强激光与粒子束2013，Vol.25Issue(8)：2117-2120,4.DOI:10.3788/HPLPB20132508.2117
临界堆中子增殖系数测量统计涨落数值模拟
Numerical simulation of statistical fluctuations in measurements of neutron multiplication coefficients on a critical power assembly
付澜 1张建华 1杨高照 1郭洪生1
作者信息
- 1. 中国工程物理研究院核物理与化学研究所,四川绵阳621900
- 折叠
摘要
Abstract
A computational model for the neutron multiplication coefficient ("α value") of a critical power assembly is built,which is measured by current-mode detectors formed by scintillators and photomultiplier tubes (PMTs).Through producing ideal functions and setting up various kinds of fluctuation errors,we numerally simulate the effects of statistical fluctuations in measurements of the α values.The results indicate that precision of measuring the α values will be influenced by statistical fluctuations of the measured signals.Considering the influence of statistical fluctuations,the number of the incident particles to the detector's surface must reach a certain value in order to make the α value satisfy the measurement requirements.Thus the initial intensity of the incident particles must meet different requirements for different measuring time intervals,which can be increased while the initial intensity cannot meet the requirement.When the exponential signal carries random fluctuations with it,a larger time interval for maintaining the α values will effectively attenuate the influence of statistical fluctuations.关键词
临界堆/中子增殖系数/统计涨落/数值模拟Key words
critical power assembly/neutron multiplication coefficient/statistical fluctuation/numerical simulation分类
能源科技引用本文复制引用
付澜,张建华,杨高照,郭洪生..临界堆中子增殖系数测量统计涨落数值模拟[J].强激光与粒子束,2013,25(8):2117-2120,4.
