摘要
中子飞行时间谱仪是用于中国先进研究堆上可直接测量冷、热中子能谱的实验装置。介绍了该谱仪的结构和谱仪关键部件的参数选择,分析了机械斩波器狭缝与限束狭缝对脉冲中子束中子数和宽度的影响,得出与中子波长相关联的脉冲中子束中子数和宽度的公式。根据高注量率中子束能谱测量的需求,通过选择低灵敏探测器、加载探测器狭缝、选择多道时间分析器获取数据,保证漏计数率小于0.5%。设计了探测系统电子学线路,给出系统总分辨时间为22.15～29.46μs。
The cold or thermal neutron energy spectra on China Advanced Research Reactor（CARR） could be directly measured by neutron time of flight spectrometer.Spectrometer structure and selected parameters of its key components were introduced.The impact of chopper slit and flux limit slit on neutron counts and pulse width was analyzed.The formulas of neutron counts and pulse width which were dependent on neutron wavelength were acquired.According to neutron energy spectrum measurement requirement for high fluence rate neutron beam,low-sensitivity detector,detector flux limit slit and multi-channel scaler for data acquisition were selected.These would ensure that the count loss rate was less than 0.5%.Electronics framework of detection system was designed and the total resolution time was 22.15-29.46 μs.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2013年第5期880-883,共4页
Atomic Energy Science and Technology
关键词
中子能谱
飞行时间
高注量率
低漏计数率
neutron energy spectrum
time of flight
high fluence rate
low count loss rate
