The Real-Time, High Precision Phase Difference Measurement of Electron Density in HL-2A Tokamak

DING Baogang (丁宝钢); WU Tongyu (吴彤宇); LI Shiping (李世平); ZHOU Yan (周艳); YIN Zejie (阴泽杰)

doi:10.1088/1009-0630/17/9/13

Plasma Science and Technology > 2015 > 17(9): 797-801. > DOI: 10.1088/1009-0630/17/9/13

DING Baogang (丁宝钢), WU Tongyu (吴彤宇), LI Shiping (李世平), ZHOU Yan (周艳), YIN Zejie (阴泽杰). The Real-Time, High Precision Phase Difference Measurement of Electron Density in HL-2A Tokamak[J]. Plasma Science and Technology, 2015, 17(9): 797-801. DOI: 10.1088/1009-0630/17/9/13

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The Real-Time, High Precision Phase Difference Measurement of Electron Density in HL-2A Tokamak

1State Key Laboratory of Particle Detection and Electronics, University of Science andTechnology 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, 11075048) and the National Magnetic Confinement Fusion Science Program of China (No. 2013GB104003)

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Received Date: October 29, 2014

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Abstract

Abstract

This paper introduces a real-time high precision measurement of phase difference based on Field Programmable Gate Array (FPGA) technology, which has been successfully applied to laser grating interference measurement and real-time feedback of plasma electron density in HL-2A tokamak. It can track the changes of electron density while setting the starting point of the density curve to zero. In a laboratory test, the measuring accuracy of phase difference is less than 0.1?, the time resolution is 80 ns, and the feedback delay is 180 μs.
- phase difference,
- HL-2A,
- FPGA, real-time,
- high precision

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References (17)

References

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