A precision control method for plasma electron density and Faraday rotation angle measurement on HL-2A

Wei ZHANG (张伟); Tongyu WU (吴彤宇); Baogang DING (丁宝钢); Yonggao LI (李永高); Yan ZHOU (周艳); Zejie YIN (阴泽杰)

doi:10.1088/2058-6272/aa64cd

Plasma Science and Technology > 2017 > 19(7): 75603-075603. > DOI: 10.1088/2058-6272/aa64cd

Wei ZHANG (张伟), Tongyu WU (吴彤宇), Baogang DING (丁宝钢), Yonggao LI (李永高), Yan ZHOU (周艳), Zejie YIN (阴泽杰). A precision control method for plasma electron density and Faraday rotation angle measurement on HL-2A[J]. Plasma Science and Technology, 2017, 19(7): 75603-075603. DOI: 10.1088/2058-6272/aa64cd

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A precision control method for plasma electron density and Faraday rotation angle measurement on HL-2A

1 State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, People’s Republic of China
2 Department of Modern Physics, University of Science and Technology of China, Hefei 230026, People’s Republic of China
3 Shanghai Radio Equipment Research Institute, Shanghai 200090, People’s Republic of China
4 Southwestern Institute of Physics, Chengdu 610041, People’s Republic of China

Funds: This work was supported by National Natural Science
Foundation of China (Nos. 11375195, 11575184 and
11275059) and National Magnetic Confinement Fusion
Energy Development Research (Nos. 2013GB104003 and
2014GB109001).

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Abstract

Abstract

The precision of plasma electron density and Faraday rotation angle measurement is a key indicator for far-infrared laser interferometer/polarimeter plasma diagnosis. To improve the precision, a new multi-channel high signal-to-noise ratio HCOOH interferometer/polarimeter has been developed on the HL-2A tokamak. It has a higher level requirement for phase demodulation precision. This paper introduces an improved real-time fast Fourier transform algorithm based on the field programmable gate array, which significantly improves the precision. We also apply a real-time error monitoring module (REMM) and a stable error
inhibiting module (SEIM) for precision control to deal with the weak signal. We test the interferometer/polarimeter system with this improved precision control method in plasma discharge experiments and simulation experiments. The experimental results confirm that the plasma electron density precision is better than 1/3600 fringe and the Faraday rotation angle measurement precision is better than 1/900 fringe, while the temporal resolution is 80 ns. This performance can fully meet the requirements of HL-2A.
- precision control,
- far-infrared laser,
- phase difference,
- HL-2A

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