Development of a combined interferometer using millimeter wave solid state source and a far infrared laser on ENN's Xuan Long-50(EXL-50)  

作　　者：Jiaxing XIE Xuechao WEI Haiqing LIU Songjian LI Jibo ZHANG Yuan YAO Yunfei WANG Yinxian JIE 解家兴;魏学朝;刘海庆;李松健;张际波;姚远;王云飞;揭银先(Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,People’s Republic of China;University of Science and Technology of China,Hefei 230026,People’s Republic of China;ENN Science and Technology Development Co.,Ltd,Langfang 065001,People’s Republic of China;Interdisciplinary Graduate School of Engineering Sciences,Kyushu University,Kasuga 816-8580,Japan)

机构地区：[1]Institute of Plasma Physics,Hefei Institutes of Physical Science,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 [3]ENN Science and Technology Development Co.,Ltd,Langfang 065001,People’s Republic of China [4]Interdisciplinary Graduate School of Engineering Sciences,Kyushu University,Kasuga 816-8580,Japan

出　　处：《Plasma Science and Technology》2022年第6期23-31,共9页等离子体科学和技术（英文版）

基　　金：supported by the National MCF Energy R&D Program(Nos.2019YFE03040003 and 2017YFE0301205);supported in part by Key Program of Research and Development of Hefei Science Center,CAS(No.2019HSC-KPRD001);partly supported by the Collaborative Research Program of the Research Institute for Applied Mechanics,Kyushu University.

摘　　要：A millimeter wave solid state source—far infrared laser combined interferometer system(MFCI)consisting of a three-channel 890 GHz hydrogen cyanide(HCN)laser interferometer and a threechannel 340 GHz solid state source interferometer(SSI)is developed for real-time line-integrated electron density feedback and electron density profile of the EXL-50 spherical tokamak device.The interferometer system is a Mach–Zehnder type,with all probe-channels measured vertically,covering the plasma magnetic axis to the outermost closed magnetic plane.The HCN laser interferometer uses an HCN laser with a frequency of 890 GHz as a light source and modulates a100 k Hz beat signal by a rotating grating,giving a temporal resolution of 10μs.The SSI uses two independent 340 GHz solid-state diode sources as the light source,the frequency of the two sources is adjustable,and the temporal resolution of SSI can reach 1μs by setting the frequency difference of the two lasers at 1 MHz.The main optical path of the two interferometers is compactly installed on a set of double-layer optical platform directly below EXL-50.Dual optical path design using corner cube reflectors avoids the large support structures.Collinear the probebeams of two wavelengths,then the phase error caused by vibration can be compensated.At present,the phase noise of the HCN Interferometer is 0.08 rad,corresponding to a line-integrated electron density of 0.88×10^(17)m^(-2),one channel of measuring result was obtained by the MFCI system,and the highest density measured is about 0.7×10^(19)m^(-2).

关 键 词：plasma diagnostics—interferometry spectroscopy and imaging nuclear instruments and methods for hot plasma diagnostics 

分 类 号：TL631.24[核科学技术—核技术及应用]