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

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

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.

Keywords: trapping electron effect off-axis lower hybrid current drive

Accepted manuscript online:

PACS:	52.55.Fa	(Tokamaks, spherical tokamaks)
	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)

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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 2007 Chinese Physics 16 3464

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

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