Ray Tracing for Doppler Backscattering System in the Experimental Advanced Superconducting Tokamak

ZHOU Chu (周楚); LIU Adi (刘阿娣); HU Jianqiang (胡建强); WANG Mingyuan (王明远); ZHANG Xiaohui (张小辉); LI Hong (李弘); YU Changxuan (俞昌旋); LIU Wandong (刘万东); LAN Tao (兰涛); XIE Jinlin (谢锦林)

doi:10.1088/1009-0630/17/9/02

Plasma Science and Technology > 2015 > 17(9): 728-732. > DOI: 10.1088/1009-0630/17/9/02

ZHOU Chu (周楚), LIU Adi (刘阿娣), HU Jianqiang (胡建强), WANG Mingyuan (王明远), ZHANG Xiaohui (张小辉), LI Hong (李弘), YU Changxuan (俞昌旋), LIU Wandong (刘万东), LAN Tao (兰涛), XIE Jinlin (谢锦林). Ray Tracing for Doppler Backscattering System in the Experimental Advanced Superconducting Tokamak[J]. Plasma Science and Technology, 2015, 17(9): 728-732. DOI: 10.1088/1009-0630/17/9/02

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Ray Tracing for Doppler Backscattering System in the Experimental Advanced Superconducting Tokamak

CAS Key Laboratory of Geospace Environment, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

Funds: supported by National Natural Science Foundation of China (Nos. 10990211 and 11105146) and the ITER-CN Project, 973 Program of China (No. 2013GB106002)

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Received Date: September 14, 2014

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Abstract

The Doppler backscattering system has been widely used for turbulence measure?ments, and the microwave beam will be backscattered near the cut-o? layer when the Brag con?dition is fulfilled. In tokamak, the ray-tracing code is used to obtain the radial position and perpendicular wave number of the scattering layer for turbulence velocity measurement and the WKB (Wentzel-Kramers-Brillouin) approximation should be satisfied for optical propagation. To calculate the backscattering location and wave number at the cut-o? layer only, a single ray tracing in the cross section is enough, while for spatial and wave number resolution calculation, multiple rays reflecting the microwave beam size should be used. Considering the angle between the wave vector and the magnetic field, a three-dimension quasi-optical Gaussian ray tracing is sometimes needed.
- Doppler backscattering system,
- ray tracing,
- wave number resolution,
- pitch angle

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Ray Tracing for Doppler Backscattering System in the Experimental Advanced Superconducting Tokamak