Spontaneous current relaxation in NBI heated plasmas on EAST

Weixing DING (丁卫星); Haiqing LIU (刘海庆); Jinping QIAN (钱金平); Shoubiao ZHANG (张寿彪); D L BROWER; Zhiyong ZOU (邹志勇); Weiming LI (李维明); Yao YANG (杨曜); Long ZENG (曾龙); Jinlin XIE (谢锦林); Ping ZHU (朱平); Changxuan YU (俞昌旋); Ting LAN (兰婷); Shouxin WANG (王守信); Hui LIAN (连辉); Yinxian JIE (揭银先); Liqun HU (胡立群); Baonian WAN (万宝年)

doi:10.1088/2058-6272/aabe24

Plasma Science and Technology > 2018 > 20(9): 94001-094001. > DOI: 10.1088/2058-6272/aabe24

Weixing DING (丁卫星), Haiqing LIU (刘海庆), Jinping QIAN (钱金平), Shoubiao ZHANG (张寿彪), D L BROWER, Zhiyong ZOU (邹志勇), Weiming LI (李维明), Yao YANG (杨曜), Long ZENG (曾龙), Jinlin XIE (谢锦林), Ping ZHU (朱平), Changxuan YU (俞昌旋), Ting LAN (兰婷), Shouxin WANG (王守信), Hui LIAN (连辉), Yinxian JIE (揭银先), Liqun HU (胡立群), Baonian WAN (万宝年). Spontaneous current relaxation in NBI heated plasmas on EAST[J]. Plasma Science and Technology, 2018, 20(9): 94001-094001. DOI: 10.1088/2058-6272/aabe24

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Spontaneous current relaxation in NBI heated plasmas on EAST

1 University of California Los Angeles, Los Angeles, California 90095, United States of America 2 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China 3 University of Science and Technology of China, Hefei 230026, People’s Republic of China

Funds: This work is supported by National Key R&D Program of China, contract No. 2014GB106002. This work is partly supported by the US D.O.E. contract DESC0010469. This work was also partly supported by the Major Program of Development Foundation of Hefei Center for Physical Science and Technology with contract No. 2016FXZY007.

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Received Date: January 20, 2018

Graphical Abstract

Abstract

Abstract

We report on current profile evolution in EAST NBI driven plasmas where two neutral beams are injected, one during the current ramp phase and the second during flattop. At the end of the current ramp phase, it is found that a flat q profile with q 0 ?～?1 is achieved with low magnetic shear in the core. It is observed that plasma current and density both relax much faster than resistive time, even in the absence of sawtooth activity when H–L transition occurs. Density fluctuations associated with magnetic perturbations (3/2) as a precursor to the H–L transition are observed. It is likely that these modes play a role in fast current transport.
- current transport,
- NBI plasma,
- density fluctuations,
- magnetic perturbations,
- EAST

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References (16)

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