Runaway electron dynamics in Experimental Advanced Superconducting Tokamak helium plasmas
Chen-Xi Luo(罗晨曦)1,2, Long Zeng(曾龙)3,†, Xiang Zhu(朱翔)4,‡, Tian Tang(唐天)1,2, Zhi-Yong Qiu(仇志勇)5, Shi-Yao Lin(林士耀)1, Tao Zhang(张涛)1, Hai-Qing Liu(刘海庆)1, Tong-Hui Shi(石同辉)1, Bin Zhang(张斌)1, Rui Ding(丁锐)1, Wei Gao(高伟)1, Min-Rui Wang(王敏锐)1,2, Wei Gao(高伟)1, Ang Ti(提昂)1, Hai-Lin Zhao(赵海林)1, Tian-Fu Zhou(周天富)1, Jin-Ping Qian(钱金平)1, You-Wen Sun(孙有文)1, Bo Lv(吕波)1, Qing Zang(臧庆)1, Yin-Xian Jie(揭银先)1, Yun-Feng Liang(梁云峰)1,6, and Xiang Gao(高翔)1
1 Institute of Plasma Physics, Hefei Institutes of Physics Science, Chinese Academy of Sciences, Hefei 230031, China; 2 University of Science and Technology of China, Hefei 230031, China; 3 Department of Engineering Physics, Tsinghua University, Beijing 100084, China; 4 Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, China; 5 Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310000, China; 6 Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research Plasma Physics(IEK-4), Jülich 52425, Germany
Abstract The generation of runaway electrons (REs) is observed during the low-density helium ohmic plasma discharge in the Experimental Advanced Superconducting Tokamak (EAST). The growth rate of hard x-ray (HXR) is inversely proportional to the line-average density. Besides, the RE generation in helium plasma is higher than that in deuterium plasma at the same density, which is obtained by comparing the growth rate of HXR with the same discharge conditions. The potential reason is the higher electron temperature of helium plasma in the same current and electron density plateau. Furthermore, two Alfvén eigenmodes driven by REs have been observed. The frequency evolution of the mode is not fully satisfied with the Alfvén scaling and when extension of the Alfvén frequency is towards 0, the high frequency branch is ～ 50 kHz. The different spatial position of the two modes and the evolution of the helium concentration could be used to understand deviation between theoretical and experimental observation.
Fund: Project supported by the National Key R&D Program of China (Grant Nos. 2017YFE0301205 and 2022YFE03050003), the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. Y2021116), the National Natural Science Foundation of China (Grant Nos. 12005262, 12105186, 12175277, and 11975271), and the Users of Excellence Program of Hefei Science Center CAS (Grant No. 2021HSC-UE016).
Corresponding Authors:
Long Zeng, Xiang Zhu
E-mail: zenglong@tsinghua.edu.cn;xzhu@szu.edu.cn
Cite this article:
Chen-Xi Luo(罗晨曦), Long Zeng(曾龙), Xiang Zhu(朱翔), Tian Tang(唐天), Zhi-Yong Qiu(仇志勇),Shi-Yao Lin(林士耀), Tao Zhang(张涛), Hai-Qing Liu(刘海庆), Tong-Hui Shi(石同辉), Bin Zhang(张斌),Rui Ding(丁锐), Wei Gao(高伟), Min-Rui Wang(王敏锐), Wei Gao(高伟), Ang Ti(提昂), Hai-Lin Zhao(赵海林), Tian-Fu Zhou(周天富), Jin-Ping Qian(钱金平), You-Wen Sun(孙有文), Bo Lv(吕波), Qing Zang(臧庆),Yin-Xian Jie(揭银先), Yun-Feng Liang(梁云峰), and Xiang Gao(高翔) Runaway electron dynamics in Experimental Advanced Superconducting Tokamak helium plasmas 2023 Chin. Phys. B 32 075209
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