0

1 0 0

2 0 0

3 0 0

4 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashI(kA)

0

3

6

9

1 2

1 5

1 8

mdashVp(V)

0

1 5

3 0

4 5

6 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashne(10

12cm

-3)

0

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0 t ( m s )

mdashTe(au

)r=1cm

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

mdashTe(au

)r=35cm

0

0 0 4

0 0 8

0 1 2

0 1 6

0 2

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashVUV(a

u)

0

0 5

1

1 5

2

2 5

3

mdashBoL_

01(au)

0

0 0 6

0 1 2

0 1 8

0 2 4

0 3

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashβ

0

0 2

0 4

0 6

0 8

mdashτ

-50 -40 -30 -20 -10 0 10 20 30 40-50

0

50

100

150

200

250

300

r (cm)

Te

(au

)

shot4050

t=700mst=710mst=750mst=800ms

The q profile is reconstructed with TRANSP code using experimental data

The weak magnetic shear is achieved after PI

The improved confinement sustains about 500 ms

bull XTDing et al Chin Phys Lett Vol23 (2006) 2502

0

2

4

6

8

10

12

14

300 700 1100 1500 1900

r=202mm

r=238mm

Χ e m2s-1

t ms

Three pellets are injected during this time TeTi ~ 1

TeTi ~ 15

χe in plasma peripheral decreases after PI

Evidence of confinement time dependence of TeTi is observed

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Al and Ti are injected into plasma using laser blow-off

the transport of impurity in plasma center is slower than that in the outer region

The transient asymmetric profile inward transport and outward diffusion are observed using tomography of the soft X ray radiation

D 05 ~ 10 m2s V 1 ~10 ms at 02 lt ra lt 08

Investigation of impurity transport with LBOInvestigation of impurity transport with LBO

bull ZYCui YHuang PSun et al Chin Phys Lett Vol23 (2006) 2143

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Most of the plasma current quench time is 4~6 ms in the major disruptions

The induced loop-voltage is proportional to the current quench rate

The disruption regime in the dIP0S~tqS plane is identified

A new parameter is introduced to predict disruption The physical meaning of this parameter is the amplitude multiplies the period of MHD perturbation

The disruption mitigation by noble gas (Neon and Argon) puffing are demonstrated

Statistic analysis of disruptionStatistic analysis of disruption

dtB ~

JP0 MAm201 10

01

1000

ΔtS msm2

HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 6: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

OutlineOutline

bull Introduction

bull Operation regime

bull Physics studiesPhysics studies

bull Summary and future plan

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Liquid nitrogenLiquid nitrogen temperature SMBI temperature SMBI Supersonic molecular beam injection (SMBI) system with gas pressure of

02~30 MPa and LN temperature

A cluster contains about 250 hydrogen atoms (in average) at pressure of 10 MPa in this measurements

The cold molecular beam (LN temperature) can penetrate into plasma deeply

The MBI with clusters may be of benefit for deeper fuelling LHYao et al this conf EXP3-21

P0 bar

SRS au

SRS~P014

center edge

Room TempLN Temp

SRS intensity of Rayleigh scattering

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Penetration depth scaling of SMBIPenetration depth scaling of SMBI The penetration depth is studied with FFT

analysis of modulated injection and tangential H-alpha array to detect the penetration depth

The penetration depth (working gas is at room temperature) is dependent on the plasma parameters and pressure of working gas

Asymmetric penetration using SMBI is observed in low density ( ~1times1019m-3) by ECE and soft X- ray The penetration depth is about 30 cm from the low field side (LFS) and only about 10 cm from the high field side (HFS)

306020 PTNCd ee

Amplitude

Phase

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Particle transport analysis with modulated MBIParticle transport analysis with modulated MBI

Particle transport is studied with modulated SMBI and microwave reflectometer

After the FFT the amplitude and the phase profiles of the first harmonic and high harmonics can be obtained

2)(2 D

Formula used

The particle diffusion coefficient on the Ohmic discharge is about 05 ~ 15m2s at ra = 06 ~ 075

It is about 14 of the electron heat diffusivity

0

1

2

3

4

5

25 27 29 31 33 35 37

fi rst harmoni c2nd harmoni cthi rd harmoni c

D(m2t)

r (cm)

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (1) Study of toroidal symmetry of GAM ZFs (1)

A novel design of three-step Langmuir probes is developed for ZF detection

The radial component of electric field and gradient of Er

The poloidal and toroidal coherencies of electric potential can be calculated using Φ1~Φ6 and Φ1~Φ11 respectively

rE fffr )2)(( 3211 232541 )2)(( rrE fffffr

]|)(|)()([)()(ˆ 233

221

233

2 ffvfvfBfb fr

)()()()( 213

3212

3 ffffvfvfB fr

Bdv ffr )( 31 BEv r 1

225

θ 65cmd

T PB I

Toroidal

Poloidal

Radial

40mmr

θ2 70mm θ1 45mm

Poloidal

12

3

4

5

67

8

9

10

1112

13

14

15

A

B

C

To explore the generation mechanism of the GAM ZFs squared cross-bicoherence is calculated

