A solution to "long history" in the method of GVR based on weight window

Hengquan ZHANG; Jia LI; Qingjun ZHU; Yuxiao WU; Xingchen NIE

doi:10.11889/j.0253-3219.2017.hjs.40.120602

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A solution to "long history" in the method of GVR based on weight window

NUCLEAR ENERGY SCIENCE AND ENGINEERING | 更新时间：2021-05-19

- A solution to "long history" in the method of GVR based on weight window
- NUCLEAR TECHNIQUES Vol. 40, Issue 12, Article number: 120602(2017)
- 作者机构：
  
  1.中国科学技术大学核科学技术学院合肥 230027
  2.中国科学院等离子体物理研究所合肥 230031
  3.广西防城港核电有限公司防城港 538000
- 作者简介：
- 基金信息：
  
  the Fundamental Research Funds for the Central Universities
- DOI：10.11889/j.0253-3219.2017.hjs.40.120602
  CLC： TL62
- Received：05 May 2017，
  
  Revised：30 June 2017，
  
  Published：10 December 2017
- 稿件说明：
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Hengquan ZHANG, Jia LI, Qingjun ZHU, et al. A solution to "long history" in the method of GVR based on weight window[J]. Nuclear techniques, 2017, 40(12): 120602
DOI：

Hengquan ZHANG, Jia LI, Qingjun ZHU, et al. A solution to "long history" in the method of GVR based on weight window[J]. Nuclear techniques, 2017, 40(12): 120602 DOI： 10.11889/j.0253-3219.2017.hjs.40.120602.

摘要

在具有全局特性的蒙特卡罗粒子输运计算中，常采用基于权窗的全局减方差方法，由此引起的"长历史"问题使计算效率大大降低。为了提高蒙特卡罗计算效率，减小计算资源的浪费，本文对"长历史"的成因及解决方案进行了研究。通过研究中国聚变工程试验反应堆（Chinese Fusion Engineering Testing Reactor，CFETR）中子输运计算中"长历史"的事件记录文件，提出了"长历史"的成因与粒子连续在轮盘赌中存活有关，针对此成因提出了通过粒子在轮盘赌中存活的次数来限制粒子分裂的解决方法，并通过CFETR模型对这个方法进行了测试。结果显示，次数限取1-4时，并行效率达到80%，无"长历史"出现，品质因子（pFoM

）达到不采用次数限时的约3倍。综上，采用这种方法可以有效克服"长历史"问题，使全局减方差方法的计算效率明显提升。

Abstract

Background

The "long history" induced by the method of global variance reduction (GVR) based on weight window would reduce the efficiency of the Monte Carlo particle transport calculation with global characteristic.

Purpose

To enhance the efficiency and minimize the waste of computing resource

this article proposes a solution to "long history" based on the study of its causes.

Methods

According to the event log of "long history" in Chinese fusion engineering testing reactor (CFETR) neutron transport calculation

the cause of the "long history" is brought up

which is in relation to particle's successively surviving in the Russian roulette games. A solution to the "long history" by limiting particle's splitting according to the number of surviving games (weight roulette number

WRN)

is came up with

which is tested in CFETR model.

Results

The result shows that when the limited number is between 1 and 4

the parallel efficiency reaches 80%

with no "long history" present and global figure of merit (pFoM

) being around 3 times of that in calculation without the limited number.

Conclusion

The solution proposed prevented the "long history" and thus greatly enhanced the efficiency of GVR.

关键词

Keywords

references

X-5 Monte Carlo Team. A general Monte Carlo N-particle transport code:user's guide[R]. Version 5. Vol.Ⅱ. USA:Los Alamos National Laboratory, 2003.

聂星辰 , 李佳 , 赵平辉 , . 蒙特卡罗模拟CFETR中子输运计算中的全局减方差方法应用及对比 . 核技术 , 2016 . 39 ( 3 ): 030501 DOI: 10.11889/j.0253-3219.2016.hjs.39.030501 http://doi.org/10.11889/j.0253-3219.2016.hjs.39.030501 http://www.j.sinap.ac.cn/hejishu/CN/abstract/abstract557.shtml .

Xingchen NIE , Jia LI , Pinghui ZHAO , . Application and comparison of global variance reduction methods employed in Monte Carlo neutron transport for CFETR . Nuclear Techniques , 2016 . 39 ( 3 ): 030501 DOI: 10.11889/j.0253-3219.2016.hjs.39.030501 http://doi.org/10.11889/j.0253-3219.2016.hjs.39.030501 http://www.j.sinap.ac.cn/hejishu/CN/abstract/abstract557.shtml .

A J Van Wijk , G van den Eynde , J E Hoogenboom . An easy to implement global variance reduction procedure for MCNP . Annals of Nuclear Energy , 2011 . 38 2496 - 2503 . DOI: 10.1016/j.anucene.2011.07.037 http://doi.org/10.1016/j.anucene.2011.07.037 .

A Davis , A Turner . Comparison of global variance reduction techniques for Monte Carlo radiation transport simulations of ITER . Fusion Engineering and Design , 2011 . 86 2698 - 2700 . DOI: 10.1016/j.fusengdes.2011.01.059 http://doi.org/10.1016/j.fusengdes.2011.01.059 .

J Naish , F Fox , Z Ghani , . Radiation mapping at JET and ITER using advanced computational acceleration techniques and tools . Nuclear Technology , 2015 . 192 299 - 307 . DOI: 10.13182/nt14-132 http://doi.org/10.13182/nt14-132 .

聂星辰 , 李佳 , 赵平辉 , . 深穿透屏蔽计算中MCNP减方差技巧应用及比较 . 核电子学与探测技术 , 2016 . 36 ( 7 ): 729 - 733, 741 . DOI: 10.3969/j.issn.0258-0934.2016.07.016 http://doi.org/10.3969/j.issn.0258-0934.2016.07.016 .

Xingchen NIE , Jia LI , Pinghui ZHAO , . Application and comparison of MCNP variance reduction techniques for deep penetration shielding calculation . Nuclear Electronics & Detection Technology , 2016 . 36 ( 7 ): 729 - 733, 741 . DOI: 10.3969/j.issn.0258-0934.2016.07.016 http://doi.org/10.3969/j.issn.0258-0934.2016.07.016 .

Turner A, Davis A. Improving computational efficiency of Monte-Carlo simulations with variance reduction[C]. International Conference on Mathematics and Computational Methods Applied to Nuclear Science & Engineering (M&C 2013), Sun Valley, Idaho, USA, 2013. http://arxiv.org/abs/1309.6166

Wasastjerna F. Using MCNP for fusion neutronics[D]. Finland:VTT Technical Research Centre of Finland, 2008.

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