| 引用本文: | 王同权,张树发,王尚武,等.电子在材料中输运的蒙特卡罗模拟.[J].国防科技大学学报,2000,22(1):81-84 ,110.[点击复制] |
| WANG Tongquan,ZHANG Shufa,WANG Shangwu,et al.Monte Carlo Transport of Electrons in Matter[J].Journal of National University of Defense Technology,2000,22(1):81-84 ,110[点击复制] |
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| 电子在材料中输运的蒙特卡罗模拟 |
| 王同权, 张树发, 王尚武, 沈永平 |
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(国防科技大学 理学院, 湖南 长沙 410073)
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| 摘要: |
| 介绍了电子输运问题的蒙特卡罗方法的基本原理和步骤。电子输运过程的模拟采用了“浓缩历史” 蒙特卡罗方法,电子随机游动步长根据能量步划分,在每个电子游动步内,电子的能量损失为非辐射( 碰撞)能量损失和辐射(韧致辐射)能量损失之和,其中非辐射能量损失通过对 Landau 公式的随机抽样得到,辐射能量损失以及韧致辐射光子的产生通过利用Bethe-Heitler的随机抽样处理,在每个电子游动步结束时电子的出射角的抽样利用 Gouddsmit-Saunderson多重散射公式,电子-电子的散射利用 Moller 截面公式进 行抽样。最后对电子在航天用合金铝平板材料中的输运进行了模拟计算并给出了计算结果。 |
| 关键词: 电子输运 蒙特卡罗方法 合金铝 能量损失 韧致辐射 多重散射 |
| DOI： |
| 投稿日期：1999-06-28 |
| 基金项目:国家部委基金项目资助 (97J11.6.2.KG0140) |
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| Monte Carlo Transport of Electrons in Matter |
| WANG Tongquan, ZHANG Shufa, WANG Shangwu, SHEN Yongping |
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(College of Science, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| This paper introduces the basic principles and steps of the Monte Carlo Methods used in the electron transport calculation. The electron transport process is simulated by “condensed history” Monte Carlo method. The electron random walk path length is determined by the energy steps. For a single step, the electron energy loss is the total amount of the nonradiative (collisional) energy loss and radiative (bremsstrahlung) energy loss, the nonradiative energy loss in each step is sampled from Landau formulation, and the radiative energy loss and the production of bremsstrahlung photon is sampled from Bethe-Heitler formulation. The direction of electron at the end of each step is sampled from the Gouddsmit-Saunderson multiple scattering formulation. The Moller cross section is used for the sampling of the electron-electron scattering. Finally the electron transport in the space used aluminum alloy, and plane materials is calculated and the results are presented. |
| Keywords: electron transport Monte Carlo Methods aluminum alloy energy loss bremsstrahlung multiple scattering |
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