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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
Citation: 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

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

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
  • 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.
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