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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| Published in | Plasma science & technology Vol. 17; no. 9; pp. 728 - 732 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
01.09.2015
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1009-0630 |
| DOI | 10.1088/1009-0630/17/9/02 |
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| Abstract | 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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| AbstractList | 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. 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. |
| 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 |
| AuthorAffiliation | CAS Key Laboratory of Geospace Environment, Department of Modern Physics,University of Science and Technology of China, Hefei 230026, China |
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| Cites_doi | 10.1088/1009-0630/11/2/03 10.1063/1.2953675 10.1088/0741-3335/46/4/002 10.1063/1.860782 10.1063/1.870721 10.1063/1.4825344 10.1088/0029-5515/46/9/S16 10.1103/PhysRev.126.1899 |
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| Notes | 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. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
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| References | Jinping Qian (6) 2009; 11 11 1 Troster C (2) 2008 12 Guosheng Xu (4) 2011; 51 Happel T (7) 2010 Honore C (3) 2006; 46 Hirsch M (9) 2004; 46 Stix T H (5) 1992 8 10 |
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| Snippet | 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... The Doppler backscattering system has been widely used for turbulence measurements, and the microwave beam will be backscattered near the cut-off layer when... |
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| SubjectTerms | 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 |
| Title | Ray Tracing for Doppler Backscattering System in the Experimental Advanced Superconducting Tokamak |
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