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (2) Study of toroidal symmetry of GAM ZFs (2) Toroidal symmetry (n ~ 0) of the GAM zonal

flow in a tokamak is identified for the first time

3-D spatial features of the GAM ZFs are analyzed simultaneously

Nonlinear three wave coupling is identified to be a plausible physical mechanism for the generation of the GAM ZFs

Studies of interactions between the ZFs and the ambient turbulences are in progress

KJZhao et al Physical Review Letters 96 (2006) 255004

LWYan et al this conf EXP4-35

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Confinement improvement after pelIet injectionConfinement improvement after pelIet injection

0

1 0 0

2 0 0

3 0 0

4 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashI(kA)

0

3

6

9

1 2

1 5

1 8

mdashVp(V)

0

1 5

3 0

4 5

6 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashne(10

12cm

-3)

0

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0 t ( m s )

mdashTe(au

)r=1cm

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

mdashTe(au

)r=35cm

0

0 0 4

0 0 8

0 1 2

0 1 6

0 2

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashVUV(a

u)

0

0 5

1

1 5

2

2 5

3

mdashBoL_

01(au)

0

0 0 6

0 1 2

0 1 8

0 2 4

0 3

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashβ

0

0 2

0 4

0 6

0 8

mdashτ

-50 -40 -30 -20 -10 0 10 20 30 40-50

0

50

100

150

200

250

300

r (cm)

Te

(au

)

shot4050

t=700mst=710mst=750mst=800ms

The q profile is reconstructed with TRANSP code using experimental data

The weak magnetic shear is achieved after PI

The improved confinement sustains about 500 ms

bull XTDing et al Chin Phys Lett Vol23 (2006) 2502

0

2

4

6

8

10

12

14

300 700 1100 1500 1900

r=202mm

r=238mm

Χ e m2s-1

t ms

Three pellets are injected during this time TeTi ~ 1

TeTi ~ 15

χe in plasma peripheral decreases after PI

Evidence of confinement time dependence of TeTi is observed

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Al and Ti are injected into plasma using laser blow-off

the transport of impurity in plasma center is slower than that in the outer region

The transient asymmetric profile inward transport and outward diffusion are observed using tomography of the soft X ray radiation

D 05 ~ 10 m2s V 1 ~10 ms at 02 lt ra lt 08

Investigation of impurity transport with LBOInvestigation of impurity transport with LBO

bull ZYCui YHuang PSun et al Chin Phys Lett Vol23 (2006) 2143

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Most of the plasma current quench time is 4~6 ms in the major disruptions

The induced loop-voltage is proportional to the current quench rate

The disruption regime in the dIP0S~tqS plane is identified

A new parameter is introduced to predict disruption The physical meaning of this parameter is the amplitude multiplies the period of MHD perturbation

The disruption mitigation by noble gas (Neon and Argon) puffing are demonstrated

Statistic analysis of disruptionStatistic analysis of disruption

dtB ~

JP0 MAm201 10

01

1000

ΔtS msm2

HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 7: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Liquid nitrogenLiquid nitrogen temperature SMBI temperature SMBI Supersonic molecular beam injection (SMBI) system with gas pressure of

02~30 MPa and LN temperature

A cluster contains about 250 hydrogen atoms (in average) at pressure of 10 MPa in this measurements

The cold molecular beam (LN temperature) can penetrate into plasma deeply

The MBI with clusters may be of benefit for deeper fuelling LHYao et al this conf EXP3-21

P0 bar

SRS au

SRS~P014

center edge

Room TempLN Temp

SRS intensity of Rayleigh scattering

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Penetration depth scaling of SMBIPenetration depth scaling of SMBI The penetration depth is studied with FFT

analysis of modulated injection and tangential H-alpha array to detect the penetration depth

The penetration depth (working gas is at room temperature) is dependent on the plasma parameters and pressure of working gas

Asymmetric penetration using SMBI is observed in low density ( ~1times1019m-3) by ECE and soft X- ray The penetration depth is about 30 cm from the low field side (LFS) and only about 10 cm from the high field side (HFS)

306020 PTNCd ee

Amplitude

Phase

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Particle transport analysis with modulated MBIParticle transport analysis with modulated MBI

Particle transport is studied with modulated SMBI and microwave reflectometer

After the FFT the amplitude and the phase profiles of the first harmonic and high harmonics can be obtained

2)(2 D

Formula used

The particle diffusion coefficient on the Ohmic discharge is about 05 ~ 15m2s at ra = 06 ~ 075

