Experimental Study on Surface Charge Discharge Effect of Common Spacecraft Materials in Jupiter Environment

The auroral zone of Jupiter is the plasma environment where auroral electrons are injected into.It is a typical harsh surface charging environment for Jupiter orbiter.Based on the Jupiter magnetospheric plasma model DG1/DG2,the plasma environment and its characteristics in the auroral zone of Jupiter are systematically discussed,and it is concluded that the double Maxwellian distribution model of background plasma plus auroral electrons can be used to approximate the plasma environment in the auroral zone of Jupiter when evaluating the surface charge level of Jupiter probe in simulation computation and ground simulation test.On the above basis,applying the“Space Plasma Charge-discharge Effect Simulation Equipment”and its test platform belonging to Lanzhou Institute of Physics and using the electron gun to generate and simulate the Maxwellian distribution incident auroral electron flow (characteristic energy is 25 keV) and its beam intensity (0.02~0.08 nA/cm²) in the auroral zone of Jupiter,the surface charge-discharge effects of ITO-OSR,CFRP and CERS used for Jupiter probe are ground simulated.The results show that the electrostatic discharge risk exists between CFRP and ITO-OSR,between CFRP and CERS,and between ITO-OSR and CERS in the Jupiter aurora environment.This study provides a design basis and experimental basis for the development of China’s future Jupiter probe and its chargedischarge effect protection.