Plasma performance improvement with favourable B_t relative to unfavourable B_t in RF-heated H-mode plasmas in EAST

X. Lin; Q.Q. Yang; G.S. Xu; J. Huang; X.Z. Gong; L. Wang; J.P. Qian; B. Zhang; A.M. Garofalo; R. Chen; G.Z. Jia; Y. Ye; Z.Y. Lu; L. Chen; Q. Zang; H.Q. Liu; M.H. Li; Y.M. Wang; L. He; J.C. Xu; Y.W. Yu; S.Y. Lin; Y.M. Duan

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Plasma performance improvement with favourable B_t relative to unfavourable B_t in RF-heated H-mode plasmas in EAST

机译：相对于东部RF加热的H模式等离子体中的不利B_T，等离子体性能改善

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Significant improvement of plasma performance in high-confinement mode (H-mode) discharges with favourable toroidal field B_t, i.e. the ion ▽B drift towards the primary X-point, has been widely observed in the EAST tokamak with pure radio-frequency heating in contrast to that with the unfavourable B_t. Statistical analysis indicates that plasma in the favourable B_t has higher core electron temperature, similar core ion temperature and relatively steeper pedestal density compared with that in the unfavourable 6,. The improvement in plasma performance is mainly contributed by the increase of core electron temperature in the favourable B_t. Further analysis indicates that the plasma with favourable B_t has much lower density and recycling in the scrape-off layer (SOL). Lower SOL density and recycling benefit the mitigation of parametric instability activity of lower hybrid wave (LHW), and thus facilitate the increase of core electron temperature in the favourable B_t. The performance improvement in the favourable B_t demonstrates to be more evident with high LHW power. Divertor local E_r × B drift which can increase the backflow particles from the divertor region to the upstream region could be partly responsible for the much higher SOL plasma density in unfavourable B_t. These findings could facilitate the application of LHW power on future large fusion devices, such as the China Fusion Engineering Test Reactor, to achieve high-performance steady-state operation.

机译：在高限制模式（H模式）中的等离子体性能的显着改善，具有良好的环形场B_T，即离子▽B朝向主要X点漂移，在东部托卡马克中广泛观察到纯射频加热与不利的B_T相比。统计学分析表明，有利的B_T中的等离子体具有更高的核心电子温度，类似的核心离子温度和相对较较较较较较较较令人置更陡峭的基座密度，而在不利的6中相比。等离子体性能的改善主要是由于良好的B_T核心电子温度的增加。进一步的分析表明，具有良好的B_T的等离子体在刮削层（溶胶）中具有远低得多的密度和再循环。较低的溶胶密度和回收利用降低混合波（LHW）的参数稳定性活性的减轻，从而便于良好的B_T中的核心电子温度的增加。有利的B_T的性能改进表明，高LHW功率更明显。转移器本地E_R×B漂移，可以将来自转移器区域的回流颗粒增加到上游区域可以部分地负责不利的B_T中的更高的溶胶等离子体密度。这些发现可以促进LHW电源对未来大型融合设备的应用，如中国融合工程测试反应堆，以实现高性能稳态运行。

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来源
《Nuclear fusion》 |2021年第2期|026014.1-026014.14|共14页
作者
X. Lin; Q.Q. Yang; G.S. Xu; J. Huang; X.Z. Gong; L. Wang; J.P. Qian; B. Zhang; A.M. Garofalo; R. Chen; G.Z. Jia; Y. Ye; Z.Y. Lu; L. Chen; Q. Zang; H.Q. Liu; M.H. Li; Y.M. Wang; L. He; J.C. Xu; Y.W. Yu; S.Y. Lin; Y.M. Duan;
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作者单位

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China University of Science and Technology of China Hefei 230026 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

General Atomics San Diego California 92186-5608 United States of America;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Shenzhen University Shenzhen 518060 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China University of Science and Technology of China Hefei 230026 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China University of Science and Technology of China Hefei 230026 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei 230031 China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
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关键词
plasma performance improvement; favourable toroidal field; EAST; lower hybrid wave (LHW);

机译：等离子体性能改善;有利的环形场;东;较低的混合波（LHW）;

Plasma performance improvement with favourable B_t relative to unfavourable B_t in RF-heated H-mode plasmas in EAST

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