M. von Hellermann Progress and Status of Active Beam Spectroscopy for ITER Manfred von Hellermann...

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Progress and Status ofActive Beam Spectroscopy for ITER

Manfred von Hellermann

10th ITPA diagnostic MeetingKurchatov, Moscow, TRINTI Troitsk

April 10 -14, 2006

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Acknowledgements

FOM / FZJ : Serge Brons, Roger Jaspers,

Olaf Neubauer, Andrey Litnovsky,

Michael Pap

ITER/ IT: Chris Walker, Christian Ingesson, Robin

Barnsley, George Vayakis

Kurchatov: Alexey Gorshkov, Konstantin Vukolov

TNO: Willem Vliegenthart, Kees Moddemeijer

TRINITI: Sergei Tugarinov

UKAEA : Nick Hawkes, Bob Walton, Cliff Marren

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Performance ReviewDNB IssuesPeriscope developmentRadial overlap issuesPort swap Mirror developmentMaintenance IssuesCXRS Pilot Experiment on TextorShared Software Development (EU,RF,US)

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Performance Studiesreviewed…..

EU EFDA contracts 2005EU/RF CXRS Meeting 2005Shared Pilot Experiment 2006

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Performance requirements

1) signal-to-noisea) detection efficiency and instrumentationb) energy dependence for beam stopping and

emission rates2) spatial resolution

a)measurement requirement tableb)overlap of upper and equatorial port viewsc) magnetic field measurements

3) minimisation of blanket cutsa) neutron reductionb) steerability

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plasmaAplasma = spectrometer Aspectrometer

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spspb

sol

zz

dd

AndsQn

I

..

2

20

4

1

)(exp

1)(

CX spectral intensity

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2

2

2

2

exp),,(yxyx

b w

y

w

x

vwwE

Pzyxn

Approximation of Gaussian DNB profile

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To: P.L.Mondino, E.Di Pietro, T.Inoue, A.Costley, V.Mukhovatov From: A.PanasenkovDate: October 27, 1999

Peak current density60mA/cm^2

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rTz

wrerf

BLgZe

cdrncI

N

S

obsde

perp

pffeff

zstopzzeCXn

2/

)/(

sin8

}exp{

)(

2

2

,

2/1

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Radial Resolution

Need for Upper and Equatorial periscopes

Poloidal and Toroidal Velocity Measurements

Upper Port 2

Upper Port 3

Radial Resolution for U-ports 2 and 3

a/20

a/30

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a/20

a/30

w-DNB=0.07m

a/20

a/30

w-DNB=0.07m

a/30

w-DNB=0.07m

a/30

w-DNB=0.07m

a/20E-port

U-port

Radial Resolution for Upper and Equatorial Port

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Beam Issues……

Beam divergenceModulation ??Duty CycleMaintenanceBlanket Cut

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Neutral beam stopping cross-sections

Effective CX Emission rates

0

5

10

15

20

25

30

35

20 40 60 80 100 120 140 160 180 200 220 240E(keV/amu)

Q(1

0-15

m-3

)

HeII

NeX

NVIICVI

BeIV

0

10

20

30

40

40 60 80 100 120 140 160 180 200Beam Energy (keV/amu)

Sign

al-t

o-no

ise

rati

o

He(4%)

C(1.2%)Be(2%)

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TECTilted DNB aimed at magnetic axis

Can blanket cut be reduced without loss of performance ?

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Positive ion source

Negative ion source

Energy(keV/amu) (80+/-10) (D0) (100+/-20)(H0)

Power(MW) 2.8 (full E) 2.2

Neutral Current (A) 16.6 (full E) 22

Species mix 0.85:0.08:0.07 1:0:0

Divergence(mrad) 4.3 5 (10)

Spot size (m) <0.07 <0.1 (0.3)

modulation desirable desirable

Duty cycle 1:4 1:4

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Pos. ion source Neg. ion source

stop(10-20m2) 2.63,4.16,5.32 2.28

Zeta (r/a=0.3) 0.016, 0.002, 0.0004

0.026

cx(HeII)(10-22m2) 3.77, 16.1, 15.9 1.89

cx(CVI)(10-22m2) 25.5, 35.6,17.9 16.02

cx(BeIV)(10-22m2) 14.4, 31.5,22.7 8.42

SNR(HeII) 18 12

SNR(CVI) 58 53

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Port plug allocation

Reference plug : Upper port 3

Alternative plug : Upper port 2

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Serge Brons, FZJAlexey Gorshkov, Kurchatov

Port 3

Port 2

2 legged optics and separate pipe with first mirror andshutter

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Intersections of lines-of-sight with blanket structure

Port plug 3 Port plug 2

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Retractable 3-pipe concept

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Graphical representation of the deflection in meters of the whole unit . The centre of the mirror is bend upward.

DeflectionAnalysis

FZJ

Michael Pap

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OPTICS

Recent studies at TNO DelftWillem VliegenthartKees Modemeijer

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Alternative Cassegrain configurationImaging of entire DNB path0<r/a<1

Courtesy TNO

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TNO 2005, Willem Vliegenthart

Cassegrain optics with improvedImaging qualities

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Proposed arrangement of fibre head24 radial channels along DNB5 fibres across (2w)

Core region:15 channels high resolution (<a/30)

Outer region:9 channels low resolution(<a/20)

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Inverse imaging of central 1mm fibre onto DNB, box scale 50 mm, preliminary design, courtesy TNO

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Alignment issues

1) Pre-alignment in assembly phase2) Alignment by rotation of mirror tubes3) Fine-alignment by fibre-holder adjustments

Alignment control1) Radial positions by BES Doppler shifts2) Height and angle with respect to DNB a) In vessel inspection (TV cameras) b) Use of 2-dim fibre array and maximisation of BES signal

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Measuring Capabilities of ITER Core CXRS

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MSE

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Uport 2

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Port 2

Port 3

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Upper port 2

Upper port 3

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Uport 2

ITER CXRS PILOT

EU:Roger Jaspers & Manfred von Hellermann

RF: Sergei Tugarinov

Pilote Experiment on TEXTOR

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High Throughput: F/3High Resolution: 2.5 Å/mm

TRINITI Spectrometer, S.Tugarinov

Aims1. Optimisation of spectral instruments and detectors

2. Sensitivity study for MSE and ratiometry for top port

2

2

cos1

sin

I

IP

Aims1. Optimisation of spectral instruments and detectors

2. Sensitivity study for MSE and ratiometry for top port

3. Multi-tasking set-up: MSE/BES/CXRS-D/He/C

s.o.l

bCX

CXz

dsnQ

I4n

CXBES

BESCX

e

z

QI

QI

n

n

CXRS: Ti , vpol,vtor, nz*nb

BES: nb, Pdep, MSE ( Bt, Bpol, q , Rmeas, Er.)

No absolute calibrations!!!!No absolute calibrations!!!!No absolute calibrations!!!!No absolute calibrations!!!!No absolute calibrations!!!!No absolute calibrations!!!!

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SummaryReview of first mirror position, mirror material,Mirror heating and coolingAllocation of CXRS/BES Upper portReview of opticsSpecification of fibre linkDesired overlap of Core and Edge CXRSUse of beam emission spectroscopyRadial resolution and incremental scansAlignment proceduresMagnetics :Total magnetic fields , pitch angles

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Summary, continuedMeasuring capabilityInstrumentationPilote experiment on TEXTOR