| 用于迷宫屏蔽计算的蒙特卡罗减方差方法研究 |
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| 引用本文： | 陈宜正,王鑫,武祯,刘福东,赵传奇,邱睿,李春艳,李君利.用于迷宫屏蔽计算的蒙特卡罗减方差方法研究[J].原子能科学技术,2018,52(3):562-569. |
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| 作者姓名： | 陈宜正 王鑫 武祯 刘福东 赵传奇 邱睿 李春艳 李君利 |
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| 作者单位： | 1.清华大学 工程物理系，北京100084；2.清华大学 粒子技术与辐射成像教育部重点实验室，北京100084；3.中国工程物理研究院 高性能数值模拟软件中心，北京100088；4.同方威视技术股份有限公司，北京100084；5.环境保护部 核与辐射安全中心，北京100082 |
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| 摘 要： | 本文应用多种减方差技巧提出了强迫指向自动重要抽样（FPAIS）方法，并在MCNP5程序平台实现了该方法。采用该方法对1个多折迷宫算例进行了模拟计算，计算结果与MCNP5程序的直接模拟、DXTRAN球、点通量3种方法的结果进行了比对。基于此算例对FPAIS方法进行了引导面设置和粒子数敏感性分析。结果表明，FPAIS方法在保证一定计算精度的前提下，比其他3种方法的FOM提高2~3个量级，且该方法对引导面设置不敏感、可用性强，对于迷宫屏蔽计算是一种准确、高效的解决方案。
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| 关 键 词： | 迷宫屏蔽 蒙特卡罗 强迫指向自动重要抽样 引导面 |
Study on Monte Carlo Variance-reduction Method Used for Maze Shielding Calculation |
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| CHEN Yizheng,WANG Xin,WU Zhen,LIU Fudong,ZHAO Chuanqi,QIU Rui,LI Chunyan,LI Junli.Study on Monte Carlo Variance-reduction Method Used for Maze Shielding Calculation[J].Atomic Energy Science and Technology,2018,52(3):562-569. |
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| Authors: | CHEN Yizheng WANG Xin WU Zhen LIU Fudong ZHAO Chuanqi QIU Rui LI Chunyan LI Junli |
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| Affiliation: | 1.Department of Engineering Physics, Tsinghua University, Beijing 100084, China; 2.Key Laboratory of Particle & Radiation Imaging of Ministry of Education, Tsinghua University, Beijing 100084, China; 3.Software Center for High Performance Numerical Simulation, China Academy of Engineering Physics, Beijing 100088, China; 4.Nuctech Company Limited, Beijing 100084, China; 5.Nuclear and Radiation Safety Center, Ministry of Environmental Protection, Beijing 100082, China |
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| Abstract: | The forced pointing auto-importance sampling (FPAIS) method was presented using multiple variance-reduction methods in this paper, and was realized in MCNP5 code. This method was applied to the calculation of a multiple-bend maze example, and the calculation result was compared with natural Monte Carlo calculation, DXTRAN sphere and point flux methods using MCNP5 code. Besides, the sensitivity for setting the guiding surface and particle number of FPAIS method was analyzed with this example. The results show that the FOM of FPAIS significantly increases with 2.3 orders of magnitude compared with the other three methods in the premise of ensuring high calculation accuracy. FPAIS method is insensitive to the setting of the guiding surface and easy to use, and it is an accurate and efficient solution for the calculation of maze shielding. |
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| Keywords: | maze shielding Monte Carlo forced pointing auto-importance sampling guiding surface |
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