计算物理 ›› 2006, Vol. 23 ›› Issue (1): 1-9.

• 论文 •    下一篇

计算中子增殖率的时间强迫碰撞方法

王瑞宏1, 邓力1, 许海燕1, 裴鹿成2   

  1. 1. 北京应用物理与计算数学研究所, 北京 100088;
    2. 中国原子能科学研究院, 北京 102413
  • 收稿日期:2005-05-23 修回日期:2005-10-17 出版日期:2006-01-25 发布日期:2006-01-25
  • 作者简介:王瑞宏(1967-),男,江苏,副研,博士生,从事蒙特卡罗方法及其应用研究,北京8009信箱16分箱,北京100088.
  • 基金资助:
    中国工程物理研究院基金(20040655)资助项目

Time Forced Collision Methods for Multiplication Rate Calculation

WANG Rui-hong1, DENG Li1, XU Hai-yan1, PEI Lu-cheng2   

  1. 1. Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
    2. China Institute of Atomic Energy, Beijing 102413, China
  • Received:2005-05-23 Revised:2005-10-17 Online:2006-01-25 Published:2006-01-25

摘要: 为获得更多粒子在特定时间步内的碰撞信息,给出3种解决介质非均匀的时间强迫碰撞抽样目的:离散化抽样目的,强截面抽样目的和均匀时间抽样目的.将强迫碰撞目的由只适合在各自均匀的几何区域内分别强迫碰撞,扩展为也适合在特定时间步内中子可能经过任意非均匀介质的强迫碰撞.通过一个简单的增殖系统的中子增殖率计算问题,对时间强迫碰撞的3种目的和直接模拟目的进行了计算比较.结果表明,3种时间强迫碰撞目的的效率相差不大,但明显优于直接模拟目的,当步长从2×10-5缩至10-6μs,FOM(计算效率或称优度)约高出2至4个量级.

关键词: 中子增殖率, MonteCarlo方法, 时间强迫碰撞方法, 离散化抽样方法, 强截面抽样方法, 均匀时间抽样方法

Abstract: In order to obtain more reaction information of neutron or the other secondary particles by forcing the collision to occur within a small time step, three Monte Carlo Time Forced Collision (TFC) sampling methods called discrete, large cross section and uniform time sampling method are presented, derived and tested. TFC method can be used in more complicated eases. For example, particle transporte through continuously changing materials within a cut time. Numerical results of simple multiplication system show that the calculation efficiency of TFC method is higher than that of the analog method by 2~4 magnitudes.

Key words: multiplication rate, Monte Carlo method, time forced collision, discrete sampling, large cross sections sampling, uniform time sampling

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