It is about 14 of the electron heat diffusivity

0

1

2

3

4

5

25 27 29 31 33 35 37

fi rst harmoni c2nd harmoni cthi rd harmoni c

D(m2t)

r (cm)

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (1) Study of toroidal symmetry of GAM ZFs (1)

A novel design of three-step Langmuir probes is developed for ZF detection

The radial component of electric field and gradient of Er

The poloidal and toroidal coherencies of electric potential can be calculated using Φ1~Φ6 and Φ1~Φ11 respectively

rE fffr )2)(( 3211 232541 )2)(( rrE fffffr

]|)(|)()([)()(ˆ 233

221

233

2 ffvfvfBfb fr

)()()()( 213

3212

3 ffffvfvfB fr

Bdv ffr )( 31 BEv r 1

225

θ 65cmd

T PB I

Toroidal

Poloidal

Radial

40mmr

θ2 70mm θ1 45mm

Poloidal

12

3

4

5

67

8

9

10

1112

13

14

15

A

B

C

To explore the generation mechanism of the GAM ZFs squared cross-bicoherence is calculated

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (2) Study of toroidal symmetry of GAM ZFs (2) Toroidal symmetry (n ~ 0) of the GAM zonal

flow in a tokamak is identified for the first time

3-D spatial features of the GAM ZFs are analyzed simultaneously

Nonlinear three wave coupling is identified to be a plausible physical mechanism for the generation of the GAM ZFs

Studies of interactions between the ZFs and the ambient turbulences are in progress

KJZhao et al Physical Review Letters 96 (2006) 255004

LWYan et al this conf EXP4-35

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Confinement improvement after pelIet injectionConfinement improvement after pelIet injection

0

1 0 0

2 0 0

3 0 0

4 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashI(kA)

0

3

6

9

1 2

1 5

1 8

mdashVp(V)

0

1 5

3 0

4 5

6 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashne(10

12cm

-3)

0

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0 t ( m s )

mdashTe(au

)r=1cm

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

mdashTe(au

)r=35cm

0

0 0 4

0 0 8

0 1 2

0 1 6

0 2

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashVUV(a

u)

0

0 5

1

1 5

2

2 5

3

mdashBoL_

01(au)

0

0 0 6

0 1 2

0 1 8

0 2 4

0 3

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashβ

0

0 2

0 4

0 6

0 8

mdashτ

-50 -40 -30 -20 -10 0 10 20 30 40-50

0

50

100

150

200

250

300

r (cm)

Te

(au

)

shot4050

t=700mst=710mst=750mst=800ms

The q profile is reconstructed with TRANSP code using experimental data

The weak magnetic shear is achieved after PI

The improved confinement sustains about 500 ms

bull XTDing et al Chin Phys Lett Vol23 (2006) 2502

0

2

4

6

8

10

12

14

300 700 1100 1500 1900

r=202mm

r=238mm

Χ e m2s-1

t ms

Three pellets are injected during this time TeTi ~ 1

TeTi ~ 15

χe in plasma peripheral decreases after PI

Evidence of confinement time dependence of TeTi is observed

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Al and Ti are injected into plasma using laser blow-off

the transport of impurity in plasma center is slower than that in the outer region

The transient asymmetric profile inward transport and outward diffusion are observed using tomography of the soft X ray radiation

D 05 ~ 10 m2s V 1 ~10 ms at 02 lt ra lt 08

Investigation of impurity transport with LBOInvestigation of impurity transport with LBO

bull ZYCui YHuang PSun et al Chin Phys Lett Vol23 (2006) 2143

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Most of the plasma current quench time is 4~6 ms in the major disruptions

The induced loop-voltage is proportional to the current quench rate

The disruption regime in the dIP0S~tqS plane is identified

A new parameter is introduced to predict disruption The physical meaning of this parameter is the amplitude multiplies the period of MHD perturbation

The disruption mitigation by noble gas (Neon and Argon) puffing are demonstrated

Statistic analysis of disruptionStatistic analysis of disruption

dtB ~

JP0 MAm201 10

01

1000

ΔtS msm2

HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 8: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Penetration depth scaling of SMBIPenetration depth scaling of SMBI The penetration depth is studied with FFT

analysis of modulated injection and tangential H-alpha array to detect the penetration depth

The penetration depth (working gas is at room temperature) is dependent on the plasma parameters and pressure of working gas

Asymmetric penetration using SMBI is observed in low density ( ~1times1019m-3) by ECE and soft X- ray The penetration depth is about 30 cm from the low field side (LFS) and only about 10 cm from the high field side (HFS)

306020 PTNCd ee

Amplitude

Phase

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Particle transport analysis with modulated MBIParticle transport analysis with modulated MBI

Particle transport is studied with modulated SMBI and microwave reflectometer

After the FFT the amplitude and the phase profiles of the first harmonic and high harmonics can be obtained

