FPGA implementation of 500-MHz high-count-rate high-time-resolution real-time digital neutron-gamma discrimination for fast liquid detectors  

作　　者：Hui‑Yin Shen Jing‑Long Zhang Jie Zhang Jian‑Hang Zhou 

机构地区：[1]College of Nuclear Technology and Automation Engineering,Chengdu University of Technology,Chengdu 610059,China [2]Southwestern Institute of Physics,P.O.Box 432,Chengdu 610041,China

出　　处：《Nuclear Science and Techniques》2024年第8期101-113,共13页核技术（英文）

基　　金：supported by the National Magnetic Confinement Fusion Program of China(No.2019YFE03020002);the National Natural Science Foundation of China(Nos.12205085 and12125502)。

摘　　要：Fast neutron flux measurements with high count rates and high time resolution have important applications in equipment such as tokamaks.In this study,real-time neutron and gamma discrimination was implemented on a self-developed 500-Msps,12-bit digitizer,and the neutron and gamma spectra were calculated directly on an FPGA.A fast neutron flux measurement system with BC-501A and EJ-309 liquid scintillator detectors was developed and a fast neutron measurement experiment was successfully performed on the HL-2 M tokamak at the Southwestern Institute of Physics,China.The experimental results demonstrated that the system obtained the neutron and gamma spectra with a time accuracy of 1 ms.At count rates of up to 1 Mcps,the figure of merit was greater than 1.05 for energies between 50 keV and 2.8 MeV.

关 键 词：Neutron-gamma discrimination Liquid scintillation detector Real-time spectrum analyzer 

分 类 号：TL81[核科学技术—核技术及应用] TN791[电子电信—电路与系统]