Itpa cdbm h mode threshold database threshold database status october 2007 naka
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ITPA – CDBM H-mode threshold database Threshold database status 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.

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ITPA – CDBM H-mode threshold database Threshold database status October 2007 - Naka

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ITPA – CDBMH-mode threshold databaseThreshold database statusOctober 2007 - Naka

Yves Martin

Centre de Recherches en Physique des Plasmas

Association Euratom - Confédération Suisse

Ecole Polytechnique Fédérale de Lausanne (EPFL)

CH - 1015 Lausanne, Switzerland

Action list decided in Lausanne, May 2007

  • New data

    • JFT-2M, CHS (TT, done during the meeting)

    • NSTX (SK, before next meeting)

    • MAST (MV, tbd)

  • Data check

    • CMOD (JS, 30 June)

  • Description of data selection criteria (YM, 31 May + next meeting)

    • In the paper – tb discussed

  • New version of DB

    • data checked IGDBTH4v6c (asap, CMOD)

    • New data: IGDBTH4v7 (before next meeting) done without MAST and NSTX

  • Recommended scaling

    • Estimation with changes in data selection (asap, data checked)

    • Errors, Kadomtsev constraint(before next meeting) ... tb discussed

Action list decided in Lausanne, May 2007, cntd

  • Density dependence of threshold power

    • Done in the paper

    • Identify dedicated density scans in threshold DB (CMOD, done during meeting, others: 31 May) Not used in paper/not done

    • Verify if experiments were done and not in threshold DB, then provide data (All, 30 June) Status?

  • Density at minimum threshold power

    • Joint experiment proposed (CDB-10)

    • DB analysis done for the paper

  • Power ratio (PL/Pthresh) in good confinement regimes

    • Identify published good confinement results which are not included in the confinement DB (All, 30 June) and provide data

    • Extract evolution of power ratio for a few typical discharges (All, 15 August)

    • Search for evolution of power ratio in ITER scenarios (YM, 30 June) ... tb discussed

Action status – New data

  • No new data sent from MAST, NSTX

  • Action ?

    • Continue waiting

    • Stop waiting

  • Waiting:

    • NSTXSK?

    • MASTMV?

Action status – recommended scaling ...

  • New version of the database released on 15.8.2007

    • IGDBTH4v7

    • Contains: new data from CHS & JFT2M, corrected CMOD data and selection parameter (SELEC2007)

  • Corrected version on 27.8.2007

    • Selection criteria

      • Phase=LDL removed for AUG

      • Phase=D removed CMOD

  • Checking DB: code to select any tiny change between two versions

    • Issue of format

  • Recommended scaling

    • In paper ... tb discussed

  • Density dependence, minimum threshold power, PL/PThresh, ...

    • In paper ... tb discussed

  • Sensitivity study

    • Received from R.Stambaugh, June 12th:

    • You are requested by the ITER Design Review Working Group #1, Design Requirements and Physics Objectives, to perform the task described as input to the ITER Design Review.

    • Part of the DR&PO Working Group's Task 2, Sensitivity Studies

      • Impact on ITER performance objectives of operating at 10% lower toroidal field

    • Received a spreadsheet with data corresponding with variants of the ITER standard scenarios at -10% toroidal field. Also included: variants which recover full performance by lowering little q, raising density, raising confinement H, raising stability (betaN), or raising elongation at full minor radius

    Sensitivity study: Tasks

    • Task 2.1. Spreadsheet Scalings from the Baseline Scenarios

    • Task 2.2 Scenario Variation Assessments Using Calibrated 1-D Transport Models.

    • Task 2.3. Scenario Variation Assessments Using 1-D Codes With First Principles Transport Models.

    • Task 2.4. Operating Space Diagrams

    • Task 2.5. Projections of Advanced Operating Modes from Current Experiments.

    • Task 2.6. Secondary and More Detailed Consequences of Scenario Variations

      • 2.6.1.L-H Transition Threshold Power

      • 2.6.2. Impact on NNBI voltage and/or shinethrough issues ITER-IO

      • 2.6.3. Impact on ICRF application

      • 2.6.4.Impact on ECH/ECCD application, including NTM situation

      • 2.6.5.Risk of operating at lower q to recover fusion power

      • 2.6.6.Density limit and confinement at high densities

      • 2.6.7.General shift to higher required bN to recover fusion power as BT is reduced, with attendant increased need for wall stabilization

      • 2.6.8.AE mode behavior

      • 2.6.9. ITER support toward DEMO, including power handling issues, steady-state, etc.

      • 2.6.10. Impact on TBM program

    Sensitivity study: report

    • Introduction

    • Influence of the main toroidal field reduction

      • Reduction of the threshold power (from ~90MW to ~80MW at 1020m-3)

    • Sensitivity around reduced field reference

      • Raise plasma current: low q95 values, difficult to quantify, selection criteria to avoid low q95, ITER: at q95=2.8, threshold might increase

      • Increase H98y2 with reduced power: difficult to achieve

      • Increase density: Increase in threshold power but still lower than original scenario

      • Increase elongation: increased threshold power if q95 and Greenwald fraction maintained

      • Decrease T,b,external power: difficult to achieve

    • General comment on ITER threshold power at high density

      • Threshold power 2-3 larger than indicated in Table and larger than available power (hysteresis, PL/Pthresh, density of minimum threshold, ...)


    • Scaling of the L-H Transition at Low Density in C-Mod

    • A. Hubbard (J. Snipes)

    • Validation of DIII-D H_98y2 factor in Power Threshold Database

    • J. Deboo (G. Wang)

    • Sensitivity of L-H power threshold to rotation in DIII-D (given yesterday)

    • P.Gohil

    • Address Mukhovatov questions on ITER guidelines

    • Reports of data submissions, analyses, discussion of IAEA H-mode Meeting paper, etc

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