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

作　　者：Bo-Wen Zheng Wei Zhang Tong-Yu Wu Si-Cheng Huang Yi-Po Zhang Xiu-Feng Xu Shi-Biao Tang Ze-Jie Yin 

机构地区：[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

出　　处：《Nuclear Science and Techniques》2019年第12期22-30,共9页核技术（英文）

基　　金：partially supported by the National Science and Technology Major Project of Ministry of Science and Technology of China(Nos.2014GB109003 and 2015GB111002);the National Natural Science Foundation of China(Nos.11375195,11575184,11375004,and 11775068)

摘　　要：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-γ 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.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-γdiscrimination 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.

关 键 词：Time-of-light NEUTRON SPECTROMETER GEANT4 HL-2M 

分 类 号：O57[理学—粒子物理与原子核物理]