斩盘产生的中子脉冲特性  

Neutron pulse speciality produced by chop disk

作　　者：李新喜[1] 王燕[1] 黄朝强[1] 陈波[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《光学精密工程》2009年第9期2112-2119,共8页Optics and Precision Engineering

基　　金：中国工程物理研究院科学技术发展基金资助项目(No.2007B02002)

摘　　要：为更好地设计转盘式中子斩波器,建立了单斩盘和异向旋转双斩盘的结构模型。采用国际上常用的Mcstas模拟计算软件,分别对单斩盘和异向双斩盘产生的中子束流脉冲的形成特性进行了模拟计算,获得了相关物理参数对斩盘产生中子束流脉冲的影响曲线,讨论了单斩盘与双斩盘脉冲形成的束流特性的差别与优缺点。分别对单斩盘和异向旋转双斩盘模型产生的中子束流脉冲可能产生的误差进行了理论分析,讨论了各客观物理因素对误差的影响。结果表明,考虑实际应用条件,在特定物理参数下,异向旋转双斩盘的第二斩盘窗口宽度应在不超过34 mm的范围内综合选择。计算结果可用于中子斩波器的理论设计及其相关物理参数的选择。In order to improve the neutron chopper design,the structural models of a single-chop-disk and an opposite rotate double-chop-disk were established. According to corresponding physical parameters, the neutron pulses formed by the single-chop-disk and the double-chop-disk were simulated by internationally popular Mcstas software respectively, and the influence curves of physical parameters on the pulses from the chop-chopdisks were obtained. Then, advantages and disadvantages of the neutron pulses generated by the single-chop-disk and the double disk were discussed. The discussion also refered to the influence of objective physical factors on the errors of neutron pulses generated by the single-chop-disk and the double-chop-disk. Considering the practical application, it suggests that the second cut width of the window in the double-chop-disk should be less than 34 mm in specific physical parameters. The results can provide the reference and theoretical support for optimizing design and manufacturing of choppers.

关 键 词：中子斩盘 物理参数 Mcstas软件 束流脉冲 

分 类 号：TL817.9[核科学技术—核技术及应用]