Analytic study of density limit mechanism for tokamak lower hybrid current drive experiments

被引：3
|
作者：
Shi, BR [1 ]
机构：
[1] SW Inst Phys, Chengdu 610041, Peoples R China
来源：
CHINESE PHYSICS LETTERS | 2001年 / 18卷 / 02期
关键词：
D O I：
10.1088/0256-307X/18/2/333
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The dispersion relation of the lower hybrid wave in the tokamak current drive regime (omega > 2 omega (LH), where omega (LH) is the lower hybrid frequency) is analysed. Toroidicity effects can shift the parallel refractive index upward or downward. The downward shift will lead to a mode conversion from the slow wave to the fast wave. It is indicated that this is the main mechanism limiting the effectiveness of tokamak lower hybrid current drive. Accordingly a sufficient condition is obtained for the wave penetration, corresponding to a critical density, which is proportional to f(4/3)B(2/3)(A)(4/3), with f being the wave frequency, B the magnetic field strength and A the aspect ratio. Quantitative agreement with experiments is found.
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页码：251 / 253
页数：3
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