Laser-induced Arc Discharge Experiment and Analysis of LEO Spacecraft Solar Array
Based on the space arc discharge theory of solar array,the mechanism of nanosecond pulse laser-induced arc discharge of solar array is analyzed.The power density threshold and dis-charge characteristics of nanosecond pulse laser-induced arc discharge of solar array in LEO(low earth orbit)plasma environment are experimentally studied by using space discharge simulation experiment system.The results indicate that the power density threshold of laser-induced solar array arc discharge in the LEO plasma environment is about 1.08×108 W/cm2.Compard with no laser-induced discharge,the discharge duration has increased by 20%,and the probability of dis-charge induced by each nanosecond pulse laser application is about 60%.By comparing and analy-zing the damage effects of solar array under different working conditions,it can be concluded that nanosecond pulse laser-induced arc discharge destroys the insulation layer most seriously,which is easy to cause partial PN junction short circuit failure in solar cells.The damage degree is far greater than that of discharge ablation damage effect between strings in the space environment and the PN junction open circuit failure caused by thermal stress damage on cover glass surface.This conclusion can provide a reference for measures and parameters for discharging tests of spacecraft solar array.
LEO spacecraftsolar arraynanosecond pulsed laserarc discharge characteristics
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