2)(2 D

Formula used

The particle diffusion coefficient on the Ohmic discharge is about 05 ~ 15m2s at ra = 06 ~ 075

It is about 14 of the electron heat diffusivity

0

1

2

3

4

5

25 27 29 31 33 35 37

fi rst harmoni c2nd harmoni cthi rd harmoni c

D(m2t)

r (cm)

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (1) Study of toroidal symmetry of GAM ZFs (1)

A novel design of three-step Langmuir probes is developed for ZF detection

The radial component of electric field and gradient of Er

The poloidal and toroidal coherencies of electric potential can be calculated using Φ1~Φ6 and Φ1~Φ11 respectively

rE fffr )2)(( 3211 232541 )2)(( rrE fffffr

]|)(|)()([)()(ˆ 233

221

233

2 ffvfvfBfb fr

)()()()( 213

3212

3 ffffvfvfB fr

Bdv ffr )( 31 BEv r 1

225

θ 65cmd

T PB I

Toroidal

Poloidal

Radial

40mmr

θ2 70mm θ1 45mm

Poloidal

12

3

4

5

67

8

9

10

1112

13

14

15

A

B

C

To explore the generation mechanism of the GAM ZFs squared cross-bicoherence is calculated

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (2) Study of toroidal symmetry of GAM ZFs (2) Toroidal symmetry (n ~ 0) of the GAM zonal

flow in a tokamak is identified for the first time

3-D spatial features of the GAM ZFs are analyzed simultaneously

Nonlinear three wave coupling is identified to be a plausible physical mechanism for the generation of the GAM ZFs

Studies of interactions between the ZFs and the ambient turbulences are in progress

KJZhao et al Physical Review Letters 96 (2006) 255004

LWYan et al this conf EXP4-35

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Confinement improvement after pelIet injectionConfinement improvement after pelIet injection

0

1 0 0

2 0 0

3 0 0

4 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashI(kA)

0

3

6

9

1 2

1 5

1 8

mdashVp(V)

0

1 5

3 0

4 5

6 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashne(10

12cm

-3)

0

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0 t ( m s )

mdashTe(au

)r=1cm

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

mdashTe(au

)r=35cm

0

0 0 4

0 0 8

0 1 2

0 1 6

0 2

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashVUV(a

u)

0

0 5

1

1 5

2

2 5

3

mdashBoL_

01(au)

0

0 0 6

0 1 2

0 1 8

0 2 4

0 3

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashβ

0

0 2

0 4

0 6

0 8

mdashτ

-50 -40 -30 -20 -10 0 10 20 30 40-50

0

50

100

150

200

250

300

r (cm)

Te

(au

)

shot4050

t=700mst=710mst=750mst=800ms

The q profile is reconstructed with TRANSP code using experimental data

The weak magnetic shear is achieved after PI

The improved confinement sustains about 500 ms

bull XTDing et al Chin Phys Lett Vol23 (2006) 2502

0

2

4

6

8

10

12

14

300 700 1100 1500 1900

r=202mm

r=238mm

Χ e m2s-1

t ms

Three pellets are injected during this time TeTi ~ 1

TeTi ~ 15

χe in plasma peripheral decreases after PI

Evidence of confinement time dependence of TeTi is observed

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Al and Ti are injected into plasma using laser blow-off

the transport of impurity in plasma center is slower than that in the outer region

The transient asymmetric profile inward transport and outward diffusion are observed using tomography of the soft X ray radiation

D 05 ~ 10 m2s V 1 ~10 ms at 02 lt ra lt 08

Investigation of impurity transport with LBOInvestigation of impurity transport with LBO

bull ZYCui YHuang PSun et al Chin Phys Lett Vol23 (2006) 2143

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Most of the plasma current quench time is 4~6 ms in the major disruptions

The induced loop-voltage is proportional to the current quench rate

The disruption regime in the dIP0S~tqS plane is identified

A new parameter is introduced to predict disruption The physical meaning of this parameter is the amplitude multiplies the period of MHD perturbation

The disruption mitigation by noble gas (Neon and Argon) puffing are demonstrated

Statistic analysis of disruptionStatistic analysis of disruption

dtB ~

JP0 MAm201 10

01

1000

ΔtS msm2

HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 9: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Particle transport analysis with modulated MBIParticle transport analysis with modulated MBI

Particle transport is studied with modulated SMBI and microwave reflectometer

After the FFT the amplitude and the phase profiles of the first harmonic and high harmonics can be obtained

2)(2 D

Formula used

The particle diffusion coefficient on the Ohmic discharge is about 05 ~ 15m2s at ra = 06 ~ 075

It is about 14 of the electron heat diffusivity

0

1

2

3

4

5

25 27 29 31 33 35 37

fi rst harmoni c2nd harmoni cthi rd harmoni c

D(m2t)

r (cm)

