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MONTE CARLO VARIANCE REDUCTION USING NESTED DXTRAN SPHERES

机译:使用嵌套DXTRAN球减少MONTE CARLO方差

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摘要

Dxtran is a deterministic transport method typically used for increasing the sampling in a spherical region that would otherwise not be adequately sampled because the probability of scattering toward the region is often very small. Essentially, the dxtran method splits the particle into two pieces at each source or collision point: a piece that arrives (without further collisions) at the dxtran sphere and a piece that does not. One difficulty with the dxtran method is that it can introduce a large weight fluctuation between particles colliding just before the sphere and particles colliding after crossing the sphere. New work shows that it is possible to mitigate this difficulty by extending the dxtran sphere concept to a set of nested dxtran spheres. Each dxtran sphere then shields its interior from particles whose weights are too large so that weights are more commensurate with their locations. Shielding against the large weights not only increases the efficiency of the calculation but the reliability as well. The effectiveness of the technique in MCNP was demonstrated on a 1-km air transport problem and on a concrete duct problem.
机译:Dxtran是一种确定性的传输方法,通常用于增加球形区域中的采样,否则该采样将无法充分采样,因为朝该区域散射的可能性通常很小。本质上,dxtran方法在每个源或碰撞点将粒子分为两部分:一块到达(没有进一步的碰撞)到达dxtran球体,另一部分没有。 dxtran方法的一个难题是,它会在刚好在球体之前碰撞的粒子和在球体穿过球体之后碰撞的粒子之间引入较大的重量波动。新工作表明,可以通过将dxtran球体概念扩展到一组嵌套的dxtran球体来减轻这一困难。然后,每个dxtran球体都会屏蔽其内部,使其免受重量过大的粒子的影响,从而使重量与其位置更加相称。屏蔽大重量不仅提高了计算效率,而且还提高了可靠性。在1公里的航空运输问题和混凝土管道问题上证明了该技术在MCNP中的有效性。

著录项

  • 来源
    《Nuclear Technology》 |2009年第3期|765-767|共3页
  • 作者单位

    Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545;

    Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545;

    Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Monte Carlo; variance reduction; angle biasing;

    机译:蒙特卡洛;方差减少;角度偏向;

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