An Investigation of LHCD Efficiency and Transformer Recharging in the EAST Tokamak

LI Miaohui(李妙辉); DING Bojiang(丁伯江); LI Wenke(李文科); KONG Erhua(孔二华); SHAN Jiafang(单家方); LIU Fukun(刘甫坤); WANG Mao(王茂); XU Handong(徐旵东)

doi:10.1088/1009-0630/14/3/04

Plasma Science and Technology > 2012 > 14(3): 201-206. > DOI: 10.1088/1009-0630/14/3/04

LI Miaohui(李妙辉), DING Bojiang(丁伯江), LI Wenke(李文科), KONG Erhua(孔二华), SHAN Jiafang(单家方), LIU Fukun(刘甫坤), WANG Mao(王茂), XU Handong(徐旵东). An Investigation of LHCD Efficiency and Transformer Recharging in the EAST Tokamak[J]. Plasma Science and Technology, 2012, 14(3): 201-206. DOI: 10.1088/1009-0630/14/3/04

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An Investigation of LHCD Efficiency and Transformer Recharging in the EAST Tokamak

Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

Funds: Supported by the National Natural Science Foundation of China ( Nos. 10875149, 10928509 and 10805057) and the National Magnetic Confinement Fusion Science Program of China ( No 2010GB105004).

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Received Date: November 08, 2010

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Abstract

Abstract

The efficiency of lower hybrid current drive (LHCD) for limiter and divertor configurations in the EAST tokamak is investigated using hot electrical conductivity theory and experimental formulas. The results indicate that the efficiency of current drive in a divertor geometry is slightly higher than that in a 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 × 10¹⁹m^–3.
- LHCD,
- CD efficiency,
- configuration,
- transformer recharging

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