Multichannel Microwave Interferometer for Simultaneous Measurement of Electron Density and its Fluctuation on HL-2A Tokamak

作     者：施培万 石中兵 陈伟 钟武律 杨曾辰 蒋敏 张博宇 李永高 于利明 刘泽田 丁玄同 

作者机构：Southwestern Institute of Physics Chengdu 610041 China Xihua University Chengdu 610039 China 

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

年 卷 期：2016年第18卷第7期

页      面：708-713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] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：supported by the National Magnetic Confinement Fusion Science Program of China(Nos.2013GB104002,2013GB107002,2014GB107001) National Natural Science Foundation of China(Nos.11475058,11475057,11261140326,11405049) 

主　　题：interferometer quadrature phase detection saturated internal kink mode 

摘      要：A nmltichannel microwave interferometer system has been developed on the HL- 2A tokomak. Its working frequency is well designed to avoid the fringe jump effect. Taking the structure of HL-2A into account, its antennas are installed in the horizontal direction, i.e. one launcher in high field side （HFS） and four receivers in low field side （LFS）. The fan-shaped measurement area covers those regions where the magnetohydrodynamics （MHD） instabilities are active. The heterodyne technique contributes to its high temporal resolution （1 μs）. It is possible for the multichannel system to realize simultaneous measurements of density and its fluctuation. The quadrature phase detection based on the zero-crossing method is introduced to density measureinent. With this system, reliable line-averaged densities and density profiles are obtained. The location of the saturated internal kink mode can be figured out from the mode showing different intensities on four channels, and the result agrees well with that measured by electron cyclotron emission imaging （ECEI）.