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ITPA – CDBM H-mode threshold database IAEA TM on H-mode paper October 2007 - Naka. Yves Martin Centre de Recherches en Physique des Plasmas Association Euratom - Confédération Suisse Ecole Polytechnique Fédérale de Lausanne (EPFL) CH - 1015 Lausanne, S witzerland. Preliminary remarks. - PowerPoint PPT Presentation
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Yves MartinYves Martin
Centre de Recherches en Physique des PlasmasAssociation Euratom - Confédération Suisse
Ecole Polytechnique Fédérale de Lausanne (EPFL)CH - 1015 Lausanne, Switzerland
ITPA – CDBMITPA – CDBMH-mode threshold databaseH-mode threshold database
IAEA TM on H-mode paperIAEA TM on H-mode paper
October 2007October 2007 - - NakaNaka
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 2
Preliminary remarksPreliminary remarks
Constraints• IAEA TM papers to be published in JPCS (J.Phys.:Conf.Ser.)• ~30 papers (half presented papers) submitted • Delay: Oct 12th
Plan• Improved but similar coverage version to JPCS• Extended version to PPCF
Comments• Received comments TT, JDB, R.Sartori, AP, FR, JS, YA
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 3
PlanPlan
Abstract / IntroductionThreshold power estimation
• DB status• Data selection• Power law scaling• Predictions for ITER
Effect of CHSIndividual density dependence
• Dependence in individual devices• Prediction for ITER
Density of the minimum threshold power• Search for minimum• Discussion
Access to an H-mode with good confinement properties• PoP in H-mode DB• High H factor close to threshold
Discussion - conclusion
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 4
Abstract / IntroductionAbstract / Introduction
Abstract• Too long
Introduction• Too long
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 5
Threshold power estimationThreshold power estimation
DB status
Data selection
Power law scaling
Predictions for ITER
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 6
DB statusDB status
New data
Changes in data
Distribution of data
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 7
Data selectionData selection
SELEC2007= If( :SELDBsum == 1111111111 & :PHASE_RED == "LH" & :AUXHEAT != "NONE" & :AUXHEAT != "EC" & :CONFIGs == "SN" & :PGASA == 2 & :KAPPA > 1.2 & :TOK != "NSTX" & !( :TOK == "JFT2M" & :NEL < 25000000000000000000) & !( :TOK == "JT60U" & :NEL < 15000000000000000000) & !( :TOK == "CMOD" & :PHASE == "D") & !( :TOK == "CMOD" & :PHASE == "DA") & !Is Missing( :NEL) & !Is Missing( :PLTH_MW),1, 0)
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 8
Data selection IIData selection II
SELDBsum = Summary of SELDBxxx where x=1,2,4v1,4v2 If(!Is Missing( :SELDB2) & :SELDB2 > 0,
:SELDB2, If(!Is Missing( :SELDB1) & :SELDB1 > 0,
:SELDB1, If(!Is Missing( :SELDB4v2) & :SELDB4v2 > 0,
:SELDB4v2, If(!Is Missing( :SELDB4v1)
& :SELDB4v1 > 0, :SELDB4v1, 0))))
CONFIGs = Simplified configuration "SNT", "SN", "SNB", "SN", "SN(L)", "SN",
"SNL", "SN", "SNU", "SN", "SN(U)", "SN"
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 9
Data selection IIIData selection III
PHASE_RED = Reduction of PHASED LH DA LH DH
LH EDA H EDAA H EDALHL H H HA H HCMP H
HELM H HELM? H HGELM HHGELMA H HGELMHA H HL
HL HOHM HL HSELM H HSELMA HHSElMA H HSELML HL HSELMOHM
HL L L LA L LA1 LLA2 L LA3 L LD
LH LDH LH LDHSELM LH LDL LLDSELM LH LH LH LHLHL
LH LHLHLA LH LHSELM LH OHA LOHM L OHMA L OHMD
LH OHMDH LH OHMDSELM LH OHMHLH OHMHSELM LH OHMP L OHMPDLH", :PHASE || " is missing")
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 10
Data selection IVData selection IV
Avoid low density region ? SELDB should do it
Ohmic H-mode in CMOD do not have higher threshold
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 11
Recommended scalingRecommended scaling
Scaled parameter: PLTH• Definition changed (PFLOSS included)
With a and R:Pthresh = 2.15 n0.782+/-0.037 B0.772+/-0.031 a0.975+/-0.08 R0.999+/-0.101
With S:Pthresh = 0.049 n0.717+/-0.035 B0.803+/-0.032 S0.941+/-0.019
Discuss Kadomtsev constraintDiscuss changes from earlier versions
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 12
Prediction for ITERPrediction for ITER
Specify: Predictions done for DD plasmas• Discuss DT predictions ?
