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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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