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An overview of recent HL-2A experiments

  • Author(s): Duan, XR
  • Ding, XT
  • Dong, JQ
  • Yan, LW
  • Liu, Y
  • Huang, Y
  • Song, XM
  • Zou, XL
  • Xu, M
  • Yang, QW
  • Liu, DQ
  • Rao, J
  • Xuan, WM
  • Chen, LY
  • Mao, WC
  • Wang, QM
  • Cao, Z
  • Li, B
  • Cao, JY
  • Lei, GJ
  • Zhang, JH
  • Li, XD
  • Chen, W
  • Zhao, KJ
  • Xiao, WW
  • Chen, CY
  • Kong, DF
  • Isobe, M
  • Morita, S
  • Cheng, J
  • Chen, SY
  • Cui, CH
  • Cui, ZY
  • Deng, W
  • Dong, YB
  • Feng, BB
  • Hong, WY
  • Huang, M
  • Ji, XQ
  • Li, GS
  • Li, HJ
  • Li, Q
  • Liu, CH
  • Peng, JF
  • Shi, BZ
  • Wang, YQ
  • Yao, LH
  • Yao, LY
  • Yu, DL
  • Yu, LM
  • Yuan, BS
  • Zhou, J
  • Zhou, Y
  • Zhong, WL
  • Tynan, G
  • Diamond, P
  • Yu, CX
  • Liu, Y
  • et al.
Abstract

For the first time supersonic molecular beam injection (SMBI) and cluster jet injection (CJI) were applied to mitigate edge-localized modes (ELMs) in HL-2A successfully. The ELM frequency increased by a factor of 2-3 and the heat flux on the divertor target plates decreased by 50% on average after SMBI or CJI. Energetic particle induced modes were observed in different frequency ranges with high-power electron cyclotron resonance heating (ECRH). The high frequency (200-350 kHz) of the modes with a relatively small amplitude was close to the gap frequency of the toroidicity-induced Alfvén eigenmode. The coexistent multi-mode magnetic structures in the high-temperature and low-collision plasma could affect the plasma transport dramatically. Long-lived saturated ideal magnetohydrodynamic instabilities during strong neutral beam injection heating could be suppressed by high-power ECRH. The absolute rate of nonlinear energy transfer between turbulence and zonal flows was measured and the secondary mode competition between low-frequency (LF) zonal flows (ZFs) and geodesic acoustic modes (GAMs) was identified, which demonstrated that ZFs played an important role in the L-H transition. The spontaneously generated E × B shear flow was identified to be responsible for the generation of a large-scale coherent structure (LSCS), which provided unambiguous experimental evidence for the LSCS generation mechanism. New meso-scale electric potential fluctuations (MSEFs) at frequency f ∼ 10.5 kHz with two components of n = 0 and m/n = 6/2 were also identified in the edge plasmas for the first time. The MSEFs coexisted and interacted with magnetic islands of m/n = 6/2, turbulence and LF ZFs. © 2013 IAEA, Vienna.

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