Research on the real-time signal conditioning method for dispersion interferometer in HL-2M

Wei ZHANG (张伟); Tongyu WU (吴彤宇); Jian ZHANG (张健); Zejie YIN (阴泽杰); Yan ZHOU (周艳)

doi:10.1088/2058-6272/abb078

Plasma Science and Technology > 2020 > 22(11): 115601. > DOI: 10.1088/2058-6272/abb078

Wei ZHANG (张伟), Tongyu WU (吴彤宇), Jian ZHANG (张健), Zejie YIN (阴泽杰), Yan ZHOU (周艳). Research on the real-time signal conditioning method for dispersion interferometer in HL-2M[J]. Plasma Science and Technology, 2020, 22(11): 115601. DOI: 10.1088/2058-6272/abb078

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Research on the real-time signal conditioning method for dispersion interferometer in HL-2M

¹College of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
² State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, People's Republic of China
³ Department of Modern Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China
⁴ Southwestern Institute of Physics, Chengdu 610041, People's Republic of China

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Received Date: April 27, 2020
Revised Date: August 01, 2020
Accepted Date: August 17, 2020

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Abstract

Abstract

A new CO₂ laser dispersion interferometer has been developed in the HL-2M tokamak to measure the electron density. In order to meet the needs of high-precision measurement, a data acquisition system with real-time signal conditioning (RSC) method is proposed. It can eliminate part of the impacts of environmental factors, such as mechanical vibration, light path changes, and plasma refraction effect during experiments. In harsh environments, the system can measure the line-integrated density with a high precision of 2 × 10¹⁸ m⁻² with the RSC method. The system has been tested in a recent HL-2A experimental campaign, and the results show that the RSC method plays an important role in the plasma electron density measurement.
- signal conditioning,
- electron density,
- dispersion interferometer,
- HL-2M

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Research on the real-time signal conditioning method for dispersion interferometer in HL-2M