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Title: Impact of resistive MHD plasma response on perturbation field sidebands

Here, single fluid linear simulations of a KSTAR RMP ELM suppressed discharge with the M3D-C1 resistive magnetohydrodynamic code have been performed for the first time. The simulations show that the application of the n = 1 perturbation using the KSTAR in-vessel control coils (IVCC), which apply modest levels of n = 3 sidebands (~20% of the n = 1), leads to levels of n = 3 sideband that are comparable to the n = 1 when plasma response is included. This is due to the reduced level of screening of the rational-surface-resonant n = 3 component relative to the rational-surface-resonant n = 1 component. The n = 3 sidebands could play a similar role in ELM suppression on KSTAR as the toroidal sidebands (n = 1, 2, 4) in DIII-D n = 3 ELM suppression with missing I-coil segments. This result may help to explain the uniqueness of ELM suppression with n = 1 perturbations in KSTAR since the effective perturbation is a mixed n = 1/n = 3 perturbation similar to n = 3 ELM suppression in DIII-D.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5]
  1. Univ. of California San Diego, La Jolla, CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. General Atomics, San Diego, CA (United States); Oak Ridge Institute for Science Education, Oak Ridge, TN (United States)
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  5. National Fusion Research Institute (NFRI), Daejeon (Korea)
Publication Date:
Grant/Contract Number:
FC02-04ER54698
Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 58; Journal Issue: 7; Related Information: Articles should be cited like the following:Francis L. W. Ratnicks, and P. Kirk Visscher, "Worker Policies in the Honeybee," Nature 342, 796-797 (1989).; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
University of California San Diego, La Jolla, CA, USA Oak Ridge Institute for Science Education, Oak Ridge, TN, USA Princeton Plasma Physics Lab, Princeton NJ, USA National Fusion Research Institute (NFRI), Daejeon, Korea
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY resonant magnetic perturbation; edge stochastic layer; ELM control; plasma response; tokamak
OSTI Identifier:
1371734
Alternate Identifier(s):
OSTI ID: 1371734