# 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 ›› 2019, Vol. 30 ›› Issue (12): 175

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

### Development of the real-time double-ring fusion neutron time-of-flight spectrometer system at HL-2M

Bo-Wen Zheng1,2 • Wei Zhang1,2 • Tong-Yu Wu1,2 • Si-Cheng Huang1,2 • Yi-Po Zhang3 • Xiu-Feng Xu1,2 • Shi-Biao Tang1,2 • Ze-Jie Yin1,2

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 Southwestern Institute of Physics, Chengdu 610041, China
• Received:2019-09-03 Revised:2019-10-08 Accepted:2019-10-13
• Contact: Bo-Wen Zheng E-mail:myzbw@mail.ustc.edu.cn
• Supported by:
This work was partially supported by the National Science and Technology Major Project of Ministry of Science and Technology of China (Nos. 2014GB109003 and 2015GB111002) and the National Natural Science Foundation of China (Nos. 11375195, 11575184, 11375004, and 11775068).
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Bo-Wen Zheng, Wei Zhang, Tong-Yu Wu, Si-Cheng Huang, Yi-Po Zhang, Xiu-Feng Xu, Shi-Biao Tang, Ze-Jie Yin. Development of the real-time double-ring fusion neutron time-of-flight spectrometer system at HL-2M.Nuclear Science and Techniques, 2019, 30(12): 175
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Abstract: A real-time double-ring neutron time-of-flight (TOFII) spectrometer system has been proposed to achieve plasma diagnosis on HL-2M tokamak with a relatively high count rate and sufficient energy resolution. The TOFII system is in its development stage, and this work describes its characteristics in terms of design principle, system structure, electronic system design, preliminary tests, and neutron transport simulation. The preliminary test results illustrate that the TOFII system can demonstrate the realtime dynamic spectrum every 10 ms. The results also show that based on the support vector machine method, the n–c discrimination algorithm achieves the discrimination accuracy of 99.1% with a figure of merit of 1.30, and the intrinsic timing resolution of the system is within 0.3%. The simulated flight time spectrums from 1 to 5 MeV are obtained through the Monte Carlo tool Geant4, which also provide the reasonable results. The TOFII system will then be calibrated on mono-energetic neutron sources for further verification.