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ITPA – CDBM H-mode threshold database Threshold database status May 2007 - Lausanne

ITPA – CDBM H-mode threshold database Threshold database status May 2007 - Lausanne. Yves Martin Centre de Recherches en Physique des Plasmas Association Euratom - Confédération Suisse Ecole Polytechnique Fédérale de Lausanne (EPFL) CH - 1015 Lausanne, S witzerland.

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ITPA – CDBM H-mode threshold database Threshold database status May 2007 - Lausanne

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  1. ITPA – CDBMH-mode threshold databaseThreshold database statusMay 2007 - Lausanne Yves Martin Centre de Recherches en Physique des Plasmas Association Euratom - Confédération Suisse Ecole Polytechnique Fédérale de Lausanne (EPFL) CH - 1015 Lausanne, Switzerland

  2. Action list decided in Chengdu, October 2006 • New data • JFT-2M TT 30.11.06 • CHS TT 30.11.06 • NSTX SK 30.11.06 • MAST MV 30.11.06 • New version of DB (4v7) YM 31.12.06 • Recommended scaling • Confirm data selection (individually /tokamaks) ALL 30.11 • Insert corrections / ‘1st estimation’ YM 31.12 • Estimate fit parameters ALL 31.1 • Discussion / release ALL next meeting • Other Work • Analysis, papers, ...

  3. Action status – New data • No new data sent • Action ? • Continue waiting • Stop waiting • Waiting: • JFT-2M TT 30.06.07 ? • CHS TT 30.06.07 ? • NSTX SK 30.06.07 ? • MAST MV 30.06.07 ?

  4. Action status – recommended scaling • New version of the database released on 30.6.2006 • IGDBTH4v6 • Contains new data selection parameters, were agreed • Data selection • Different selection criteria: seldb1, 2, IAEA02, ..., EFPW05_red • Some errors in AUG selection • 12 removed (Too early) • 10 added • One error in CMOD data • Density in one discharge • A new version of the DB: IGDBTH4v6b • Comments on fits • F.Ryter agreed

  5. Recommended scaling • Large data set: • Reduced data set: • With changes in selected set: • n: 0.74 => 0.75; B: 074 => 0.73; R: 1.06 => 1.07 • RMS: 29.5% => 29.4; • ITER: Pth(n=1.0): 92 => 93 MW; ITER: Pth(n=0.5) = 31 [28-33] MW Pth(n=1.0) = 42 [38-47] MW ITER: Pth(n=0.5) = 55 [49-61] MW Pth(n=1.0) = 92 [79-107] MW

  6. Action status - analysis • Hysteresis • Variation of ne and Bt dependence with tokamak size • Scaling • Refine scaling • Access to 'good' confinement regime • Minimum threshold power for type I ELMs • Minimum threshold power for good confinement regime • Density at the minimum threshold power • Influence of power fraction to electrons • 0D modelling of discharge evolution

  7. Action status – Issue Card • Enough additional power during pulse evolution • Isotope identity pulses • List of parameters / actions to reduce the threshold power during ITER pulse evolution • What should we do for these ICs ?

  8. Talks • Recent H-mode threshold results on Alcator C-Mod, J. Snipes • Relation between confinement and distance to LH power threshold in ASDEX Upgrade, F. Ryter • DIII-D H-mode threshold and ITER issue implications, J. DeBoo • Data analysis, ITER Issue Card, actions plans, presentations, publications, Y. Martin

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