Modeling of q95 windows for the suppression of edge localized modes by resonant magnetic perturbations in the KSTAR tokamak

Fitzpatrick, R.; Kim, SangKyeun; Lee, Jaehyun

doi:10.1063/5.0056109

Title: Modeling of q₉₅ windows for the suppression of edge localized modes by resonant magnetic perturbations in the KSTAR tokamak

Journal Article · 24 August 2021 · Physics of Plasmas

DOI: https://doi.org/10.1063/5.0056109 · OSTI ID:1818862

^[1]; Kim, SangKyeun ^[2];

^[3]

Univ. of Texas, Austin, TX (United States); Institute for Fusion Studies, Department of Physics, University of Texas at Austin
Princeton Univ., NJ (United States)
Korea Inst. of Fusion Energy, Daejeon (South Korea)

The EPEC code is employed to model the q95 windows for n = 2 and n = 1 resonant magnetic perturbation (RMP)-induced edge localized mode (ELM) suppression in typical KSTAR H-mode discharges. The plasma equilibria used in the study are derived by rescaling the experimental plasma equilibrium in KSTAR discharge #18594 measured at time t = 6450 ms. The n = 2 and n = 1 ELM suppression windows predicted by EPEC are comparatively narrow in q95 (i.e., Δq₉₅ ≃ 0.1) and are such that (assuming a relative pedestal pressure reduction of 15% is required to trigger ELM suppression), even in the middle of the windows, there is a threshold RMP coil current of about 1–3 kA/turn that must be exceeded before ELM suppression occurs. Furthermore, the n = 2 and n = 1 ELM suppression windows calculated by the EPEC code are consistent with the experimental observations and are also broadly similar to those recently calculated by the TM1 code [Hu et al., Phys. Plasmas 28, 052505 (2021)].

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Research Organization:: Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FG02-04ER54742

OSTI ID:: 1818862

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 28; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Modeling of q95 windows for the suppression of edge localized modes by resonant magnetic perturbations in the KSTAR tokamak

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Title: Modeling of q₉₅ windows for the suppression of edge localized modes by resonant magnetic perturbations in the KSTAR tokamak