High-precision and wide-range real-time neutron flux monitor system through multipoint linear calibration
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High-precision and wide-range real-time neutron flux monitor system through multipoint linear calibration Ren-Jie Zhu1,2 • Xiang Zhou1,2 • Zi-Hao Liu1,2 • Wen-Di Wang1,2 • Xiao-Li Mou4 • Teng-Fei Fang1,2 • Qing-Li Ma5 • Xiu-Feng Xu1,2 • Guo-Liang Yuan3 Li Zhao3 • Ling-Feng Wei3 • Ze-Jie Yin1,2
•
Received: 24 October 2019 / Revised: 13 July 2020 / Accepted: 17 July 2020 China Science Publishing & Media Ltd. (Science Press), Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Chinese Nuclear Society and Springer Nature Singapore Pte Ltd. 2020
Abstract The neutron flux monitor (NFM) system is an important diagnostic subsystem introduced by large nuclear fusion devices such as international thermonuclear experimental reactor (ITER), Japan torus-60, tokamak fusion test reactor, and HL-2A. Neutron fluxes can provide real-time parameters for nuclear fusion, including neutron source intensity and fusion power. Corresponding to different nuclear reaction periods, neutron fluxes span over seven decades, thereby requiring electronic devices to operate in counting and Campbelling modes simultaneously. Therefore, it is crucial to design a real-time NFM system to encompass such a wide dynamic range. In this study, a high-precision NFM system with a wide measurement range of neutron flux is implemented using realtime multipoint linear calibration. It can automatically
This work was supported by the National Natural Science Foundation of China (Nos. 11475131, 11975307, and 11575184) and the National Magnetic Confinement Fusion Energy Development Research (No. 2013GB104003). & Xiu-Feng Xu [email protected] 1
State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
2
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
3
Center for Fusion Science of Southwestern Institute of Physics, Chengdu 610041, China
4
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
5
College of Electronic Engineering, National University of Defense Technology, Hefei 230037, China
switch between counting and Campbelling modes with variations in the neutron flux. We established a testing platform to verify the feasibility of the NFM system, which can output the simulated neutron signal using an arbitrary waveform generator. Meanwhile, the accurate calibration interval of the Campbelling mode is defined well. Based on the above-mentioned design, the system satisfies the requirements, offering a dynamic range of 108 cps, temporal resolution of 1 ms, and maximal relative error of 4% measured at the signal-to-noise ratio of 15.8 dB. Additionally, the NFM system is verified in a field experiment involving HL-2A, and the measured neutron flux is consistent with the results. Keywords Multipoint linear calibration Real time Simulated neutron signal Neutron flux monitoring ITER HL-2A
1 Introduction ITER
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