真空强电磁场环境下铝的二次电子倍增规律

Secondary electron multiplication of aluminum under strong vacuum electromagnetic field

针对卫星表面受强电磁环境的影响导致的充放电问题,采用1D3V的粒子网格(PIC)方法对卫星表面铝材料在空间强电磁环境作用下的二次电子倍增作用规律进行研究。结果表明:星表铝材料在不同微波幅值、不同频率下的二次电子倍增效应存在“最易”倍增区间;二次电子倍增规律表现为在特定频率下,铝的二次电子倍增随着微波电场幅值的增大先增强后降低,表现出最佳倍增区间的效应;在特定幅值下,铝的二次电子倍增效应也会先增强后降低,但是整体表现出低频时倍增强,高频时抑制倍增的效应。

This paper primarily employs the 1D3V particle-in-cell(PIC)method to investigate the rule of multifactor of aluminum material on satellite surface under the strong electromagnetic environment of space in order to study the charge and discharge effect brought on by the strong electromagnetic environment on the satellite surface.The result shows that there is an"easiest"multiplication range for the multifactor effect of aluminum materials under different microwave amplitudes and frequencies.The multifactor rules are:At a specific frequency,the multifactor of aluminum first increases and then decreases with the rising of microwave electric field amplitude,and there is an optimal secondary electron multiplication interval;At a certain amplitude,the multifactor effect of aluminum will first increase and then decrease,and it shows that the multifactor effect should be strong at low frequency and inhibited at high frequency.