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 13
Effect of CHSEffect of CHS
Generalize discussion to low aspect ratio toks?
0.1
1 0.7 0.5 0.3 0.2
10 6 4 3 2 PL
[MW]
.1 1 .8 .
6 .4 .
3 .2 10
7 5
4 3
2 PTHRESH [MW]
CHS
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 14
Individual density dependenceIndividual density dependence
Include a figure showing the non-alignement of individual devices
Density dependence on individual devices at well populated field values
Prediction for ITER
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 15
Dependence in individual devicesDependence in individual devices
Include uncertainties
Remove literature points• Keep as comment on
additional uncertainty?
Compare with OK work in Ryter 1996
JS not convinced by this effect
0.2
0.4
0.6
0.8
1
1.2
1.4
n
CMOCMOD
0 .1 .2 .3 .4 .5 .6 .7 .8 .9 1 1.1 a [m]
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 16
Prediction for ITERPrediction for ITER
Prediction with lowest RMS scaling (minor radius, open divertor for JT-60U): 135MW (at high density)
Include uncertainties
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 17
Density of the minimum threshold powerDensity of the minimum threshold power
Search for minimum for individual devices at well populated field values
Interpretation of global picture
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 18
Search for minimumSearch for minimum
Include examples (figure)
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 19
DiscussionDiscussion
Link between different density dependences and different minimum densities
Discuss neutral penetration / collisionality
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 20
Access to an H-mode with good confinement propertiesAccess to an H-mode with good confinement properties
PoP in H-mode DB for HSELM and HGELM
H factor vs PoP for HSELM and HGELM
Too weak
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 21
PoP in H-mode DBPoP in H-mode DB
Why PoP > 1 in most devices ?Why PoP < 1 in Alcator C-Mod ?
0
1
2
3
4
5
6
ASDEX
Upgrade
0
1
2
3
4
5
6
Alcator
C-mod
0
1
2
3
4
5
6
DIII-D
0
1
2
3
4
5
6
JET
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 22
0.5
0.7
0.9
1.1
1.3
1.5
1.7
H
0
1
2
3
4
5
6
7
8
PL/Pthresh
High H factor close to thresholdHigh H factor close to threshold
Correlation PHASE / ELM type:P
HA
SE HGELM
HSELM 31 28 1290 2 1
0 39 164 327 13
1352
543
31 67 1454 329 14 1895
ELMTYPE
Count TYP-I-II TYPE-? TYPE-I TYPE-III TYPE-RF ...
2291ts were included in the dataset (missing ELMTYPE data for ~400)
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 23
R.Sartori's commentR.Sartori's comment
Type I ELM H factor ~ 1 (by construction!)Type III ELM H factor = 0.8-0.9 x type I ELM H factor
@Threshold power (or just above): type III ELMs; more power to obtain type I ELMs
PtypeI = Y x Pthresh where 1.3<Y<2.5
Yves Martin, ITPA TG CDBM LH Transitions, October 2007, Naka 24
Discussion - conclusionDiscussion - conclusion