Investigation of LHCD Efficiency and Transformer Recharging in the EAST Tokamak

The efficiency of lower hybrid current drive （LHCD） for limiter and divertor con- figurations in the EAST tokamak is investigated using hot electrical conductivity theory and experimental formulas. The results indicate that the efficiency of current drive in divertor geometry is slightly higher than...

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Published inPlasma science & technology Vol. 14; no. 3; pp. 201 - 206
Main Author 李妙辉 丁伯江 李文科 孔二华 单家方 刘甫坤 王茂 徐旵东
Format Journal Article
LanguageEnglish
Published 01.03.2012
Subjects
EAST
低杂波电流驱动
变压器
实验公式
托卡马克
电流驱动效率
电调
配置效率
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ISSN1009-0630
DOI10.1088/1009-0630/14/3/04

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Summary:The efficiency of lower hybrid current drive （LHCD） for limiter and divertor con- figurations in the EAST tokamak is investigated using hot electrical conductivity theory and experimental formulas. The results indicate that the efficiency of current drive in divertor geometry is slightly higher than that in limiter one. To interpret the experimental results, the GENRAY code is applied to calculate the propagation and absorption of the lower hybrid wave （LHW） in different configurations. The numerical results show that the variation in the parallel refractive index （N//） between the two configurations is quite large. Transformer recharging experiments were also successfully conducted in EAST. By means of the Karney-Fisch method, the absorption index （α） and the upshift factor of refraction （β） for the LHW are obtained. In addition, the maximum recharging efficiency in EAST is about 4% in the divertor configuration, with a line-averaged electron density of ne_av=0.7×10^19m^-3
Bibliography:The efficiency of lower hybrid current drive （LHCD） for limiter and divertor con- figurations in the EAST tokamak is investigated using hot electrical conductivity theory and experimental formulas. The results indicate that the efficiency of current drive in divertor geometry is slightly higher than that in limiter one. To interpret the experimental results, the GENRAY code is applied to calculate the propagation and absorption of the lower hybrid wave （LHW） in different configurations. The numerical results show that the variation in the parallel refractive index （N//） between the two configurations is quite large. Transformer recharging experiments were also successfully conducted in EAST. By means of the Karney-Fisch method, the absorption index （α） and the upshift factor of refraction （β） for the LHW are obtained. In addition, the maximum recharging efficiency in EAST is about 4% in the divertor configuration, with a line-averaged electron density of ne_av=0.7×10^19m^-3
LHCD, CD efficiency, configuration, transformer recharging
34-1187/TL
ISSN:1009-0630
DOI:10.1088/1009-0630/14/3/04