中子噪声间隔分布实验及计算方法研究  

Experimental Measurement of Neutron Noise Time Interval Distribution and Theoretical Research on Calculation Method

作　　者：陈利高[1] 余纲林[1] 王侃[1] 李成龙[1] 杨鑫[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《核动力工程》2010年第S2期136-140,158,共6页Nuclear Power Engineering

摘　　要：利用微观噪声分析方法中的时间间隔分布方法进行反应堆动态参数的实验研究。阐述了利用MSP430单片机采集中子脉冲时间间隔分布,以及将数据传入PC机实时处理的方法;对清华大学工程物理系次临界装置的中子信号的间隔分布进行测量,并分析测量结果,以研究如何根据时间间隔分布的原理由测量数据得出α本征值的计算方法;论文通过实验给出了源中子和堆内中子计数分布的差别,利用同批次的测量数据,以罗西-α方法、方差平均值比方法以及理论计算值对实验结果进行了验证,确认了这种计算方法的正确性和精确性,以及时间间隔方法用于动态参数测量的优越性。Experimental research on the measurement of the reactor dynamic parameters is carried out by the time interval distribution method(Babala method).This paper describes how to acquire the distribution of the lengths of intervals between neutron pulse counts using MSP430 Single-Chip Computer and how to transfer the data to the PC.The interval distribution of neutron signals on the sub-critical facility at Depart-ment of Engineering Physics in Tsinghua University is measured,and the results are analyzed,to study the calculation method for the eigen value α based on the measured data.Further more,Feynman method and Rossi-α method are used to calculate the value of α,which are compared with the Babala method.The results indicate that Babala method for dynamic parameter measurement could reduce the measurement time and im-prove the accuracy of measurement results.This paper also gives out the statistical distribution difference be-tween the source neutrons and reactor neutrons.

关 键 词：数据采集 Babala 时间间隔分布方法 瞬发衰减常数α 

分 类 号：TL375[核科学技术—核技术及应用]