Reduction of impurity confinement time by combined heating of LHW and ECRH in EAST

doi:10.1088/1674-1056/abe1a6

中国物理B ›› 2021, Vol. 30 ›› Issue (7): 75205-075205.doi: 10.1088/1674-1056/abe1a6

Reduction of impurity confinement time by combined heating of LHW and ECRH in EAST

Zong Xu(许棕)^1,2, Zhen-Wei Wu(吴振伟)^3,†, Ling Zhang(张凌)^3,‡, Yue-Heng Huang(黄跃恒)^1,2, Wei Gao(高伟)³, Yun-Xin Cheng(程云鑫)^3,4, Xiao-Dong Lin(林晓东)^1,2, Xiang Gao(高翔)^1,2,3, Ying-Jie Chen(陈颖杰)³, Lei Li(黎嫘)^3,4, Yin-Xian Jie(揭银先)^1,2,3, Qing Zang(臧庆)^1,2,3, Hai-Qing Liu(刘海庆)³, and EAST team³

1 Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, China;
2 Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China;
3 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;
4 University of Science & Technology of China, Hefei 230031, China

收稿日期:2020-10-31 修回日期:2021-01-27 接受日期:2021-02-01 出版日期:2021-06-22 发布日期:2021-07-02
通讯作者: Zhen-Wei Wu, Ling Zhang E-mail:zwwu@ipp.ac.cn;zhangling@ipp.ac.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFE031110 and 2017YFE0301205), the National Natural Science Foundation of China (Grant Nos. 11905146, 11775269, and 11805113), the Users with Excellence Program of Hefei Science Center, Chinese Academy of Sciences (Grant No. 2019HSC-UE014), and the Fund from the Shenzhen Clean Energy Research Institute, China.

Reduction of impurity confinement time by combined heating of LHW and ECRH in EAST

1 Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, China;
2 Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China;
3 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;
4 University of Science & Technology of China, Hefei 230031, China

Received:2020-10-31 Revised:2021-01-27 Accepted:2021-02-01 Online:2021-06-22 Published:2021-07-02
Contact: Zhen-Wei Wu, Ling Zhang E-mail:zwwu@ipp.ac.cn;zhangling@ipp.ac.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFE031110 and 2017YFE0301205), the National Natural Science Foundation of China (Grant Nos. 11905146, 11775269, and 11805113), the Users with Excellence Program of Hefei Science Center, Chinese Academy of Sciences (Grant No. 2019HSC-UE014), and the Fund from the Shenzhen Clean Energy Research Institute, China.

摘要/Abstract

摘要： The core impurity confinement properties are experimentally investigated in the Experimental Advanced Superconducting Tokamak (EAST) plasma heated by lower hybrid wave (LHW) and electron cyclotron resonance heating (ECRH) (LHW+ECRH). It is shown that the impurity confinement time (τ_imp) in the L-mode plasma jointly heated by LHW and ECRH is weakly dependent on electron density but strongly dependent on the heating power, thus it is shorter than that in LHW-only heated L-mode plasma with the similar plasma parameters. The combined heating of LHW and ECRH can reduce the collisionality and indicates a more effective heating method for core τ_imp reduction and normalized poloidal beta (β_P) improvement. It should be emphasized that in this high β_P operation window the small ELM regime can be accessed, and an L-mode level τ_imp (40 ms-80 ms) and high β_N (～1.7) can be obtained simultaneously. It means that this typical small ELMy H-mode regime has an advantage in avoiding the serious tungsten accumulation, and will be competitive in future long-pulse steady-state and high-performance operation with high-Z material plasma-facing components.

关键词: LHW and ECRH heating, impurity confinement time, tungsten, small ELMs regime, EAST

Abstract: The core impurity confinement properties are experimentally investigated in the Experimental Advanced Superconducting Tokamak (EAST) plasma heated by lower hybrid wave (LHW) and electron cyclotron resonance heating (ECRH) (LHW+ECRH). It is shown that the impurity confinement time (τ_imp) in the L-mode plasma jointly heated by LHW and ECRH is weakly dependent on electron density but strongly dependent on the heating power, thus it is shorter than that in LHW-only heated L-mode plasma with the similar plasma parameters. The combined heating of LHW and ECRH can reduce the collisionality and indicates a more effective heating method for core τ_imp reduction and normalized poloidal beta (β_P) improvement. It should be emphasized that in this high β_P operation window the small ELM regime can be accessed, and an L-mode level τ_imp (40 ms-80 ms) and high β_N (～1.7) can be obtained simultaneously. It means that this typical small ELMy H-mode regime has an advantage in avoiding the serious tungsten accumulation, and will be competitive in future long-pulse steady-state and high-performance operation with high-Z material plasma-facing components.

Key words: LHW and ECRH heating, impurity confinement time, tungsten, small ELMs regime, EAST

中图分类号: (Transport properties)

52.25.Fi

52.35.Ra (Plasma turbulence) 52.25.Vy (Impurities in plasmas) 52.20.Hv (Atomic, molecular, ion, and heavy-particle collisions)

Zong Xu(许棕), Zhen-Wei Wu(吴振伟), Ling Zhang(张凌), Yue-Heng Huang(黄跃恒), Wei Gao(高伟), Yun-Xin Cheng(程云鑫), Xiao-Dong Lin(林晓东), Xiang Gao(高翔), Ying-Jie Chen(陈颖杰), Lei Li(黎嫘), Yin-Xian Jie(揭银先), Qing Zang(臧庆), Hai-Qing Liu(刘海庆), and EAST team. Reduction of impurity confinement time by combined heating of LHW and ECRH in EAST[J]. 中国物理B, 2021, 30(7): 75205-075205.

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Reduction of impurity confinement time by combined heating of LHW and ECRH in EAST

Reduction of impurity confinement time by combined heating of LHW and ECRH in EAST

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