Investigation of lower hybrid current drive during H-mode in EAST tokamak

doi:10.1088/1674-1056/20/12/125202

Abstract H-mode discharges with lower hybrid current drive (LHCD) alone are achieved in EAST divertor plasma over a wide parameter range. These H-mode discharges are characterized by a sudden drop in D_α emission and a spontaneous rise in main plasma density. Good lower hybrid (LH) coupling during H-mode is obtained by putting the plasma close to the antenna and by injecting D₂ gas from a pipe near the grill mouse. The analysis of lower hybrid current drive properties shows that the LH deposition profile shifts off axis during H-mode, and current drive (CD) efficiency decreases due to the increase in density. Modeling results of H-mode discharges with a general ray tracing code GENRAY are reported.

Keywords: H-mode edge localized mode lower hybrid current drive

Received: 20 March 2011
Revised: 15 June 2011
Accepted manuscript online:

PACS:	52.50.Sw	(Plasma heating by microwaves; ECR, LH, collisional heating)
	52.65.Ff	(Fokker-Planck and Vlasov equation)
	52.40.Db	(Electromagnetic (nonlaser) radiation interactions with plasma)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10875149 and 10805057) and the National Magnetic Confinement Fusion Science Program of China (Grant No. 2010GB105004).

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Li Miao-Hui(李妙辉), Ding Bo-Jiang(丁伯江), Kong Er-Hua(孔二华), Zhang Lei(张磊), Zhang Xin-Jun(张新军), Qian Jin-Ping(钱金平), Yan Ning(颜宁), Han Xiao-Feng(韩效锋), Shan Jia-Fang(单家方), Liu Fu-Kun(刘甫坤), Wang Mao(王茂), Xu Han-Dong(徐旵东), and Wan Bao-Nian(万宝年) Investigation of lower hybrid current drive during H-mode in EAST tokamak 2011 Chin. Phys. B 20 125202

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Investigation of lower hybrid current drive during H-mode in EAST tokamak

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