Modeling of the control of the driven current profile in ICRF MCCD on EAST plasma

L. Yin; C. Yang; X. Y. Gong; X. Q. Lu; J. J. Cao; Z. Y. Wu; Y. Chen; D. Du

doi:10.1063/1.5018661

AIP Advances (May 2018)

Modeling of the control of the driven current profile in ICRF MCCD on EAST plasma

L. Yin,
C. Yang,
X. Y. Gong,
X. Q. Lu,
J. J. Cao,
Z. Y. Wu,
Y. Chen,
D. Du

Affiliations

L. Yin: School of Mathematics and Physics, University of South China, Hengyang 421001, China
C. Yang: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
X. Y. Gong: School of Mathematics and Physics, University of South China, Hengyang 421001, China
X. Q. Lu: School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
J. J. Cao: School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
Z. Y. Wu: School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
Y. Chen: School of Mathematics and Physics, University of South China, Hengyang 421001, China
D. Du: School of Mathematics and Physics, University of South China, Hengyang 421001, China

DOI: https://doi.org/10.1063/1.5018661
Journal volume & issue: Vol. 8, no. 5
pp. 055315 – 055315-10

Abstract

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Control of the current profile is a crucial issue for improved confinement and the inhibition of instability in advanced tokamak operation. Using typical discharge data for the Experimental Advanced Superconducting Tokamak, numerical simulations of driven-current profile control in mode conversion current drive (MCCD) in the ion cyclotron range of frequencies were performed employing a full-wave method and Ehst–Karney efficiency formula. Results indicate that the driven current profile in MCCD can be effectively modified by shifting the mode conversion layer. The peak of the driven current can be located at an aimed position in the normalized minor radius range (−0.60≤r/a≤0) by changing the radiofrequency and the minority-ion concentration. The efficiency of the off-axis MCCD can reach 233 kA/MW through optimization, and the mode converted ion cyclotron wave plays an important role in such scenarios. The effects of electron temperature and plasma density on the driven current profile are also investigated.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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