摘要
针对国际热核聚变实验堆(ITER)对中子通量密度测量宽量程、高集成度、实时性的要求,设计了一套基于PXI架构的多通道中子通量密度测量系统。该系统包括新研制的电流灵敏前置放大器及基于高速模数转换器(ADC)和可编程逻辑器件(FPGA)的主电子学插件。通过全数字化信号处理技术衔接脉冲计数和坎贝尔两种测量模式,大幅拓展了测量量程和提高了系统集成度。该系统通过使用脉冲堆积率估算算法,实现了测量模式的精确自动切换。实验结果表明,该系统具备单一裂变室大于1.7×10^(10)cm^(-2)·s^(-1)中子通量密度实时测量能力,全量程相对误差低于7.1%。
Aiming at the wide range, high integration and real-time performance on the neutron flux density measurement by International Thermonuclear Experimental Reac- tor （ITER） requirements, a set of multi-channel neutron flux density measurement system based on PCI extension for instrumentation （PXI） bus was designed. This system comprised a specially designed current-sensitive preamplifier and main electronics plug-in mainly including high speed analog-to-digital converter （ADC） and field programmable gate array （FPGA）. The fully digital signal processing technique was utilized to join pulse counting mode and Campbelling mode, significantly increasing the neutron flux density measuring range and system integration. The neutron flux density estimation algorithm based on pulse piling-up proportion was able to choose and switchmeasuring modes accurately and automatically. The experiment result shows that this system achieves real-time neutron flux density measurement on a single fission chamber, and enhances upper limit of neutron radiation dose larger than 1.7 ×10^10cm^-2·s^-1. The entire scale relative error is below 7.1%.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2017年第6期1071-1076,共6页
Atomic Energy Science and Technology
基金
国家磁约束核聚变发展研究专项资助项目(2013GB104003)
关键词
ITER
反应堆监测
中子通量密度测量
信号采集与处理
ITER
reactor monitoring
neutron flux density measurement
signal acqui- sition and processing