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (1) Study of toroidal symmetry of GAM ZFs (1)

A novel design of three-step Langmuir probes is developed for ZF detection

The radial component of electric field and gradient of Er

The poloidal and toroidal coherencies of electric potential can be calculated using Φ1~Φ6 and Φ1~Φ11 respectively

rE fffr )2)(( 3211 232541 )2)(( rrE fffffr

]|)(|)()([)()(ˆ 233

221

233

2 ffvfvfBfb fr

)()()()( 213

3212

3 ffffvfvfB fr

Bdv ffr )( 31 BEv r 1

225

θ 65cmd

T PB I

Toroidal

Poloidal

Radial

40mmr

θ2 70mm θ1 45mm

Poloidal

12

3

4

5

67

8

9

10

1112

13

14

15

A

B

C

To explore the generation mechanism of the GAM ZFs squared cross-bicoherence is calculated

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (2) Study of toroidal symmetry of GAM ZFs (2) Toroidal symmetry (n ~ 0) of the GAM zonal

flow in a tokamak is identified for the first time

3-D spatial features of the GAM ZFs are analyzed simultaneously

Nonlinear three wave coupling is identified to be a plausible physical mechanism for the generation of the GAM ZFs

Studies of interactions between the ZFs and the ambient turbulences are in progress

KJZhao et al Physical Review Letters 96 (2006) 255004

LWYan et al this conf EXP4-35

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Confinement improvement after pelIet injectionConfinement improvement after pelIet injection

0

1 0 0

2 0 0

3 0 0

4 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashI(kA)

0

3

6

9

1 2

1 5

1 8

mdashVp(V)

0

1 5

3 0

4 5

6 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashne(10

12cm

-3)

0

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0 t ( m s )

mdashTe(au

)r=1cm

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

mdashTe(au

)r=35cm

0

0 0 4

0 0 8

0 1 2

0 1 6

0 2

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashVUV(a

u)

0

0 5

1

1 5

2

2 5

3

mdashBoL_

01(au)

0

0 0 6

0 1 2

0 1 8

0 2 4

0 3

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashβ

0

0 2

0 4

0 6

0 8

mdashτ

-50 -40 -30 -20 -10 0 10 20 30 40-50

0

50

100

150

200

250

300

r (cm)

Te

(au

)

shot4050

t=700mst=710mst=750mst=800ms

The q profile is reconstructed with TRANSP code using experimental data

The weak magnetic shear is achieved after PI

The improved confinement sustains about 500 ms

bull XTDing et al Chin Phys Lett Vol23 (2006) 2502

0

2

4

6

8

10

12

14

300 700 1100 1500 1900

r=202mm

r=238mm

Χ e m2s-1

t ms

Three pellets are injected during this time TeTi ~ 1

TeTi ~ 15

χe in plasma peripheral decreases after PI

Evidence of confinement time dependence of TeTi is observed

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Al and Ti are injected into plasma using laser blow-off

the transport of impurity in plasma center is slower than that in the outer region

The transient asymmetric profile inward transport and outward diffusion are observed using tomography of the soft X ray radiation

D 05 ~ 10 m2s V 1 ~10 ms at 02 lt ra lt 08

Investigation of impurity transport with LBOInvestigation of impurity transport with LBO

bull ZYCui YHuang PSun et al Chin Phys Lett Vol23 (2006) 2143

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Most of the plasma current quench time is 4~6 ms in the major disruptions

The induced loop-voltage is proportional to the current quench rate

The disruption regime in the dIP0S~tqS plane is identified

A new parameter is introduced to predict disruption The physical meaning of this parameter is the amplitude multiplies the period of MHD perturbation

The disruption mitigation by noble gas (Neon and Argon) puffing are demonstrated

Statistic analysis of disruptionStatistic analysis of disruption

dtB ~

JP0 MAm201 10

01

1000

ΔtS msm2

HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 10: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (1) Study of toroidal symmetry of GAM ZFs (1)

A novel design of three-step Langmuir probes is developed for ZF detection

The radial component of electric field and gradient of Er

The poloidal and toroidal coherencies of electric potential can be calculated using Φ1~Φ6 and Φ1~Φ11 respectively

rE fffr )2)(( 3211 232541 )2)(( rrE fffffr

]|)(|)()([)()(ˆ 233

221

233

2 ffvfvfBfb fr

)()()()( 213

3212

3 ffffvfvfB fr

Bdv ffr )( 31 BEv r 1

225

θ 65cmd

T PB I

Toroidal

Poloidal

Radial

40mmr

θ2 70mm θ1 45mm

Poloidal

12

3

4

5

67

8

9

10

1112

13

14

15

A

B

C

To explore the generation mechanism of the GAM ZFs squared cross-bicoherence is calculated

