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

The Doppler backscattering system has been widely used for turbulence measurements,and the microwave beam will be backscattered near the cut-off layer when the Brag condition is fulfilled.In tokamak,the ray-tracing code is used to obtain the radial position and perpendicular wave number of the scatt...

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Bibliographic Details
Published inPlasma science & technology Vol. 17; no. 9; pp. 728 - 732
Main Author 周楚 刘阿娣 胡建强 王明远 张小辉 李弘 俞昌旋 刘万东 兰涛 谢锦林
Format Journal Article
LanguageEnglish
Published 01.09.2015
Subjects
Backscattering
Beams (radiation)
Cut-off
Doppler effect
Mathematical analysis
Ray tracing
Turbulent flow
Wavelengths
后向散射
实验性
射线跟踪
射线追踪
径向位置
散射层
超导托卡马克
速度测量
Online AccessGet full text
ISSN1009-0630
DOI10.1088/1009-0630/17/9/02

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Summary:The Doppler backscattering system has been widely used for turbulence measurements,and the microwave beam will be backscattered near the cut-off layer when the Brag condition 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-off 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.
Bibliography:Doppler backscattering system, ray tracing, wave number resolution, pitch angle
ZHOU Chu, LIU Adi , HU Jianqiang , WANG Mingyuan , ZHANG Xiaohui, LI Hong, YU Changxuan , LIU Wandong , LAN Tao , XIE Jinlin （1. CAS Key Laboratory of Geospace Environment, Department of Modern Physics University of Science and Technology of China, Hefei 230026, China）
34-1187/TL
The Doppler backscattering system has been widely used for turbulence measurements,and the microwave beam will be backscattered near the cut-off layer when the Brag condition 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-off 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.
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ISSN:1009-0630
DOI:10.1088/1009-0630/17/9/02