Monte Carlo simulations of photon-electron transports of cylinder cavity
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摘要: 应用三维并行蒙特卡罗程序JMCT, 计算了特征温度分别为1, 3, 5, 8keV的黑体谱X射线入射到铝、二氧化硅、金的表面的背散射光电产额和电子能谱, 并与文献结果进行对比, 验证了程序的正确性, 进而针对系统电磁脉冲(SGEMP)研究中的典型几何结构——金属圆柱腔体, 模拟计算了其在黑体谱X射线照射下的光电输运过程, 用温度为1keV、注量为1J/m2的黑体谱X射线平行照射圆柱腔侧面, 半个侧面发射光电子, 计算得出了和方位角相关的不同面上发射光电子的光电产额、能谱分布和角分布, 结果表明掠入射的X射线会产生更高的光电产额; 光电子的发射角分布都基本符合余弦角分布的规律。Abstract: Using the three dimensional and paralleled JMCT Monte Carlo code, the backscattered photoelectric yields and electron energy spectra are calculated for the cases that black body X-ray sources of temperatures of 1, 3, 5, 8 keV impact on the material surfaces of Al, SiO2 and Au respectively. The simulation results are consistent with the results in references, which verify the validity of the code. Then the typical photon-electron transport example in SGEMP for black body X-rays impacting on a cylinder cavity is calculated. Half of the side-face of the cylinder emits photoelectrons in the case that the black body X-rays of temperature 1 keV and fluence 1 J/m2 impact on the side-face of the cylinder. The photoelectron parameters of photoelectric yield, energy distribution and angular distribution related with azimuth are calculated. The results show that obliquely incident X-ray could induce higher photoelectric yields than normally incident X-ray and the distributions of photoelectrons are all very close to cosine distribution.
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Key words:
- Mont Carlo /
- JMCT /
- X-ray /
- system generated electromagnetic pulse /
- photoelectron
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图 3 不同温度黑体谱X射线照射下三种材料光电子能谱
Figure 3. Photoelectron energy spectra of three materials under incidence of different temperature blackbody X-ray from calculation
图 5 入射X射线能谱及各个面背向散射光电子的能谱和角分布
Figure 5. Incident X-ray energy spectra and backscattered photoelectron energy spectra and angular distribution of three surfaces
表 1 三种材料背散射光电产额
Table 1. Backscattered photoelectric yields of three materials
temperature/keV photoelectric yields/(electrons·photon-1) photoelectric yields/(electrons·cal-1) Al Au SiO2 Al Au SiO2 1 4.70×10-3 2.13×10-2 3.02×10-3 4.02×1013 1.82×1014 2.58×1013 3 3.10×10-3 1.99×10-2 2.21×10-3 9.77×1012 6.27×1013 6.99×1012 5 2.05×10-3 1.76×10-2 1.55×10-3 3.93×1012 3.38×1013 2.97×1012 8 1.33×10-3 1.48×10-2 1.03×10-3 1.60×1012 1.77×1013 1.24×1012 Note: 1 cal=4.184 J. 
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