Real-Time Dynamic Spectrum Analysis for Plasma Electron Density and Faraday Rotation Angle Measurement on HL-2A

DING Baogang (丁宝钢); WU Jun (吴军); FAN Weiwei (范伟伟); WU Tongyu (吴彤宇); ZHOU Yan (周艳); YIN Zejie (阴泽杰)

doi:10.1088/1009-0630/17/12/20

Plasma Science and Technology > 2015 > 17(12): 1092-1096. > DOI: 10.1088/1009-0630/17/12/20

DING Baogang (丁宝钢), WU Jun (吴军), FAN Weiwei (范伟伟), WU Tongyu (吴彤宇), ZHOU Yan (周艳), YIN Zejie (阴泽杰). Real-Time Dynamic Spectrum Analysis for Plasma Electron Density and Faraday Rotation Angle Measurement on HL-2A[J]. Plasma Science and Technology, 2015, 17(12): 1092-1096. DOI: 10.1088/1009-0630/17/12/20

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Real-Time Dynamic Spectrum Analysis for Plasma Electron Density and Faraday Rotation Angle Measurement on HL-2A

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

Funds: supported by National Natural Science Foundation of China (Nos. 11375195 and 11275059) and the National Magnetic Confinement Fusion Science Program of China (Nos. 2013GB104003, 2014GB109001)

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Received Date: November 30, 2014

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Abstract

Abstract

Electron density and Faraday rotation angle are important physical parameters in nuclear fusion research. To measure them simultaneously, the three-wave polarimeter/interferometer diagnostic system is applied. Both the final probe output signal and the reference signal contain three frequency components. The time-varying phase difference curve of each frequency component can be measured by the Real-time Dynamic Spectrum Analysis (RDSA) method based on Field-Programmable Gate Array (FPGA). The phase difference precision is better than 0.1o and the real-time feedback delay is less than 1 ms, which satisfy the requirements of HL-2A.
- RDSA,
- phase difference,
- real-time,
- electron density,
- Faraday rotation angle

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References

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