Effects of trapped electrons on off-axis lower hybrid current drive in tokamaks

doi:10.1088/1009-1963/16/11/052

中国物理B ›› 2007, Vol. 16 ›› Issue (11): 3464-3469.doi: 10.1088/1009-1963/16/11/052

Effects of trapped electrons on off-axis lower hybrid current drive in tokamaks

焦一鸣, 龙永兴, 董家齐, 高庆弟, 王爱科, 刘永

出版日期:2007-11-20 发布日期:2007-11-20

Effects of trapped electrons on off-axis lower hybrid current drive in tokamaks

Jiao Yi-Ming(焦一鸣)^†, Long Yong-Xing(龙永兴), Dong Jia-Qi(董家齐), Gao Qing-Di(高庆弟), Wang Ai-Ke(王爱科), and Liu Yong(刘永)

Southwestern Institute of Physics, Chengdu 610041, China

Online:2007-11-20 Published:2007-11-20

摘要/Abstract

Abstract: The effects of trapped electrons on off-axis lower hybrid current drive (LHCD) in tokamaks are studied, A computer code for solving the Fokker–Planck equation in a toroidal geometry is developed and employed. The code is suitable for various auxiliary heating and current drive schemes in tokamak plasmas. The influence of the resonance regime on the current drive efficiency as well as the influence of trapped particle fraction on the current drive efficiency are emphasized. It is shown that, as an electrostatic force, the lower hybrid wave causes some of the trapped electrons to be untrapped and lose their energy, which can cut the LHCD efficiency by about 30%. The ITER scaling law is also used to estimate the trapped electron effects.

Key words: trapping electron effect, off-axis lower hybrid current drive

中图分类号: (Tokamaks, spherical tokamaks)

52.55.Fa

52.35.Hr (Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid)) 52.50.Sw (Plasma heating by microwaves; ECR, LH, collisional heating) 52.55.Wq (Current drive; helicity injection)

焦一鸣, 龙永兴, 董家齐, 高庆弟, 王爱科, 刘永. Effects of trapped electrons on off-axis lower hybrid current drive in tokamaks[J]. 中国物理B, 2007, 16(11): 3464-3469.

Jiao Yi-Ming(焦一鸣), Long Yong-Xing(龙永兴), Dong Jia-Qi(董家齐), Gao Qing-Di(高庆弟), Wang Ai-Ke(王爱科), and Liu Yong(刘永). Effects of trapped electrons on off-axis lower hybrid current drive in tokamaks[J]. Chinese Physics, 2007, 16(11): 3464-3469.

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Effects of trapped electrons on off-axis lower hybrid current drive in tokamaks

Effects of trapped electrons on off-axis lower hybrid current drive in tokamaks

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