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (2) Study of toroidal symmetry of GAM ZFs (2) Toroidal symmetry (n ~ 0) of the GAM zonal

flow in a tokamak is identified for the first time

3-D spatial features of the GAM ZFs are analyzed simultaneously

Nonlinear three wave coupling is identified to be a plausible physical mechanism for the generation of the GAM ZFs

Studies of interactions between the ZFs and the ambient turbulences are in progress

KJZhao et al Physical Review Letters 96 (2006) 255004

LWYan et al this conf EXP4-35

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Confinement improvement after pelIet injectionConfinement improvement after pelIet injection

0

1 0 0

2 0 0

3 0 0

4 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashI(kA)

0

3

6

9

1 2

1 5

1 8

mdashVp(V)

0

1 5

3 0

4 5

6 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashne(10

12cm

-3)

0

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0 t ( m s )

mdashTe(au

)r=1cm

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

mdashTe(au

)r=35cm

0

0 0 4

0 0 8

0 1 2

0 1 6

0 2

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashVUV(a

u)

0

0 5

1

1 5

2

2 5

3

mdashBoL_

01(au)

0

0 0 6

0 1 2

0 1 8

0 2 4

0 3

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashβ

0

0 2

0 4

0 6

0 8

mdashτ

-50 -40 -30 -20 -10 0 10 20 30 40-50

0

50

100

150

200

250

300

r (cm)

Te

(au

)

shot4050

t=700mst=710mst=750mst=800ms

The q profile is reconstructed with TRANSP code using experimental data

The weak magnetic shear is achieved after PI

The improved confinement sustains about 500 ms

bull XTDing et al Chin Phys Lett Vol23 (2006) 2502

0

2

4

6

8

10

12

14

300 700 1100 1500 1900

r=202mm

r=238mm

Χ e m2s-1

t ms

Three pellets are injected during this time TeTi ~ 1

TeTi ~ 15

χe in plasma peripheral decreases after PI

Evidence of confinement time dependence of TeTi is observed

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Al and Ti are injected into plasma using laser blow-off

the transport of impurity in plasma center is slower than that in the outer region

The transient asymmetric profile inward transport and outward diffusion are observed using tomography of the soft X ray radiation

D 05 ~ 10 m2s V 1 ~10 ms at 02 lt ra lt 08

Investigation of impurity transport with LBOInvestigation of impurity transport with LBO

bull ZYCui YHuang PSun et al Chin Phys Lett Vol23 (2006) 2143

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Most of the plasma current quench time is 4~6 ms in the major disruptions

The induced loop-voltage is proportional to the current quench rate

The disruption regime in the dIP0S~tqS plane is identified

A new parameter is introduced to predict disruption The physical meaning of this parameter is the amplitude multiplies the period of MHD perturbation

The disruption mitigation by noble gas (Neon and Argon) puffing are demonstrated

Statistic analysis of disruptionStatistic analysis of disruption

dtB ~

JP0 MAm201 10

01

1000

ΔtS msm2

HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 11: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Study of toroidal symmetry of GAM ZFs (2) Study of toroidal symmetry of GAM ZFs (2) Toroidal symmetry (n ~ 0) of the GAM zonal

flow in a tokamak is identified for the first time

3-D spatial features of the GAM ZFs are analyzed simultaneously

Nonlinear three wave coupling is identified to be a plausible physical mechanism for the generation of the GAM ZFs

Studies of interactions between the ZFs and the ambient turbulences are in progress

KJZhao et al Physical Review Letters 96 (2006) 255004

LWYan et al this conf EXP4-35

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Confinement improvement after pelIet injectionConfinement improvement after pelIet injection

0

1 0 0

2 0 0

3 0 0

4 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashI(kA)

0

3

6

9

1 2

1 5

1 8

mdashVp(V)

0

1 5

3 0

4 5

6 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashne(10

12cm

-3)

0

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0 t ( m s )

mdashTe(au

)r=1cm

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

mdashTe(au

)r=35cm

0

0 0 4

0 0 8

0 1 2

0 1 6

0 2

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashVUV(a

u)

0

0 5

1

1 5

2

2 5

3

mdashBoL_

01(au)

0

0 0 6

0 1 2

0 1 8

0 2 4

0 3

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashβ

0

0 2

0 4

0 6

0 8

mdashτ

-50 -40 -30 -20 -10 0 10 20 30 40-50

0

50

100

150

200

250

300

r (cm)

