First results of CO_(2) dispersion interferometer on EAST tokamak  

作　　者：刘郁阳 李维明 姚远 张耀 张家敏 连辉 洪博 王守信 揭银先 刘海庆 Yuyang LIU;Weiming LI;Yuan YAO;Yao ZHANG;Jiamin ZHANG;Hui LIAN;Bo HONG;Shouxin WANG;Yinxian JIE;Haiqing LIU(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;Institutes of Physical Science and Information Technology,Anhui University,Hefei 230031,People's Republic of China)

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]Institutes of Physical Science and Information Technology,Anhui University,Hefei 230031,People's Republic of China

出　　处：《Plasma Science and Technology》2024年第3期76-82,共7页等离子体科学和技术（英文版）

基　　金：supported by the Comprehensive Research Facility for Fusion Technology Program of China(No.2018-000052-7301-001228);the Major Special Science and Technology Project of Anhui Province(No.912188707023)。

摘　　要：A dispersion interferometer(DI)has been installed and operates on the Experimental Advanced Superconducting Tokamak(EAST).This DI system utilizes a continuous-wave 9.3μm CO_(2)laser source to measure line-averaged electron densities accurately.In contrast to conventional interferometers,the DI does not require substantial vibration isolations or compensating systems to reduce the impact of vibrations in the optical path.It also employs a ratio of modulation amplitudes,ensuring it remains immune to the variations in detected intensities.Without a variation compensation system,the DI system on EAST reaches a density resolution of less than1.8×10^(-2)πrad and a temporal resolution of 20μs.The measurements made by the POlarimeterINTerferometer(POINT)system and the far-infrared hydrogen cyanide(HCN)interferometer are remarkably consistent with the DI’s results.The possibility of fringe jumps and the impact of refraction in high-density discharge can be significantly decreased using a shorter wavelength laser source.A rapid density change of 3×10^(19)m^(-3)during 0.15 s has been measured accurately in shot No.114755 of EAST.Additionally,the DI system demonstrates dependability and stability under 305 s long-pulse discharges in shot No.122054.

关 键 词：dispersion interferometer(DI) electron density plasma diagnostics Experimental Advanced Superconducting Tokamak(EAST) 

分 类 号：TL631.24[核科学技术—核技术及应用]