Modeling of = 3 resistive wall mode control in CFETR

Jaimie Zhu; Shuo Wang; Guangzhou Hao; Jiaxian Li; Lei Xue; Gang Jiang

doi:10.1140/epjs/s11734-025-01684-y

2023 Impact factor 2.6

Special Topics

Eur. Phys. J. Spec. Top.
https://doi.org/10.1140/epjs/s11734-025-01684-y

Regular Article

Modeling of $n$ = 3 resistive wall mode control in CFETR

Jaimie Zhu¹^,2, Shuo Wang²^a, Guangzhou Hao², Jiaxian Li², Lei Xue² and Gang Jiang¹

¹ Sichuan University, 610065, Chengdu, People’s Republic of China
² Southwestern Institute of Physics, PO Box 432, Chengdu, People’s Republic of China

^a wangs@swip.ac.cn

Received: 25 January 2025
Accepted: 12 May 2025
Published online: 27 May 2025

Abstract

MARS-F (Liu et al. 2000 Phys. Plasmas 7 3681) is utilized to model $n$ $$n$$ = 3 resistive wall mode (RWM) control for Chinese Fusion Engineering Test Reactor (CFETR) under a 13 $MA$ $\text{MA}$ plasma current, comparing simulation results with those of $n$ $$n$$ = 1 RWM. $n$ $$n$$ = 3 RWM requires higher critical feedback gain for suppression, whereas $n$ $$n$$ = 1 RWM requires higher on-axis Alfvén speed to be suppressed. A synergistic approach combining plasma flow with feedback control is explored. It can be seen that plasma flow can enhance merging of closed-loop roots for $n$ $$n$$ = 3 RWM, resulting in mode growth rate robust to variations in feedback gains. Employing a proportional-derivative (PD) controller further reduces growth rate of $n$ $$n$$ = 3 RWM. Results of synergetic control have shown that $n$ $$n$$ = 3 RWM can be unstable when $n$ $$n$$ = 1 RWM is suppressed in this CFETR scenario. Additionally, MARS-F initial value code is also utilized to investigate time evolution during feedback control for $n$ $$n$$ = 3 RWM, which includes power saturation. By introducing PD controller, both maximum coil current needed to suppress $n$ $$n$$ = 3 RWM and signal oscillation in sensor coil for $n$ $$n$$ = 3 RWM are effectively reduced.

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Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.