超短超强激光产生正电子的蒙特卡罗模拟

Yan Yonghong; Zhao Zongqing; Wu Yuchi; Gu Yuqiu; Cao Leifeng; Yao Ze’en; Teng Jian; Dong Kegong; Liu Dongxiao; Fan Wei; Wei Lai; Yu Jinqing

doi:10.3788/HPLPB20122406.1396

Volume 24 Issue 06

May 2012

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Article Navigation > High Power Laser and Particle Beams > 2012 > 24(06): 1396-1400

Chen Guangyu, Zhang Xiaomin, Zheng Wanguo, et al. Evaluation methods and models of mission availability for ICF laser facilities[J]. High Power Laser and Particle Beams, 2012, 24: 2103-2108. doi: 10.3788/HPLPB20122409.2103

Citation:

Yan Yonghong, Zhao Zongqing, Wu Yuchi, et al. 超短超强激光产生正电子的蒙特卡罗模拟[J]. High Power Laser and Particle Beams, 2012, 24: 1396-1400. doi: 10.3788/HPLPB20122406.1396

Citation:

Yan Yonghong, Zhao Zongqing, Wu Yuchi, et al. 超短超强激光产生正电子的蒙特卡罗模拟[J]. High Power Laser and Particle Beams, 2012, 24: 1396-1400. doi: 10.3788/HPLPB20122406.1396

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超短超强激光产生正电子的蒙特卡罗模拟

doi: 10.3788/HPLPB20122406.1396

1.
School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China;
2.
Research Center of Laser Fusion,CAEP,P.O.Box 919-986-6,Mianyang 621900,China

Received Date: 2011-08-22
Rev Recd Date: 2012-01-05
Publish Date: 2012-06-15

Abstract

Abstract

通过理论分析，建立了超短超强激光与固体靶作用产生正电子的蒙特卡罗模拟模型及Geant4模拟程序。模拟研究了靶材料、靶厚度及超热电子温度等对正电子产额的影响，结果表明：对铝、铜、锡、钽、金、铅6种靶材料，金靶的正电子产额最高，是优秀的正电子产生靶；不同超热电子温度下存在不同的最佳靶厚度，在最佳靶厚度以下，正电子产额随靶厚度增长而增大，靶厚度取3 mm较为合适；超热电子温度越高，正电子产额也越高，提高激光强度是增加正电子产额的有效途径。模拟研究给出了正电子角分布及其能谱，结果显示，正电子发射明显前倾，从大于90方向范围发射的正电子数量极少，且超热电子温度越高前倾特点越明显，能量呈类麦克斯韦分布，靶背法线方向出射的正电子的温度随超热电子温度升高而升高。
- ultrashort ultraintense laser,
- hot electron,
- positron,
- geant4 code

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