Development of an arch antenna for LHCD in a spherical tokamak

Nuclear Fushion

article

Yaoyao Wang¹  Qing Zhou²  Zhenxing Wang²  Wendong Ma³  Chengzhou Liu³  Jiafang Shan³ 

[1] Department of Engineering, Anhui Agricultural University;The Institute of Hebei Key Laboratory of Compact Fusion and ENN Science and Technology Development Co., Ltd;The Institute of Plasma Physics, Chinese Academy of Sciences

关键词: spherical tokamak;    2.45 GHz;    refraction parallel index;    plasma current;   

DOI  :  10.1088/1741-4326/acc343

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

A lower-hybrid frequency surface wave antenna called arch is designed and fabricated in this paper for the spherical tokamak named EXL-50. It is used to drive plasma current and heat plasma at 2.45 GHz. The arch antenna consists of 27 antenna elements. The left and right rectangular waveguides integrated with the antenna are used for microwave input and output, respectively. The refraction parallel index of this proposed antenna is 4.3 , which is favorable for the lower hybrid current drive. The measurement results in the absence of plasma show that the reflection and transmission coefficients (S11and S21 ) are - 12.5;{ext{dB}}and - 12.6,{ext{dB}} , respectively. The antenna was installed and tested on EXL-50. Up to a 35{ext{ kA}}plasma current was achieved using the arch antenna with a microwave of 70{ext{ kW}} .

【 授权许可】

Unknown