计算物理 ›› 2011, Vol. 28 ›› Issue (3): 323-328.

• 研究论文 • 上一篇    下一篇

提高超高能中子计算效率的蒙特卡罗抽样技巧

李树1, 田东风2, 邓力1   

  1. 1. 北京应用物理与计算数学研究所, 北京 100088;
    2. 中国工程物理研究院, 四川 绵阳 621900
  • 收稿日期:2010-04-08 修回日期:2010-08-10 出版日期:2011-05-25 发布日期:2011-05-25
  • 作者简介:李树(1974-),男,重庆,副研究员,博士,从事粒子输运研究工作,北京8009信箱16分箱100088
  • 基金资助:
    中国工程物理研究院科学技术发展基金(2008B0103005,2008B0202018)资助项目

High Efficiency Monte Carlo Sample Method for Super-high Energy Neutrons

LI Shu1, TIAN Dongfeng2, DENG Li1   

  1. 1. Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
    2. China Academy of Engineering Physics, Mianyang 621900, China
  • Received:2010-04-08 Revised:2010-08-10 Online:2011-05-25 Published:2011-05-25

摘要: 利用蒙特卡罗方法模拟中子与中子碰撞及超高能中子的产生与输运,原有抽样方法需要模拟大量样本方能使与超高能中子有关统计量的计算误差达到要求.针对ICF聚变靶中子输运问题的特点,发展一种"加权赌分裂抽样方法",以增加重要区域的抽样数、减少非重要区域的抽样数,同时通过权修正保证计算结果无偏.典型模型数值模拟计算结果显示,该方法能够有效增加聚变区的中子抽样数、增加中子相互碰撞数,使超高能中子通量计算误差显著降低,达到提高超高能中子计算效率的目的.

关键词: 蒙特卡罗方法, 超高能中子, 抽样方法, ICF聚变, 中子输运

Abstract: An adding weight sample method is developed for neutron transportation in inertial confinement fusion.It aims to increase samples in important zone and decrease samples in non-important zone.Weight of each sample is corrected for keeping calculated results non-bias.Typical model is simulated.It indicates that the method improves effectively neutron samples in fusion zone,while collisions between neutrons increase obviously.Calculation error of super-high energy neutron flux is decreased remarkably.Calculation efficiency of super-high energy neutrons is improved.

Key words: Monte Carlo method, super-high energy neutron, sample method, neutron transportation

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