EAST装置上远红外激光干涉仪密度测量的改进  

Improved density measurement by FIR laser interferometer on EAST tokamak

作　　者：沈洁[1] 揭银先[1] 刘海庆[1] 魏学朝[1] 王正兴[1] 高翔[1,2] 

机构地区：[1]中国科学院等离子体物理研究所,合肥230031 [2]中国科学技术大学,合肥230026

出　　处：《核聚变与等离子体物理》2013年第3期244-250,共7页Nuclear Fusion and Plasma Physics

基　　金：国家自然科学基金资助项目(11075179;11275234;11105184);ITER计划专项支持(2012GB101002)

摘　　要：三道远红外激光干涉仪被用来测量EAST托卡马克装置中的弦平均电子密度。干涉仪装置中需要探测器具有高灵敏度、信噪比高、体积小及工作状态稳定等性质。采用肖特基势垒二极管探测器代替原有的热释电探测器(TGS)可以使HCN信号的信噪比大大改善。在EAST放电过程中,低杂波加热会干扰探测器接收到的信号,使用双层铜箔屏蔽和加窄带通滤波等方法可以有效防止低杂波对信号的干扰。改进后的探测器已经有效测出长脉冲放电和H模放电中等离子弦平均密度。A three-channel far-infrared （FIR） HCN laser interferometer has been developed to measure the line averaged electron density on EAST tokamak. Detectors with the properties of high sensitivity, high signal-to-noise ratio, small volume and stability are needed in interferometer device. The application of new Schottky barrier diode （SBD） detector has made the density signal and the signal-to-noise ratio greatly improved. The disturbance caused by the lower hybrid wave can be eliminated by using double copper foil shield and narrow band pass filter. The improved detectors have worked well during the long pulse discharge and H mode discharge.

关 键 词：远红外激光干涉仪 肖特基势垒探测器 电子密度 

分 类 号：TL657[核科学技术—核技术及应用]