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XP1031: MHD/ELM stability dependence on thermoelectric J, edge J, and collisionality

Supported by. Columbia U Comp-X General Atomics INEL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics NYU ORNL PPPL PSI SNL UC Davis UC Irvine UCLA UCSD U Maryland U New Mexico U Rochester U Washington U Wisconsin Culham Sci Ctr Hiroshima U HIST Kyushu Tokai U

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XP1031: MHD/ELM stability dependence on thermoelectric J, edge J, and collisionality

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  1. Supported by Columbia U Comp-X General Atomics INEL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics NYU ORNL PPPL PSI SNL UC Davis UC Irvine UCLA UCSD U Maryland U New Mexico U Rochester U Washington U Wisconsin Culham Sci Ctr Hiroshima U HIST Kyushu Tokai U Niigata U Tsukuba U U Tokyo JAERI Ioffe Inst TRINITI KBSI KAIST ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching U Quebec XP1031: MHD/ELM stability dependence on thermoelectric J, edge J, and collisionality S.A. Sabbagh1, T.E. Evans2, L.E. Zakharov3, J-W. Ahn4, J. Canik4, R. Maingi4, J.W. Berkery1, J.M. Bialek1, S. Gerhardt3, J-K. Park3, Y-S. Park1, H. Takahashi3, K. Tritz5, et al. 1Department of Applied Physics, Columbia University 2General Atomics 3Princeton Plasma Physics Laboratory 4Oak Ridge National Laboratory 5Johns Hopkins University NSTX Physics Meeting June 7th, 2010 Princeton Plasma Physics Laboratory V1.0

  2. Target conditions set-up for XP1031: MHD/ELM stability dependence on thermoelectric J, edge J, n • Goals/Approach • Test expectations ELM stability theory considering changes to edge toroidal current density, field-aligned thermoelectric current, and collisionality • 1) Generate target • 2) Vary TE current connection length at fixed 3D field • 3) Vary 3D field amplitude • 4) Vary toroidal current density near the edge • 5) Vary collisionality with LLD • Data from last week • Completed Step (1), using target from LLD XP1000 (4 shots / 2 good shots) • intermediate elongation and triangularity successfully re-created using strike point control • small evidence of ELM activity, dithering, indicating marginal stability of ELMs • 50 Hz n = 3 field applied to the plasma, yielded ELMing plasma during n = 3 field • Scrape-off layer currents were measured by the new LLD shunt tiles and Langmuir probe arrays

  3. Target configuration reproduced, some changes in profiles • Profiles taken at same time, but had somewhat different b • Examine further, choose profiles at same b Target no 3D field w/ 3D field Target no 3D field w/ 3D field

  4. ELMs generated when 3D field was applied w/ 3D field no 3D field

  5. Scrape-off later currents during ELMs measured by LLD shunt tiles and Langmuir probe array • Lamgmuir probe current • Measured during ELM generated after application of 3D field • Similar data taken with LLD shunt tiles

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