Simulation study of internal system generated electromagnetic pulse of cylinder cavity
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摘要: 应用3维全电磁粒子模拟程序研究腔体的内SGEMP，作为校验，模拟计算了光电子由圆柱腔体端面向内发射的SGEMP模型，并与文献结果进行了对比；使用该程序对圆柱腔体的3维内SGEMP进行模拟研究，得出注量为100 J/m2，特征温度为2 keV的黑体谱X射线，垂直入射高为4.5 cm、半径为7.5 cm的圆柱腔体侧面时，发射电流为20 A，产生的电场最高可达150 kV/m，磁场高达3.0×10−5 T。并对不同X射线注量下的电荷和电场分布情况进行了初步研究。Abstract: The internal system generated electromagnetic pulse (SGEMP) effects induced by photoelectrons emitted from cylinder top surface is simulated by the 3D PIC code. First for validation, the results are compared to that from literature. Subsequently, the internal 3D SGEMP effects of the cylinder is studied by this code, the simulated results show the emitting current is 20 A, intense of electric field could get 150 kV/m and magnetic field is 3.0×10−5 T when the blackbody X-ray of temperature 2 keV and fluence 100 J/m2 perpendicularly irradiates the side of cylinder cavity with height of 4.5 cm and radius of 7.5 cm. The space distributions of electrons and electric field are studied elementarily for different X-ray fluences.
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Key words:
- PIC code /
- system generated electromagnetic pulse /
- angular distribution /
- photoelectron
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图 1 端面发射的圆柱腔模型
Figure 1. Cylinder cavity model of photoelectrons emitted from top surface
图 5 t=24 ns时z=22.5 cm的切面上和z=22.5 cm，y=0直线上的电场分布
Figure 5. Distribution of electric field in plane of z=22.5 cm and on line of z=22.5 cm，y=0 (t=24 ns)
图 6 坐标点x=7.4 cm, y=0, z=2.3 cm处的电场波形
Figure 6. Waveform of electric field at point of x=7.4 cm, y=0, z=2.3 cm
图 7 t=24 ns，z=0.1 cm切面上和z=0.1 cm，y=0直线上的磁场分布
Figure 7. Distribution of magnetic field in plane of z=0.1 cm and on line of z =0.1 cm，y=0，t=24 ns
图 8 t=24 ns，y=0的切面上和y=0，x=7.4 cm 直线上的磁场分布
Figure 8. Distribution of magnetic field in plane of y=0 and on line of y=0，x=7.4 cm，t=24 ns
图 9 坐标点x=7.4 cm, y=0, z=0.1 cm处的磁场波形
Figure 9. Waveform of magnetic field at point of x=7.4 cm, y=0, z=0.1 cm
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