Te

(au

)

shot4050

t=700mst=710mst=750mst=800ms

The q profile is reconstructed with TRANSP code using experimental data

The weak magnetic shear is achieved after PI

The improved confinement sustains about 500 ms

bull XTDing et al Chin Phys Lett Vol23 (2006) 2502

0

2

4

6

8

10

12

14

300 700 1100 1500 1900

r=202mm

r=238mm

Χ e m2s-1

t ms

Three pellets are injected during this time TeTi ~ 1

TeTi ~ 15

χe in plasma peripheral decreases after PI

Evidence of confinement time dependence of TeTi is observed

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Al and Ti are injected into plasma using laser blow-off

the transport of impurity in plasma center is slower than that in the outer region

The transient asymmetric profile inward transport and outward diffusion are observed using tomography of the soft X ray radiation

D 05 ~ 10 m2s V 1 ~10 ms at 02 lt ra lt 08

Investigation of impurity transport with LBOInvestigation of impurity transport with LBO

bull ZYCui YHuang PSun et al Chin Phys Lett Vol23 (2006) 2143

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Most of the plasma current quench time is 4~6 ms in the major disruptions

The induced loop-voltage is proportional to the current quench rate

The disruption regime in the dIP0S~tqS plane is identified

A new parameter is introduced to predict disruption The physical meaning of this parameter is the amplitude multiplies the period of MHD perturbation

The disruption mitigation by noble gas (Neon and Argon) puffing are demonstrated

Statistic analysis of disruptionStatistic analysis of disruption

dtB ~

JP0 MAm201 10

01

1000

ΔtS msm2

HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 12: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Confinement improvement after pelIet injectionConfinement improvement after pelIet injection

0

1 0 0

2 0 0

3 0 0

4 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashI(kA)

0

3

6

9

1 2

1 5

1 8

mdashVp(V)

0

1 5

3 0

4 5

6 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashne(10

12cm

-3)

0

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0 t ( m s )

mdashTe(au

)r=1cm

0

2 0 0

4 0 0

6 0 0

8 0 0

1 0 0 0

1 2 0 0

mdashTe(au

)r=35cm

0

0 0 4

0 0 8

0 1 2

0 1 6

0 2

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashVUV(a

u)

0

0 5

1

1 5

2

2 5

3

mdashBoL_

01(au)

0

0 0 6

0 1 2

0 1 8

0 2 4

0 3

0 4 0 0 8 0 0 1 2 0 0 1 6 0 0 2 0 0 0t ( m s )

mdashβ

0

0 2

0 4

0 6

0 8

mdashτ

-50 -40 -30 -20 -10 0 10 20 30 40-50

0

50

100

150

200

250

300

r (cm)

Te

(au

)

shot4050

t=700mst=710mst=750mst=800ms

The q profile is reconstructed with TRANSP code using experimental data

The weak magnetic shear is achieved after PI

The improved confinement sustains about 500 ms

bull XTDing et al Chin Phys Lett Vol23 (2006) 2502

0

2

4

6

8

10

12

14

300 700 1100 1500 1900

r=202mm

r=238mm

Χ e m2s-1

t ms

Three pellets are injected during this time TeTi ~ 1

TeTi ~ 15

χe in plasma peripheral decreases after PI

Evidence of confinement time dependence of TeTi is observed

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Al and Ti are injected into plasma using laser blow-off

the transport of impurity in plasma center is slower than that in the outer region

The transient asymmetric profile inward transport and outward diffusion are observed using tomography of the soft X ray radiation

D 05 ~ 10 m2s V 1 ~10 ms at 02 lt ra lt 08

Investigation of impurity transport with LBOInvestigation of impurity transport with LBO

bull ZYCui YHuang PSun et al Chin Phys Lett Vol23 (2006) 2143

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Most of the plasma current quench time is 4~6 ms in the major disruptions

The induced loop-voltage is proportional to the current quench rate

The disruption regime in the dIP0S~tqS plane is identified

A new parameter is introduced to predict disruption The physical meaning of this parameter is the amplitude multiplies the period of MHD perturbation

The disruption mitigation by noble gas (Neon and Argon) puffing are demonstrated

Statistic analysis of disruptionStatistic analysis of disruption

dtB ~

JP0 MAm201 10

01

1000

ΔtS msm2

HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 13: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Al and Ti are injected into plasma using laser blow-off

the transport of impurity in plasma center is slower than that in the outer region

The transient asymmetric profile inward transport and outward diffusion are observed using tomography of the soft X ray radiation

D 05 ~ 10 m2s V 1 ~10 ms at 02 lt ra lt 08

Investigation of impurity transport with LBOInvestigation of impurity transport with LBO

bull ZYCui YHuang PSun et al Chin Phys Lett Vol23 (2006) 2143

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Most of the plasma current quench time is 4~6 ms in the major disruptions

The induced loop-voltage is proportional to the current quench rate

The disruption regime in the dIP0S~tqS plane is identified

A new parameter is introduced to predict disruption The physical meaning of this parameter is the amplitude multiplies the period of MHD perturbation

