Construction of an Hα diagnostic system and its application to determine neutral hydrogen densities on the Keda Torus eXperiment

作     者：Junfeng Zhu Tao Lan Ge Zhuang Tijian Deng Jie Wu Hangqi Xu Chen Chen Sen Zhang Jiaren Wu Yiming Zu Hong Li Jinlin Xie Ahdi Liu Zixi Liu Zhengwei Wu Hai Wang Xiaohui Wen Haiyang Zhou Chijin Xiao Weixing Ding Wandong Liu 朱军锋;兰涛;庄革;邓体建;吴捷;许航齐;陈晨;张森;邬佳仁;祖一鸣;李弘;谢锦林;刘阿娣;刘子奚;吴征威;汪海;温晓辉;周海洋;肖持进;丁卫星;刘万东

作者机构：KTX Laboratory and Department of Engineering and Applied PhysicsUniversity of Science and Technology of ChinaHefei 230026China Plasma Physics LaboratoryUniversity of SaskatchewanSaskatoonSK S7N 5E2Canada 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2019年第28卷第10期

页      面：428-434页

核心收录：

学科分类：07[理学] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 080402[工学-测试计量技术及仪器] 070204[理学-等离子体物理] 0838[工学-公安技术] 0702[理学-物理学] 

基　　金：Project supported by the National Magnetic Confinement Fusion Science Program of China(Grant No.2017YFE0301700) the National Natural Science Foundation of China(Grant No.11635008) 

主　　题：Hα diagnostic neutral density Keda Torus eXperiment(KTX) device 

摘      要：A 10-channel Hα diagnostic system has been designed with the rapid response rate of 300 kHz, spatial resolution of about 40 mm, and overlap between adjacent channels of about 3%, and it has been implemented successfully on Keda Torus eXperiment(KTX), a newly constructed, reversed field pinch(RFP) experimental device at the University of Science and Technology of China(USTC). This diagnostic system is a very important tool for the initial KTX operations. It is compact,with an aperture slit replacing the traditional optical lens system. A flexural interference filter is designed to prevent the center wavelength from shifting too much as the increase of angle from vertical incidence. To eliminate the stray light,the interior of the system is covered with the black aluminum foil having a very high absorptivity. Using the Hαemission data, together with the profiles of electron temperature and density obtained from the Langmuir probe, the neutral density profiles have been calculated for KTX plasmas. The rapid response rate and good spatial resolution of this Hαdiagnostic system will be beneficial for many studies in RFP plasma physics.