X-Mode Frequency Modulated Density Profile Reflectometer on EAST Tokamak  

作　　者：张重阳 刘阿娣 李弘 李斌 周楚 张小辉 胡健强 谢锦林 兰涛 刘万东 俞昌旋 

机构地区：[1]CAS Key Laboratory of Geospace Environment,Department of Modern Physics,University of Science and Technology of China

出　　处：《Plasma Science and Technology》2013年第9期857-862,共6页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.10990211,10835009 and 11105146);the ITER Domestic Program of China(Nos.2010GB107000,2013GB106002);Fundamental Research Funds for the Central Universities(No.WK2030040026)

摘　　要：An extraordinary-mode （X-mode） frequency-modulated continuous-wave （FMCW） profile reflectometer has been built on EAST. In the reflectometer, continuous waves with fre- quency sweeping from 12.5 GHz to 18 GHz were generated through a Hyperabrupt Tuned-varactor Oscillator （HTO） source and a four times active multiplier was used to increase the frequency to V-band （50 GHz to 72 GHz）. The polarization of horn lens antenna is perpendicular to the mag- netic field line at the edge plasmas. According to the V-band frequency range and polarization, the system cover density range from 0.5 x 1019m-3 to 3.0 x 1019m-3 （when toroidal magnetic field is 1.8 T）, with time resolution of 12.5 ~ 50 #s. The density profile could be calculated by assuming the edge profile through an empirical equation. The maximum spatial error deduced by the method is about 4 cm. This reflectometer has been successfully applied in 2010 autumn EAST campaign, the temporal evolution of density profiles was acquired during the low confine- ment mode to high confinement mode transition. The density pedestal of EAST Tokamak was observed and the top value and gradient of the density pedestal were estimated.An extraordinary-mode （X-mode） frequency-modulated continuous-wave （FMCW） profile reflectometer has been built on EAST. In the reflectometer, continuous waves with fre- quency sweeping from 12.5 GHz to 18 GHz were generated through a Hyperabrupt Tuned-varactor Oscillator （HTO） source and a four times active multiplier was used to increase the frequency to V-band （50 GHz to 72 GHz）. The polarization of horn lens antenna is perpendicular to the mag- netic field line at the edge plasmas. According to the V-band frequency range and polarization, the system cover density range from 0.5 x 1019m-3 to 3.0 x 1019m-3 （when toroidal magnetic field is 1.8 T）, with time resolution of 12.5 ~ 50 #s. The density profile could be calculated by assuming the edge profile through an empirical equation. The maximum spatial error deduced by the method is about 4 cm. This reflectometer has been successfully applied in 2010 autumn EAST campaign, the temporal evolution of density profiles was acquired during the low confine- ment mode to high confinement mode transition. The density pedestal of EAST Tokamak was observed and the top value and gradient of the density pedestal were estimated.

关 键 词：ceflectometer electron density H-MODE CDM 

分 类 号：TL631.24[核科学技术—核技术及应用]