Research on the Real-Time Phase Jump Process Method for Plasma  Electron Density Measurement in HL-2A Tokamak

DING Baogang (丁宝钢); CHEN Chao (陈超); WANG Wendi (王闻迪); WU Tongyu (吴彤宇); ZHOU Yan (周艳); YIN Zejie (阴泽杰)

doi:10.1088/1009-0630/17/10/05

Plasma Science and Technology > 2015 > 17(10): 837-841. > DOI: 10.1088/1009-0630/17/10/05

DING Baogang (丁宝钢), CHEN Chao (陈超), WANG Wendi (王闻迪), WU Tongyu (吴彤宇), ZHOU Yan (周艳), YIN Zejie (阴泽杰). Research on the Real-Time Phase Jump Process Method for Plasma Electron Density Measurement in HL-2A Tokamak[J]. Plasma Science and Technology, 2015, 17(10): 837-841. DOI: 10.1088/1009-0630/17/10/05

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Research on the Real-Time Phase Jump Process Method for Plasma Electron Density Measurement in HL-2A Tokamak

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

Funds: supported by National Natural Science Foundation of China (Nos. 11375195, 11275059) and the National Magnetic Confinement Fusion Science Program of China (No. 2013GB104003)

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Received Date: December 13, 2014

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Abstract

Abstract

In the real-time plasma electron density measurement using far infrared (FIR) laser interferometry, the plasma electron density can be calculated by measuring the real time phase difference between the reference signal and the probe signal. A novel Real-time Phase Jump Pro?cess (RPJP) method is applied to the HL-2A tokamak. With this method, the phase difference precision is up to fringe 1/3600 fringe (1 fringe is equal to a phase shift of 2π), and the dynamic measure?ment range is extensible 65536 fringes. The time resolution of the phase di?erence is 80 ns, while the feedback delay is 180 μs.
- RPJP,
- FPGA,
- fringe,
- real-time,
- electron density

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References (1)

References

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