Favourable scenarios established by SMBI for the realization of the ELMy H-mode at HL-2A

doi:10.1088/1674-1056/26/8/085205

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 (P_L-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 P_L-H is about 20% when the density is low, and the energy confinement enhancement factor of H_H98y2=τ_E/τ_th,98y2 ≈ 1.5 is achieved with the SMBI. Note that in the database the density dependence of P_L-H is non-monotonic with the n_e,min ≈ 3×10¹⁹m^-3 at which the P_L-H is minimum. Most of P_L-H data are on the low density branch where the P_L-H increases with the decrease in density. The minimum of the P_L-H in HL-2A is comparable to the ITPA multi-machine threshold power scaling P_{thr_scal08}. The physics behind the reduction of the P_L-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/

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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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Favourable scenarios established by SMBI for the realization of the ELMy H-mode at HL-2A

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