用于中子能谱测量的反冲质子磁谱仪

根据神光-Ⅲ原型内爆实验条件下初级中子能谱诊断的要求，提出了反冲质子磁谱仪原型的设计方案，并通过蒙特卡罗程序Geant4对设计方案进行了仿真模拟。该质谱仪的测量能区在6~30 MeV，测量产额范围大于1012，能够测量内爆实验的全中子能谱。模拟结果表明：设计的谱仪对于14 MeV的中子探测效率大于10-11，能量分辨达到1%，信噪比大于10，满足神光-Ⅲ原型装置内爆实验离子温度诊断的要求。

Magnetic proton recoil spectrometer for neutron spectrum measurements

According to the requirement of implosions at the Shengguang-Ⅲ facility and its prototype, the design of a magnetic proton recoil spectrometer was illuminated, and it was simulated by the Monte-Carlo code Geant4. Neutron spectra in the range of 6~30 MeV can be measured by the spectrometer, and it is sensitive when neutron yield is larger than 1012. The whole neutron spectrum produced in implosions can be measured with the spectrometer. Simulation results show that the detection efficiency of the spectrometer is bigger than 10-11 in measuring 14 MeV neutrons with an energy resolution of about 1%, and the signal-to-background ratio of the spectrometer is larger than 10. The spectrometer can be used to diagnose ion temperature of DT fuel at the Shengguang-Ⅲ facility prototype.