NSTX XP1031: MHD/ELM stability vs. thermoelectric J, edge J, and collisionality -NSTX Physics Mtg. 6/28/10 - S.A. Sabbagh, et al. S.A. Sabbagh 1, T.E.

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NSTX XP1031: MHD/ELM stability vs. thermoelectric J, edge J, and collisionality -NSTX Physics Mtg. 6/28/10 - S.A. Sabbagh, et al. S.A. Sabbagh 1, T.E. Evans 2, L.E. Zakharov 3, J-W. Ahn 4, J. Canik 4, R. Maingi 4, J.W. Berkery 1, J.M. Bialek 1, S. Gerhardt 3, J-K. Park 3, Y-S. Park 1, H. Takahashi 3, K. Tritz 5, et al. 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 Niigata U Tsukuba U U Tokyo JAERI Ioffe Inst TRINITI KBSI KAIST ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching U Quebec NSTX Physics Meeting June 28 th, 2010 Princeton Plasma Physics Laboratory 1 Department of Applied Physics, Columbia University 2 General Atomics 3 Princeton Plasma Physics Laboratory 4 Oak Ridge National Laboratory 5 Johns Hopkins University V1.1

NSTX XP1031: MHD/ELM stability vs. thermoelectric J, edge J, and collisionality -NSTX Physics Mtg. 6/28/10 - S.A. Sabbagh, et al. Continuation of XP1031 last week: MHD/ELM stability dependence on thermoelectric J, edge J, 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 (Vary x-point height; DRSEP) 3) Vary 3D field amplitude 4) Vary toroidal current density near the edge 5) Vary collisionality with LLD Data from last week  Ran many shots on list (except reduced ); need to examine data in detail X-point height and DRSEP varied separately (tricky for operators early on)  ELMs change with variation – much detail to sort out here Target reproduced with ELMs induced by 3D field 50 Hz n = 3 field primarily used, DC field tried but led to rotation issues Scrape-off layer currents detail measured by LLD shunt tiles / Langmuir probe arrays  e.g. n = 1 clearly seen during initial part of ELM, changing to n = even Evidence of ELM stabilization when positive edge current applied (constant B t )

NSTX XP1031: MHD/ELM stability vs. thermoelectric J, edge J, and collisionality -NSTX Physics Mtg. 6/28/10 - S.A. Sabbagh, et al. XP1031: MHD/ELM stability dependence on thermoelectric J, edge J, and collisionality – shot plan Task Number of Shots 1) Generate target A) Preferable is LSN ELMing plasma target (138129, or ), suitable for +/- Z movement4 - Add 3D field (use shot ); then try DC field - choose 3D field magnitude based on XP818 - Plasma control: suggest (i) PF3-boundary position (squareness), (ii) DRSEP, (option: use outer SP control) 2) Vary TE current connection length at fixed 3D field A) LSN: (change PF3-boundary to vary Z, vary DRSEP independently if possible) (three Z positions)6 B) DND:1 C) USN: (two Z positions) - (contrast grad(B) drift direction / effect to condition (2A)) 4 3) Vary 3D field amplitude A) near marginal condition from (2), still ELMing, decrease n = 3 field until ELMs go away3 B) near marginal condition from (2), not ELMing, increase n = 3 field until ELMs return3 4) Vary toroidal current density near the edge A) near marginal condition from (2), still ELMing, decrease I p with slow ramp, attempt ELM stabilization3 B) near marginal condition from (2), not ELMing, increase I p with slow ramp, for ELM destabilization3 C) redo (A) and (B) with TF ramp up/down to keep q approximately fixed4 5) Vary collisionality with LLD A) Rerun successful conditions above at reduced collisionality with LLD 16 Total: 31; 16 V1.3 completed

NSTX XP1031: MHD/ELM stability vs. thermoelectric J, edge J, and collisionality -NSTX Physics Mtg. 6/28/10 - S.A. Sabbagh, et al. Profile comparison (ne, Te vs. psiN) for shots with edge current changed One XP1031 scan examined the effect of toroidal edge current change on ELM stability Constant I p Decreased edge J  Increased edge J  Constant I p Decreased edge J  Increased edge J  /N/N /N/N t = 0.697s

NSTX XP1031: MHD/ELM stability vs. thermoelectric J, edge J, and collisionality -NSTX Physics Mtg. 6/28/10 - S.A. Sabbagh, et al. ELMs generated when 3D field was applied no 3D field w/ 3D field

NSTX XP1031: MHD/ELM stability vs. thermoelectric J, edge J, and collisionality -NSTX Physics Mtg. 6/28/10 - S.A. Sabbagh, et al. XP1031: Evidence of ELM stabilization with positive current ramp + 3D field during ELMing phase ELM-free period (plasma in H-mode) H-L back-transition Constant I p and decrease edge J: similar ELMingConstant I p and increase edge J: ELM-free period found

NSTX XP1031: MHD/ELM stability vs. thermoelectric J, edge J, and collisionality -NSTX Physics Mtg. 6/28/10 - S.A. Sabbagh, et al. H-mode terminates in ELM-free discharge from P rad increase ELM free period H-L back- transition, at I P ramp start, but recovers H-mode Density rises, and P rad sharply rises during ELM-free period