Recent ICRF coupling experiments on EAST  

作　　者：杨宇晴 张新军 赵燕平 秦成明 程艳 毛玉周 杨桦 王健华 袁帅 王磊 琚松青 陈根 邓旭 张开 万宝年 李建刚 宋云涛 龚先祖 钱金平 张涛 

机构地区：[1]Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China [2]University of Science and Technology of China, Hefei 230026, People's Republic of China

出　　处：《Plasma Science and Technology》2018年第4期107-111,共5页等离子体科学和技术（英文版）

基　　金：National key Research and Development program (Grant Nos. 2016YFA0400600 and 2016YFA0400601);National Magnetic Confinement Fusion Science Programme (Grant Nos. 2015GB101001 and 2013GB106001B);National Natural Science Foundation of China under Grant Nos. 11375235, 11675213 and 11375236;JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC no. 11261140328)

摘　　要：Recent ion cyclotron resonance frequency（ICRF） coupling experiments for optimizing ICRF heating in high power discharge were performed on EAST. The coupling experiments were focus on antenna phasing and gas puffing, which were performed separately on two ports of the ion cyclotron resonance heating（ICRH） system of EAST. The antenna phasing was performed on the I-port antenna, which consists of four toroidally spaced radiating straps operating in multiple phasing cases; the coupling performance was better under low wave number ∣k;∣（ranging from 4.5 to 6.5）. By fuelling the plasma from gas injectors, placed as uniformly spaced array from top to bottom at each side limiter of the B-port antenna, which works in dipole phasing, the coupling resistance of the B-port antenna increased obviously.Furthermore, the coupling resistance of the I-port antenna was insensitive to a smaller rate of gas puffing but when the gas injection rate was more than a certain value(>1021 s;), a sharp increase in the coupling resistance of the I-port antenna occurred, which was mainly caused by the toroidal asymmetric boundary density arising from gas puffing. A more specific analysis is given in the paper.Recent ion cyclotron resonance frequency(ICRF) coupling experiments for optimizing ICRF heating in high power discharge were performed on EAST. The coupling experiments were focus on antenna phasing and gas puffing, which were performed separately on two ports of the ion cyclotron resonance heating(ICRH) system of EAST. The antenna phasing was performed on the I-port antenna, which consists of four toroidally spaced radiating straps operating in multiple phasing cases; the coupling performance was better under low wave number ∣k_‖∣(ranging from 4.5 to 6.5). By fuelling the plasma from gas injectors, placed as uniformly spaced array from top to bottom at each side limiter of the B-port antenna, which works in dipole phasing, the coupling resistance of the B-port antenna increased obviously.Furthermore, the coupling resistance of the I-port antenna was insensitive to a smaller rate of gas puffing but when the gas injection rate was more than a certain value(>1021 s^(-1)), a sharp increase in the coupling resistance of the I-port antenna occurred, which was mainly caused by the toroidal asymmetric boundary density arising from gas puffing. A more specific analysis is given in the paper.

关 键 词：EAST ICRF antenna–plasma coupling antenna phasing and gas puffing 

分 类 号：TL631.24[核科学技术—核技术及应用]