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

• Published in: Chinese physics B Vol. 20; no. 12; pp. 298 - 304
• Main Author: 李妙辉 丁伯江 孔二华 张磊 张新军 钱金平 颜宁 韩效锋 单家方 刘甫坤 王茂 徐旵东 万宝年
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.12.2011
• Subjects: Antennas; Density; Deposition; Emission; H模式放电; Joining; Pipe; Plasma (physics); Plasma density; Tokamak devices; 东亚; 低杂波电流驱动; 参数范围; 托卡马克; 模式耦合; 电流驱动器; 等离子体密度
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/20/12/125202

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 Da 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 trueing code GENRAY are reported.