Experimental Investigation of Lower Hybrid Wave Coupling in HT-7

作     者：KONG Erhua DING Bojiang ZHANG Ting QIN Yongliang SHAN Jiafang LIU Fukun LI Miaohui ZHANG Lei WANG Mao LIU Liang XU Handong JIA Hua WU Zege FENG Jianqiang ZHAO Lianmin YANG Yong 

作者机构：Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China School of Physics Hefei University of Technology Hefei 230009 China High Magnetic Field Laboratory Chinese Academy of Sciences Hefei 230031 China 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2013年第15卷第10期

页      面：989-995页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 082701[工学-核能科学与工程] 0827[工学-核科学与技术] 0702[理学-物理学] 

基　　金：supported by National Natural Science Foundation of China (Nos. 10875149  10928509  10805057  and 10905069)  the National Magnetic Confinement Fusion Science Program of China (Nos. 2010GB105003  2010GB105004)  and the Dean Foundation of the Hefei Institutes of Physical Science  Chinese Academy of Sciences 

主　　题：LH wave coupling plasma edge density phase difference ponderomotiveforce 

摘      要：Experiments on lower hybrid wave （LHW） coupling were investigated in the HT- 7 tokamak. Good coupling of LHW plasma has been demonstrated at different conditions in the HT-7 tokamak. Relevant results have proved that LHW-plasma coupling is affected by the phase difference between adjacent waveguides. Furthermore, the edge density around the grill and relevant coupling can be adjusted by changing the plasma line average density or the gap value between the LH grill and the last closed flux surfaces （LCFS）. It is found that the coupling of LHWs becomes poor when the edge density around the LH grill is large enough in the HT-7 tokamak, and that coupling remains good with a proper edge density. With increasing LHW power, it is also found that the reflection coefficients （RCs） increase due to non-linear effects under conditions of low edge recycling, but can decrease under high edge recycling. The edge density depends mainly on the competition between the ponderomotive force （PMF） and the edge recycling intensity in the HT-7 tokamak.