# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2020, Vol. 31 ›› Issue (9): 94

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

### 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

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1. 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
• Received:2019-10-24 Revised:2020-07-13 Accepted:2020-07-17
• Contact: Xiu-Feng Xu E-mail:xuxf@mail.ustc.edu.cn
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Ren-Jie Zhu, Xiang Zhou, Zi-Hao Liu, Wen-Di Wang, Xiao-Li Mou, Teng-Fei Fang, Qing-Li Ma, Xiu-Feng Xu, Guo-Liang Yuan, Li Zhao, Ling-Feng Wei, Ze-Jie Yin . High-precision and wide-range real-time neutron flux monitor system through multipoint linear calibration.Nuclear Science and Techniques, 2020, 31(9): 94
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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 different nuclear reaction periods, neutron fluxes span over seven decades, thereby requiring electronic devices to operate in counting and Campbelling modes simultaneously. 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 measurement range of neutron flux is implemented using realtime multipoint linear calibration. It can automatically 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, temporal resolution of 1 ms, and maximal relative error of 4% measured at the signal-to-noise ratio of 15.8 dB. Additionally, the NFM system is verified in a field experiment involving HL-2A, and the measured neutron flux is consistent with the results.