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SUMMARY OF 4th IPTA TRANSPORT AND ITB PHYSICS TG MEETING St. Petersburg, Russia, April 8-11, 2003

SUMMARY OF 4th IPTA TRANSPORT AND ITB PHYSICS TG MEETING St. Petersburg, Russia, April 8-11, 2003. Presented by E.J. Doyle for the TG Note: this summary does not cover the joint sessions with the CDBM TG, or the discussions on the generation of the Tokamak Physics Basis Document.

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SUMMARY OF 4th IPTA TRANSPORT AND ITB PHYSICS TG MEETING St. Petersburg, Russia, April 8-11, 2003

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  1. SUMMARY OF 4th IPTA TRANSPORT AND ITB PHYSICS TG MEETINGSt. Petersburg, Russia, April 8-11, 2003 Presented by E.J. Doyle for the TGNote: this summary does not cover the joint sessions with the CDBM TG, or the discussions on the generation of the Tokamak Physics Basis Document

  2. INTERNATIONAL COLLABORATIVE EXPERIMENTS • JET, very extensive response to ITPA requests • US participation, JA uncertain • DIII-D, more limited response, concentrated on hybrid and steady-sate scenarios, as well as QDB/QH-mode • EU is participating • JT-60U, experimental planning is not complete, participation will depend on exact dates and experiments run • AUG - not represented at this meeting, need details • TEXTOR - new capabilities will be employed in 2003, intention is to contribute to no-momentum ITB studies • Conclusion: process will need time to settle down, but good start • Key for future will be ability to participate in experimental planning stage • Need better experimental definitions in future • Action item, to pursue turbulence simulations for T-10 data set, initial contacts made with J. Weiland

  3. INTERNATIONAL PROFILE DATABASE STATUS • Database manager, T. Fukuda, has resigned • Replacement to be discussed at ITBDB working meeting • Discusses scalar ITB database, desirability of incorporating into common ITPA format • Agreed that this is desirable, practical questions to be pursued with K. Thomsen • Reviewed status of data entry, incompatibilities between versions, etc. • Further data selection to be made at ITBDB working session • Action item: address confusion in community from differing use/meaning of term “profile database” • Additional JET data submitted, including pure electron ITB case

  4. ITB MODELING • Modeling is sensitive to plasma parameters, consequently, choices of how many transport channels to simulate leads to very different final results • Specific example is modeling of same JET discharge using JETTO, but with different no. of channels modeled, results are different • NOTE - This is also true in experiment, tiny changes in conditions have major impact • Start made on modeling of edge-core interactions using JET data and JETTO • Renormalized version of GLF23 is now available. Fixes problem with calculation of growth rates with negative shear, high alpha. • Action item: test on ITBDB

  5. GROUP ACTIVITIES AND PLANS • Reviews back on ITB review paper. Many detailed suggestions, but overall quite positive, clear that paper will be published • Next meeting in San Diego, after H-mode/ITB Physics workshop, starting Monday September 29 • Spring 2004 meeting at JAERI Naka, either week of March 22, or May 10 • Response to Diagnostic TG: making progress on detailed response to diagnostic justifications. Start made on modeling of effect of diagnostic resolution using transport codes

  6. UPDATE ON RECENT RESULTS • Extensive set of experiments performed on JET since 2002 IAEA. Highlights include: • JET/AUG experiment to replicate improved H-mode regime was successful • However, attempt to expand improved H-mode regime to higher field, lower rho_star failed • Wide ITBs have been maintained in steady-state plasmas with mild ELM activity and no impurity accumulation • Developed steady-state ITB at high triangularity • Several presentations on the role of q profile on ITB formation, on T-10, JT-60U and TUMAN-3M. These effects are not fully understood at present, and are not included in models • Possible overlap in physics with stellarator community, input expected • ST research has progressed to the point where NSTX and MAST can start to contribute to work of the group, as well as significant data • Extend turbulence and transport into new regimes, e.g. beta

  7. PAPER AND PRESENTATION PLANS • Contributed EPS paper and poster by T. Fujita on examination of key parameters for ITB formation has been accepted • Focus of paper will be on testing the applicability of the JET ITB criterion in rho_star • Paper will also discuss physics content of JET criterion, and when it would be expected to be inapplicable • Needs further transport analysis to reach definite conclusion, but much work already done • Proposal by X. Litaudon for a paper at H-mode and ITB Physics workshop on Advanced Tokamak Regimes, including a discussion of prospects based on a multi-machine comparison • Intention is to demonstrate that AT regimes are now approaching a level of performance and reliability such that confidence in applicability to ITER operation is substantially enhanced • Use of multi-machine data is key to conveying readiness

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