Multichannel Microwave Interferometer for Simultaneous Measurement of Electron Density and its Fluctuation on HL-2A Tokamak

SHI Peiwan (施培万); SHI Zhongbing (石中兵); CHEN Wei (陈伟); ZHONG Wulyu (钟武律); YANG Zengchen (杨曾辰); JIANG Min (蒋敏); ZHANG Boyu (张博宇); LI Yonggao (李永高); YU Liming (于利明); LIU Zetian (刘泽田); DING Xuantong (丁玄同)

doi:10.1088/1009-0630/18/7/02

Plasma Science and Technology > 2016 > 18(7): 708-713. > DOI: 10.1088/1009-0630/18/7/02

SHI Peiwan (施培万), SHI Zhongbing (石中兵), CHEN Wei (陈伟), ZHONG Wulyu (钟武律), YANG Zengchen (杨曾辰), JIANG Min (蒋敏), ZHANG Boyu (张博宇), LI Yonggao (李永高), YU Liming (于利明), LIU Zetian (刘泽田), DING Xuantong (丁玄同). Multichannel Microwave Interferometer for Simultaneous Measurement of Electron Density and its Fluctuation on HL-2A Tokamak[J]. Plasma Science and Technology, 2016, 18(7): 708-713. DOI: 10.1088/1009-0630/18/7/02

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Multichannel Microwave Interferometer for Simultaneous Measurement of Electron Density and its Fluctuation on HL-2A Tokamak

1Southwestern Institute of Physics, Chengdu 610041, China 2Xihua University, Chengdu 610039, China

Funds: supported by the National Magnetic Confinement Fusion Science Programs of China (Nos. 2013GB104002, 2013GB107002, 2014GB107001) and National Natural Science Foundation of China (Nos. 11475058, 11475057, 11261140326, 11405049)

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Received Date: September 29, 2015

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Abstract

Abstract

A multichannel microwave interferometer system has been developed on the HL-2A tokomak. Its working frequency is well designed to avoid the fringe jump effect. Taking the structure of HL-2A into account, its antennas are installed in the horizontal direction, i.e. one launcher in high ?eld side (HFS) and four receivers in low field side (LFS). The fan-shaped measurement area covers those regions where the magnetohydrodynamics (MHD) instabilities are active. The heterodyne technique contributes to its high temporal resolution (1 µs). It is possible for the multichannel system to realize simultaneous measurements of density and its fluctuation. The quadrature phase detection based on the zero-crossing method is introduced to density measurement. With this system, reliable line-averaged densities and density profiles are obtained. The location of the saturated internal kink mode can be figured out from the mode showing different intensities on four channels, and the result agrees well with that measured by electron cyclotron emission imaging (ECEI).
- interferometer,
- quadrature phase detection,
- saturated internal kink mode

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References

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