Resonant mode effects on rotation braking induced by n = 1 resonant magnetic perturbations in the EAST tokamak

H. Sheng; Y.W. Sun; X.Y. Li; H.H. Li; X.M. Wu; Y.Y. Li; S.F. Mao; Q. Ma; Y.Q. Liu; C. Ye; X.T. Yan; P.C. Xie; Q. Zang; H.H. Wang; M.N. Jia; M.Y. Ye; the EAST Team

doi:10.1088/1741-4326/acd206

Nuclear Fusion (Jan 2023)

Resonant mode effects on rotation braking induced by n = 1 resonant magnetic perturbations in the EAST tokamak

H. Sheng,
Y.W. Sun,
X.Y. Li,
H.H. Li,
X.M. Wu,
Y.Y. Li,
S.F. Mao,
Q. Ma,
Y.Q. Liu,
C. Ye,
X.T. Yan,
P.C. Xie,
Q. Zang,
H.H. Wang,
M.N. Jia,
M.Y. Ye,
the EAST Team

Affiliations

H. Sheng: ORCiD; School of Nuclear Science and Technology, University of Science and Technology of China , Hefei 230026, China; Institute of Plasma Physics, Chinese Academy of Sciences , PO Box 1126, Hefei 230031, China
Y.W. Sun: ORCiD; Institute of Plasma Physics, Chinese Academy of Sciences , PO Box 1126, Hefei 230031, China
X.Y. Li: Institute of Plasma Physics, Chinese Academy of Sciences , PO Box 1126, Hefei 230031, China
H.H. Li: Institute of Plasma Physics, Chinese Academy of Sciences , PO Box 1126, Hefei 230031, China; College of Electrical and Electronic Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China
X.M. Wu: Institute of Plasma Physics, Chinese Academy of Sciences , PO Box 1126, Hefei 230031, China
Y.Y. Li: ORCiD; Enn Science and Technology Development Co., Ltd , Langfang, China
S.F. Mao: ORCiD; School of Nuclear Science and Technology, University of Science and Technology of China , Hefei 230026, China
Q. Ma: ORCiD; School of Nuclear Science and Technology, University of Science and Technology of China , Hefei 230026, China; Institute of Plasma Physics, Chinese Academy of Sciences , PO Box 1126, Hefei 230031, China
Y.Q. Liu: ORCiD; General Atomics , PO Box 85608, San Diego, CA 92186-5608, United States of America
C. Ye: ORCiD; School of Nuclear Science and Technology, University of Science and Technology of China , Hefei 230026, China; Institute of Plasma Physics, Chinese Academy of Sciences , PO Box 1126, Hefei 230031, China
X.T. Yan: ORCiD; Institute of Plasma Physics, Chinese Academy of Sciences , PO Box 1126, Hefei 230031, China
P.C. Xie: ORCiD; School of Nuclear Science and Technology, University of Science and Technology of China , Hefei 230026, China; Institute of Plasma Physics, Chinese Academy of Sciences , PO Box 1126, Hefei 230031, China
Q. Zang: Institute of Plasma Physics, Chinese Academy of Sciences , PO Box 1126, Hefei 230031, China
H.H. Wang: ORCiD; Institute of Plasma Physics, Chinese Academy of Sciences , PO Box 1126, Hefei 230031, China
M.N. Jia: ORCiD; Institute of Plasma Physics, Chinese Academy of Sciences , PO Box 1126, Hefei 230031, China
M.Y. Ye: ORCiD; School of Nuclear Science and Technology, University of Science and Technology of China , Hefei 230026, China
the EAST Team

DOI: https://doi.org/10.1088/1741-4326/acd206
Journal volume & issue: Vol. 63, no. 7
p. 076002

Abstract

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The spectrum effects on toroidal rotation braking, induced by n = 1 resonant magnetic perturbations (RMPs) in the discharges with $q_{95} = 4.1$ and $q_{95} = 5.1$ , are studied in the EAST tokamak. Here n is the toroidal mode number, RMP spectrum is varied by scanning $\delta\phi_\mathrm{UL} $ , the phase difference between the upper and lower rows of RMP coils. The toroidal rotation changes periodically with the periodic $\delta\phi_\mathrm{UL} $ scanning and such an effect is stronger in the discharge with lower $q_{95} = 4.1$ . The spectrum dependence of the neoclassical toroidal viscosity (NTV) torque, modeled by NTVTOK based on the magnetic perturbation obtained from MARS-F calculation, agrees well with that of the experimentally observed braking torques in both discharges. The modeled NTV torque is stronger in the discharge with lower q _95 , which also agrees with the observations. The comparisons between the spectrum dependence of the NTV and magnetic perturbations show that the resonant mode of magnetic perturbations near the plasma edge mainly contribute the NTV torque. These agreements between modeling and experiments highlight the capability of NTV theory in explaining the experimental observation in the EAST tokamak.

Published in Nuclear Fusion

ISSN: 0029-5515 (Print); 1741-4326 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Physics: Nuclear and particle physics. Atomic energy. Radioactivity
Website: https://iopscience.iop.org/journal/0029-5515

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