空间材料深层充放电效应试验研究
Experiment on deep dielectric charging and discharging of space materials
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摘要: 利用电子枪发射的单能电子束、以及放射源发射的能谱结构接近空间电子环境的β射线电子，模拟试验了几种常用空间介质材料和某卫星部件的深层充电过程；结合对放电电流脉冲和电场脉冲的测量，观测了深层放电脉冲信号及其对试验电路的影响。试验结果表明，在类似实际空间强度的pA量级电子束辐照下，介质材料可以累积大量电荷，其表面电位可以达到近万V；随后发生的介质材料放电可产生高强度的放电电流脉冲和电场脉冲，放电脉冲对试验电路造成较强的干扰。
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关键词:
- 空间材料；深层充放电；电子辐照；模拟试验
Abstract: This paper discusses the simulation experiment for deep charging and discharging process in dielectric materials for a satellite component used in space. Samples were irradiated with mono-energy electrons by using an electron gun and with β ray from a radioactive source. By measuring the current pulses and electric field pulses, the deep dielectric discharging and their effects on the experimental circuit can be studied. Results show that with irradiation of electron beam with a current density of pico-amperes, as is close to that in a real space environment, massive charge may be accumulated in dielectric materials to reach a surface potential of several kilo-volts. The subsequent discharge will generate high amplitude current and electric field pulses, which may heavily disturb the operation signals of the experimental circuit.-
Keywords:
- space materials
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