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Chin. Phys. B, 2017, Vol. 26(8): 085205    DOI: 10.1088/1674-1056/26/8/085205
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

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
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.

Keywords:  ELMy H-mode      SMBI      L-H transition      energy confinement      database  
Received:  26 December 2016      Revised:  07 April 2017      Accepted manuscript online: 
PACS:  52.55.Fa (Tokamaks, spherical tokamaks)  
  52.55.Dy (General theory and basic studies of plasma lifetime, particle and heat loss, energy balance, field structure, etc.)  
  52.25.Fi (Transport properties)  
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
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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