Impact of resistive MHD plasma response on perturbation field sidebands

Journal Article · 03 June 2016 · Plasma Physics and Controlled Fusion

DOI: https://doi.org/10.1088/0741-3335/58/7/075009 · OSTI ID:1371734

Orlov, D. M. ^[1]; Evans, T. E. ^[2]; Moyer, R. A. ^[1]; Lyons, B. C. ^[3]; Ferraro, N. M. ^[4]; Park, G-Y ^[5]

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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)

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.

• Research Organization: General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE
• Contributing Organization: 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
• Grant/Contract Number: FC02-04ER54698; AC02-09CH11466; FG02-05ER54809; FC02-06ER54873
• OSTI ID: 1371734
• Alternate ID(s): OSTI ID: 1255457
• Journal Information: Plasma Physics and Controlled Fusion, Vol. 58, 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).; ISSN 0741-3335
• Publisher: IOP ScienceCopyright Statement
• Country of Publication: United States
• Language: English