Microwave Doppler reflectometer system in the Experimental Advanced Superconducting Tokamak.
Microwave Doppler reflectometer system in the Experimental Advanced Superconducting Tokamak.
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DOI：
10.1063/1.4825344
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发表时间：
2013-10
期刊：
影响因子：
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通讯作者：
C. Zhou;A. Liu;X. H. Zhang;J. Q. Hu;M. Y. Wang;H. Li;T. Lan;J. Xie;X. Sun;W. Ding-W.-Di
中科院分区：
文献类型：
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作者：
C. Zhou;A. Liu;X. H. Zhang;J. Q. Hu;M. Y. Wang;H. Li;T. Lan;J. Xie;X. Sun;W. Ding-W.-Di
最近在实验先进超导托卡马克（EAST）上安装了多普勒反射计系统。它包括两个分离的系统，一个用于q波段（33-50 GHz），另一个用于v波段（50-75 GHz）。光学系统由平面反射镜和抛物面反射镜组成，经过优化，提高了光谱分辨率。用合成器作为信号源，用20 MHz单频段调制器得到差动频率，用于外差检测。射线追踪模拟计算了散射位置和垂直波数。在EAST的最后一次实验中，获得了多普勒频移信号，计算了垂直传播速度在l模和h模下的径向分布。
A Doppler reflectometer system has recently been installed in the Experimental Advanced Superconducting (EAST) Tokamak. It includes two separated systems, one for Q-band (33-50 GHz) and the other for V-band (50-75 GHz). The optical system consists of a flat mirror and a parabolic mirror which are optimized to improve the spectral resolution. A synthesizer is used as the source and a 20 MHz single band frequency modulator is used to get a differential frequency for heterodyne detection. Ray tracing simulations are used to calculate the scattering location and the perpendicular wave number. In EAST last experimental campaign, the Doppler shifted signals have been obtained and the radial profiles of the perpendicular propagation velocity during L-mode and H-mode are calculated.