An overview of recent HL-2A experiments

作者：Duan, X. R.; Ding, X. T.; Dong, J. Q.; Yan, L. W.; Liu, Yi; Huang, Y.; Song, X. M.; Zou, X. L.; Xu, M.; Yang, Q. W.; Liu, D. Q.; Rao, J.; Xuan, W. M.; Chen, L. Y.; Mao, W. C.; Wang, Q. M.; Cao, Z.; Li, B.; Cao, J. Y.; Lei, G. J.; Zhang, J. H.; Li, X. D.; Chen, W.; Zhao, K. J.; Xiao, W. W.; Chen, C. Y.; Kong, D. F.; Isobe, M.; Morita, S.; Cheng, J.; Chen, S. Y.; Cui, C. H.; Cui, Z. Y.; Deng, W.; Dong, Y. B.; Feng, B. B.; Hong, W. Y.; Huang, M.; Ji, X. Q.; Li, G. S.; Li, H. J.; Li, Qing

来源：Nuclear Fusion, 2013, 53(10): 104009.

DOI：10.1088/0029-5515/53/10/104009

• ZONAL FLOWS
• PLASMA
• INTERMITTENCY
• TRANSPORT
• BOUNDARY
• PHYSICS

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 Alfven 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 x 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 similar to 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.

• 出版日期2013-10
• 单位中国地震局; 核工业西南物理研究院; 中国科学技术大学