摘要
航天器表面介质材料在空间等离子体环境下会产生放电现象,放电诱发的瞬态脉冲会对航天器在轨安全运行产生较大的影响。通过对不同厚度的聚酰亚胺和聚四氟乙烯材料进行电子辐照,对放电诱发的瞬态脉冲进行测量,结果表明:随着电子能量增加,材料的电荷累积速率加快,放电电流的峰值并不随着电子能量的增加而增大,而是一个近似不变的值;放电频率随着电子能量的增加而增大且呈现出正相关的特性;随着介质材料厚度略微增大,表面充电电位增大,累积的电荷量增多,放电峰值增大,放电频率变小。
Spacecraft surface dielectric materials lead to discharge phenomena in space plasma environment,and the transient pulse induced by discharge has a great impact on the safe operation of spacecraft in orbit.Through tests on measuring the transient pulse induced by electron radiation of Kapton and Teflon materials with different thickness,and tests on increasing of electron energy,we concluded that the discharge peak current remains unchanged with increasing energy of electron.Meanwhile the discharge frequency shows a positive correlation with the increase of the electron energy because of the charge accumulation rate increasing.As the thickness of dielectric material increases,the surface potential and the discharge peak current increase,and the discharge frequency diminishes.
作者
李伟康
秦晓刚
柳青
LI Weikang;QIN Xiaogang;LIU Qing(Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Lanzhou 730000,China;Science and Technology on Material Performance Evaluating in Space Environment Laboratory,Lanzhou Institute of Physics,Lanzhou 730000,China)
出处
《真空与低温》
2019年第1期14-18,共5页
Vacuum and Cryogenics
关键词
介质材料
空间电子辐照
放电波形
放电频率
dielectric material
discharge waveform
discharge peak current
discharge frequency
