Validation of density pump-out by pedestal-foot magnetic island formation prior to ELM suppression in KSTAR and DIII-D tokamaks

Hu, Q. M.; Park, J. -K.; Yang, S. M.; Kim, S. K.; Logan, N. C.; Nazikian, R.; Kang, J.; Paz-Soldan, C.; Ko, W. H.; Park, G. Y.

doi:10.1088/1741-4326/ace5c0

Title: Validation of density pump-out by pedestal-foot magnetic island formation prior to ELM suppression in KSTAR and DIII-D tokamaks

Journal Article · Mon Jul 24 00:00:00 EDT 2023 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ace5c0· OSTI ID:1992382

;

; Ko, W. H.; Park, G. Y.

TM1 nonlinear two-fluid simulations reveal key characteristics of density pump-out caused by pedestal-foot island formation when applying resonant magnetic perturbation (RMP). These characteristics include a bifurcation in pump-out with a low RMP coil current threshold, a sensitivity of pump-out magnitude to q95, and the magnitude of pump-out scaling as the square root of the RMP coil current. Dedicated experiments are carried out in the KSTAR and DIII-D tokamaks to validate these features and show that: (1) a staircase bifurcation in density pump-out is observed when slowly ramping up the n = 1 RMP current, and the density fluctuations are found to be slightly decreased from the pedestal-foot to the pedestal-top; (2) the magnitude of density pump-out becomes weaker when decreasing q95 from 5.5 to 4.9, and a partial recovery of density pump-out is observed when q95 is ramped down to lower than 4.9; and (3) analysis of a DIII-D database of n = 3 RMP edge-localized mode control experiments finds that the magnitude of density pump-out is proportional to the square root of RMP coil current Δne/ne ∝ $$I_{{\text{RMP}}}^{\,0.5}$$. These experimental observations are consistent with TM1 simulations.

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Research Organization:: General Atomics, San Diego, CA (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-09CH11466; EN2301-14; FC02-04ER54698; AC52-07NA27344; SC0022270; SC0021968

OSTI ID:: 1992382

Alternate ID(s):: OSTI ID: 1992335; OSTI ID: 1995162

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Vol. 63 Journal Issue: 9; ISSN 0029-5515

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: IAEA

Language:: English

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Title: Validation of density pump-out by pedestal-foot magnetic island formation prior to ELM suppression in KSTAR and DIII-D tokamaks

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