用远红外HCN激光干涉仪测量等离子体电子密度

FIR HCN Laser Interferometer for Electron Density Measurements

在大多数托克马克（ＴＯＫＡＭＡＫ）上，远红外激光干涉仪是等离子体诊断中一种重要的装置。本文介绍了用远红外ＨＣＮ激光干涉仪测量等离子体电子密度的原理和激光干涉仪结构，并给出首次在我国第一台大型超导托克马克ＨＴΑ７装置上测到的中心弦等离子体电子平均密度。干涉仪的光源是一台腔长３．４ｍ、连续辉光放电的ＨＣＮ激光器，波长３３７μｍ，输出功率１００ｍＷ，测量的时间分辨率为１００μｓ。

FIR laser interferometry has become a standard diagnostic method for electron density measurements on most tokamaks.The principle of interferometry for determining electron density of plasma is introduced.The structure of the interferometer,The first large superconductive tokamak in China,and its measurement results,are described.A HCN laser is used as the light source with 3.4m cavity length,100mW output power and 100μs temporal resolution.