PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Favourable scenarios established by SMBI for the realization of the ELMy H-mode at HL-2A |
Zheng-Ying Cui(崔正英), Yuan Xu(徐媛), Bei-Bin Feng(冯北滨), Yu-Hong Xu(许宇鸿), Xuan-Tong Ding(丁玄同), Xiao-Quan Ji(季小全), Yong-Gao Li(李永高), Zhong-Bing Shi(石中兵), Wu-Lv Zhong(钟武律), Min Jiang(蒋敏), Shao-Dong Song(宋绍栋), Jun Cheng(程均), Jin-Ming Gao(高金明), Jian-Yong Cao(曹建勇), Chun-Feng Dong(董春凤), Kai Zhang(张凯), Cheng-Yuan Chen(陈程远), Mei Huang(黄梅), Qing-Wei Yang(杨青巍), Xu-Ru Duan(段旭如), HL-2A Team |
Southwestern Institute of Physics, Chengdu 610225, China |
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Abstract The ELMy H-mode plasmas realized with the supersonic molecular beam injection (SMBI) are studied in relation to the energy confinement and the heating power for the L-H transition (PL-H) in the HL-2A tokamak. A database is assembled for this study based on the ELMy H-mode discharges during the experimental campaigns in the period 2009-2013 at the HL-2A tokamak. The statistical results show that the SMBI is favourable for reaching the H-mode by reducing the heating power at the L-H transition and for the H-mode performance by improving the energy confinement compared with the ordinary gas puffing (GP). The reduction of PL-H is about 20% when the density is low, and the energy confinement enhancement factor of HH98y2=τE/τth,98y2 ≈ 1.5 is achieved with the SMBI. Note that in the database the density dependence of PL-H is non-monotonic with the ne,min ≈ 3×1019 m-3 at which the PL-H is minimum. Most of PL-H data are on the low density branch where the PL-H increases with the decrease in density. The minimum of the PL-H in HL-2A is comparable to the ITPA multi-machine threshold power scaling Pthr_scal08. The physics behind the reduction of the PL-H with the SMBI is also investigated in relation to the change of the density gradient at the plasma edge, the gas fuelling efficiency, and the recycling.
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Received: 26 December 2016
Revised: 07 April 2017
Accepted manuscript online:
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PACS:
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52.55.Fa
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(Tokamaks, spherical tokamaks)
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52.55.Dy
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(General theory and basic studies of plasma lifetime, particle and heat loss, energy balance, field structure, etc.)
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52.25.Fi
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(Transport properties)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11375057 and 11175061) and the National Magnetic Confinement Fusion Science Program, China (Grant Nos. 2010GB102003 and 2014GB108003). |
Corresponding Authors:
Zheng-Ying Cui
E-mail: cuizy@swip.ac.cn
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About author: 0.1088/1674-1056/26/8/ |
Cite this article:
Zheng-Ying Cui(崔正英), Yuan Xu(徐媛), Bei-Bin Feng(冯北滨), Yu-Hong Xu(许宇鸿), Xuan-Tong Ding(丁玄同), Xiao-Quan Ji(季小全), Yong-Gao Li(李永高), Zhong-Bing Shi(石中兵), Wu-Lv Zhong(钟武律), Min Jiang(蒋敏), Shao-Dong Song(宋绍栋), Jun Cheng(程均), Jin-Ming Gao(高金明), Jian-Yong Cao(曹建勇), Chun-Feng Dong(董春凤), Kai Zhang(张凯), Cheng-Yuan Chen(陈程远), Mei Huang(黄梅), Qing-Wei Yang(杨青巍), Xu-Ru Duan(段旭如), HL-2A Team Favourable scenarios established by SMBI for the realization of the ELMy H-mode at HL-2A 2017 Chin. Phys. B 26 085205
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