EPJ Web of Conferences (Jan 2017)

Study of energetic particle physics with advanced ECEI system on the HL-2A tokamak

  • Shi Zhongbing,
  • Jiang Min,
  • Yu Liming,
  • Chen Wei,
  • Shi Peiwan,
  • Zhong Wulyu,
  • Yang Zengchen,
  • Zhang Boyu,
  • Ji Xiaoquan,
  • Li Yonggao,
  • Zhou Yan,
  • Song Shaodong,
  • Huang Mei,
  • Song Xianming,
  • Li Jiaxuan,
  • Yuan Baoshan,
  • Fu Bingzhong,
  • Liu Zetian,
  • Ding Xuantong,
  • Xu Yuhong,
  • Yang Qingwei,
  • Duan Xuru

DOI
https://doi.org/10.1051/epjconf/201714701003
Journal volume & issue
Vol. 147
p. 01003

Abstract

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Understanding the physics of energetic particles (EP) is crucial for the burning plasmas in next generation fusion devices such as ITER. In this work, three types of internal kink modes (a saturated internal kink mode (SK), a resonant internal kink mode (RK), and a double e-fishbone) excited by energetic particles in the low density discharges during ECRH/ECCD heating have been studied by the newly developed 24(poloidal) × 16(radial) = 384 channel ECEI system on the HL-2A tokamak. The SK and RK rotate in the electron diamagnetic direction poloidally and are destabilized by the energetic trapped electrons. The SK is destabilized in the case of qmin > 1, while the RK is destabilized in the case of qmin < 1. The double e-fishbone, which has two m/n = 1/1 modes propagating in the opposite directions poloidally, has been observed during plasma current ramp-up with counter-ECCD. Strong thermal transfer and mode coupling between the two m/n = 1/1 modes have been studied.