Research on the phase adjustment method for dispersion interferometer on HL-2A tokamak

Tongyu WU (吴彤宇); Wei ZHANG (张伟); Haoxi WANG (王浩西); Yan ZHOU (周艳); Zejie YIN (阴泽杰)

doi:10.1088/2058-6272/aaaa19

Plasma Science and Technology > 2018 > 20(6): 65601-065601. > DOI: 10.1088/2058-6272/aaaa19

Tongyu WU (吴彤宇), Wei ZHANG (张伟), Haoxi WANG (王浩西), Yan ZHOU (周艳), Zejie YIN (阴泽杰). Research on the phase adjustment method for dispersion interferometer on HL-2A tokamak[J]. Plasma Science and Technology, 2018, 20(6): 65601-065601. DOI: 10.1088/2058-6272/aaaa19

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Research on the phase adjustment method for dispersion interferometer on HL-2A tokamak

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 Southwestern Institute of Physics, Chengdu 610041, People’s Republic of China

Funds: This work is supported by the National Magnetic Confinement Fusion Science Program of China (Nos. 2014GB109001 and 2013GB104003), National Natural Science Foundation of China (Grant Nos. 11375195, 11505053, and 11575184).

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Received Date: November 21, 2017

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Abstract

Abstract

A synchronous demodulation system is proposed and deployed for CO₂ dispersion interferometer on HL-2A, which aims at high plasma density measurements and real-time feedback control. In order to make sure that the demodulator and the interferometer signal are synchronous in phase, a phase adjustment (PA) method has been developed for the demodulation system. The method takes advantages of the field programmable gate array parallel and pipeline process capabilities to carry out high performance and low latency PA. Some experimental results presented show that the PA method is crucial to the synchronous demodulation system and reliable to follow the fast change of the electron density. The system can measure the line-integrated density with a high precision of 2.0×10¹⁸ m⁻².
- plasma diagnosis,
- FPGA,
- real-time,
- electron density

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Research on the phase adjustment method for dispersion interferometer on HL-2A tokamak