The disruption mitigation by noble gas (Neon and Argon) puffing are demonstrated

Statistic analysis of disruptionStatistic analysis of disruption

dtB ~

JP0 MAm201 10

01

1000

ΔtS msm2

HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 14: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Most of the plasma current quench time is 4~6 ms in the major disruptions

The induced loop-voltage is proportional to the current quench rate

The disruption regime in the dIP0S~tqS plane is identified

A new parameter is introduced to predict disruption The physical meaning of this parameter is the amplitude multiplies the period of MHD perturbation

The disruption mitigation by noble gas (Neon and Argon) puffing are demonstrated

Statistic analysis of disruptionStatistic analysis of disruption

dtB ~

JP0 MAm201 10

01

1000

ΔtS msm2

HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 15: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

The saturated sawtooth and strong m = 1 precursor is found during on-axis ECRH

The period of sawtooth decreases during on-axis ECRH discharges

The heat transport increases in on-axis ECRH discharges

Sawtooth behaviours in ECRH experimentSawtooth behaviours in ECRH experiment

bull Yi Liu et al this conf EXP8-13

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 16: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI)

This m = 1 mode is detected by soft X ray arrays but not detected by Mirnov coils

An m = 2 magnetic perturbation with the same frequency is observed during the decay of m = 1 mode

Coupling between m = 1 and m = 2 oscillationCoupling between m = 1 and m = 2 oscillation

Snake

m = 1m = 1

m = 2m = 2 Mirnov

SX04

SX07

SX10

1650 1850t ms

SX13

SX15

SX13 SX15

Freq kHz

10

0

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 17: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

In experiment the phenomenon similar to the partially detached divertor regime is observed with ne = 15times1019m-3 in main plasma

Numerical analysis of HL-2A divertor discharges is done using SOLPS 50 code

It is the linear regime at ne le 05times1019m-3Detached phenomenon appears at 2times1019m-3 le ne le 3times1019m-3

The reason for the easy detachment may be the long divertor legs and thin divertor throats

Detached divertor is observedDetached divertor is observed

ne = 05times1019m-3 ne = 25times1019m-3 ne = 30times1019m-3

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 18: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (1)Summary and future plan (1) The detailed investigations of SMBI are carried out A penetration depth scaling

is revealed The LNT SMBI can penetrate into plasma more deep The MBI with clusters may be of benefit for deeper fuelling The penetration depth of SMBI is much deeper in LFS than in HFS at low density discharges

The particle diffusion coefficient is about 05~15m2s in plasma peripheral region using microwave reflectometer and modulated SMBI

3-D features of GAM ZFs are determined with novel designed 3-step Langmuir probes The symmetries (m=0~1 n = 0) of the directly measured low frequency (7~9 kHz) electric potential and field are simultaneously observed

The diffusion coefficient D and convection velocity V of impurity are fitted using LBO D = 05~10 m2s V = 1 ~ 10 ms

A new parameter is introduced to predict the disruption The noble gas injection successfully increase the current quench time from 5 ms to longer than 20 ms

A large persistent m = 1 perturbation of snake structure is observed in sawtooth free plasma after PI (or SMBI) An m = 2 magnetic perturbation with the same frequency is induced by the m = 1 mode

The detached (or partially detached) divertor regime is easily occurrence even in the intermediate density operation The reason may be the long divertor legs and thin divertor throats The numerical simulations are in good agreement with the experiments

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 19: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

Summary and future plan (2)Summary and future plan (2)bull H - mode operation and physicsH - mode operation and physics

bull Realizing the H-mode discharge by ECRHRealizing the H-mode discharge by ECRHbull Pedestal physics studiesPedestal physics studies

bull High Beta operationHigh Beta operationbull Confinement Confinement bull Impurity particle transport thermal transportImpurity particle transport thermal transportbull Synergy of ECCD amp LHCD Synergy of ECCD amp LHCD using 2 MW ECCD and 1MW LHCDusing 2 MW ECCD and 1MW LHCD

bull Disruption controlDisruption control bull Disruption prediction Disruption mitigationDisruption prediction Disruption mitigation by SMBI by SMBI

bull Zonal flowsZonal flows studies of low-frequency ZFsstudies of low-frequency ZFs

bull MHD instabilitiesMHD instabilitiesbull Seed islandsawteeth controlSeed islandsawteeth controlbull Mode coupling studiesMode coupling studiesbull Investigation of ELMs in H-mode dischargesInvestigation of ELMs in H-mode discharges

bull Divertor physicsDivertor physics

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention

Page 20: Overview of HL-2A Experiment Results, OV/4-1 Overview of HL-2A Experiment Results SouthWestern Institute of Physics, Chengdu, China Qingwei YANG for HL-2A

Overview of HL-2A Experiment Results Overview of HL-2A Experiment Results OV4-1OV4-1

ThanksThanksfor your attentionfor your attention