Status of H-mode confinement Database by K. Thomsen, Lausanne, May 2007
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Status of H-mode confinement Databaseby K. Thomsen, Lausanne, May 2007
New preliminary version DB4v4 (12100 obs) - New data from AUG, DIII-D, JET, JT-60U, NSTX- Hybrid data marked with new variable HYBRID (=yes)- Other new variables: OJK2006, RHOINV, TAUCR, FBS, WROT, RHOQ2, ITB, ITBTYPE
Corrections have been received from AUG, JET, JT-60U. Only JT-60U has released FBS and RHOQ2 data Other problems has been identified by A.Chudnovskiy. Hybrid datasets from AUG, DIII-D and JET are
preliminary versions. Notice PHASE=HGELM? OJK2006 will be set in the next release NF paper on DB3 has been published
Nucl. Fusion 47 (2007) 147-174. Well done Darren!!!
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Analyses
New scaling expression(s) from Otto Kardaunas presented yesterday
We need to establish an action plan for the paper based on Otto’s analyses
Analyses of the Hybrid data in DB4v4- KT no time due to other commitments- Any other?- Can we do some analyses at this meeting?- Action plan
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Version DB4 compared to DB3
New data from NSTX New data from JET New data from DIII-D New data from MAST New data from AUG New data from JT-60U
Data descriptions outstanding on the new data Review Sheets
Pedestal data?
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Web page with documentation and access to different formats of the Db4v4 database http://efdasql.ipp.mpg.de/igd/ITER/DataInfo/Db4v3/DB4v4.htm
DB4v3 is combined w. Pedestal DB DB3v3 (HDB4v3_PDB3v3)
Review sheets for all data in DB4v3
New List of Variables
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Action List from Chengdu
Combine hybrid data with DB4v3 + new AUG dataAUG, DIII-D and JET data before 1st DecemberJT-60U and NSTX data before 1st January – Done(late)
Data values for the new ‘hybrid’ variables to be collectedr/a(q=2), taucr, fBS, Rinv - (taucr and Rinv calc. Only JT-60U has provided r/a(q=2) and FBS)
Analyse Hybrid data H-mode WS contribution (KT) – not yet
Work on OK’s analysis paper ( and EPS?) – in progress
Work together with pedestal group to improve scalar pedestal db with hybrid data new two term scaling analysis – no progress
Comments on Issue Cards as required – none so far
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Data submission List as promised in Chengdu
AUG: Hybrid dataset - DONE FR C-Mod: ?? DIII-D: Hybrid dataset - DONE JD JET: Hybrid dataset - DONE
DM JFT-2M: ?? JT-60U: Hybrid dataset - DONE HT
Beta scaling data - ? TT
TCV: ?? MAST: ?? NSTX: IP, BT and beta scan data - DONE SK Others ??
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Comments from Alexander Chudnovskiy on DB4v4
Comments on results of comparison1. There is TYP-I-II among ELMTYP types.
This type is not described in the List of variables. The variable list includes TYPE-II but it is absent in DB4v4.
2. There is O1 among ECHMOD types. It is not described in the List of variables. The variable list includes O but it is absent in DB4v4.
Remarks on parameters values.1. The PGASA for 2 JET shots 46004 and 46005 is equal to 14.01 in
both DB4v4 and DB3v13.2. The BETMHD values for NSTX shots from 115495 to 117995 are
in the range from 5 to 35. They are probably given in percents.3. A lot of AUG shots have to high NE0 values.
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Hybrid definition
1. Define baseline ITER scenario with aims
2. Create candidate modes on present toks
3. See if they scale to baseline
Definition:
• Steady, low central (x=0-0.5) shear q-profile (tdur > 1-2 tauCR)
• steady state w. ELMs for tdur >> tauE,
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Hybrid characterisation
• Confinement scaling v tau98(y,2)…
• Residuals v. H98(y,2) for new fraction
• Correlation study
• Bootstrap fraction
Extra variables: fBS, rho(q=2), TauCR, inversion radius, ITB flag
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Analysis of Hybrid data
Tauth against tau98y2 ☺, rhostar ☺, nustar ☺ Li vs betaN Nustar vs rhostar ☺ Get db2p8 of db4v3 ☺ Fbs vs q95 Ip vs Bt ☺ Tauth vs nel ☺ Wth vs plth H98y2 vs tauth ☺,nel ☺, plth ☺, rhostar ☺, nustar ☺ JT-60U hybrid data ☺
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Correlations in Hybrid dataset
B,I: AUG has good coverage, JET has fixed q95 but a I range, DIII-D at fixed B,I
nu*,rho*: good rho* spread, less so in nu*. AUG has some big outliers due to high density discharges
AUG, DIII-D, JET
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Fit of confinement to IPB98(y,2)
JET seems to follow IPB98(y,2) with H=1.
Both AUG and DIII-D have improved confinement with the bulk of the data with H=1-1.7. H clearly increases with tauE, so has a different scaling
AUG, DIII-D, JET
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Residual trend with density and power
Density and power scalings on DIII-D are very different to 98(y,2). JET shows no residual, AUG may follow either trend
One concern is the narrow spread of data in DIII-D
AUG, DIII-D, JET
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Trend with rho* and nu*
•Strongest correlation seems to be residual H scaling with rho*
•This would not be good for ITER
•May be due to strong rho*-BetaNth correlation, but may be real (q95~4 had more Bohm-like scaling in ELMy H-mode rho* scan)
AUG, DIII-D, JET
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