Design of Q-band FMCW reflectometry for electron density profile measurement on the Joint TEXT tokamak

作     者：万凌寒 杨州军 周若冰 潘晓明 张弛 谢先立 阮博文 

作者机构：State Key Laboratory of Advanced Electromagnetic Engineering and TechnologyHuazhong University of Science and TechnologyWuhan 430074People's Republic of China 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2017年第19卷第2期

页      面：101-107页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 082701[工学-核能科学与工程] 0827[工学-核科学与技术] 0702[理学-物理学] 

基　　金：supported by the National Magnetic Confinement Fusion Energy Research Project(No.2014GB108001 and No.2015GB120003) Fundamental Research Funds for the Central Universities of China,Huazhong University of Science and Technology(Grant No.2015TS010) 

主　　题：reflectometry density plasma diagnostics 

摘      要：The Q-band （33-50 GHz） fast sweep frequency modulated continuous wave （FMCW） reflectometry has been recently developed for electron density profile measurement on the Joint TEXT tokamak. It operates in ordinary mode （O-mode） with a 20 μs sweeping period, covering the density range from 1 × 10^19m 3 to 3 × 10^19m-3. On the bench test, a Yttrium Iron Garnet （YIG） filter is used for the dynamic calibration of the voltage controlled oscillator （VCO） to obtain a linear frequency sweep. Besides, the use of a power combiner helps to improve the sideband suppression level of the single side-band modulator （SSBM）. The reconstructed density profiles are presented, which demonstrate the capability of the reflectometry.