Edge localized mode suppression and plasma response using mixed toroidal harmonic resonant magnetic perturbations in DIII-D

Gu, S.; Sun, Y.; Paz-Soldan, C.; Nazikian, R.; Jia, M.; Wang, H. H.; Guo, W.; Liu, Y. Q.; Abrams, T.; Cui, L.; Evans, T.; Garofalo, A.; Gong, X.; Logan, N. C.; Munaretto, S.; Orlov, D.; Shi, T.

doi:10.1088/1741-4326/aaf5a3

Title: Edge localized mode suppression and plasma response using mixed toroidal harmonic resonant magnetic perturbations in DIII-D

Journal Article · 03 January 2019 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/aaf5a3 · OSTI ID:1557634

^[1];

^[2];

^[3]; Nazikian, R. ^[4];

^[5]; Wang, H. H. ^[2];

^[2]; Liu, Y. Q. ^[3]; Abrams, T. ^[3]; Cui, L. ^[4]; Evans, T. ^[3];

^[3]; Gong, X. ^[2];

^[4];

^[3];

^[6]; Shi, T. ^[2]

Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics; Univ. of Science and Technology of China, Hefei (China); General Atomics
Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics
General Atomics, San Diego, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics; Univ. of Science and Technology of China, Hefei (China)
Univ. of California, San Diego, CA (United States)

Edge localized mode (ELM) suppression has been achieved in the DIII-D tokamak using mixed toroidal n = 2 and 3 harmonic resonant magnetic perturbations (RMPs). Here n is the toroidal mode number. It is determined that mixed toroidal harmonic RMPs lower the threshold current for ELM suppression compared to the single n= 3 case. The decreased threshold suggests that mixed toroidal harmonic RMPs offer a better path to ELM control. The error field effect is studied by superimposing n = 2 error field correction upon the n = 2 phase scan, which shows that it is possible to suppress the ELM and correct the error field simultaneously. The plasma response calculated by magnetic sensors shows the n = 3 harmonic plays a key role in ELM suppression using mixed toroidal harmonic RMPs. A nonlinear jump in the n = 3 plasma response is observed during the bifurcation from mitigation to suppression of ELMs, similar to the n = 2 results reported in Nazikian et al (2015 Phys. Rev. Lett. 114 5). Magneto-hydrodynamic simulations using toroidal rotation find good agreement with the ELM mitigated phase when the input rotation profile is high and induces strong screening of the RMP. Simulations with zero-crossing rotation find strong penetration of the RMP and reproduce the mode structure of ELM suppression on both the low and high field side. This indicates that edge components may penetrate during the transition from ELM mitigation to suppression.

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Research Organization:: General Atomics, San Diego, CA (United States); Princeton Univ., NJ (United States); Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: National Key R&D Program of China; National Natural Science Foundation of China; USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698; FG02-05ER54809

OSTI ID:: 1557634

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 2 Vol. 59; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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