Electrostatic Discharge of Plasma Created by Hypervelocity Impact 2A12 Aluminum Targets With Gradient Potential

摘要: Based on the objective reality of gradient potential existence in spacecraft surface caused by charging particles space-plasma environment or solar wind activities, electrostatic discharge with deep dielectric would be induced debris meteoroids impact. To simulate laboratory, was segmented into different parts, which spacing reserved two adjacent surfaces added resistance to create surfaces, and highest as a target surface. Circuit system realizing potential, test system, well ultrahigh-speed camera acquired built ourselves; combining two-stage light gas gun loading four set experiments have been performed about hypervelocity impact 2A12 aluminum potential. In experiments, spacings were same among parts every experiment, 2, 5, 10, 15 mm, high-potential target, respectively. The at velocity 3 km/s incidence angles 60° (between projectile flying trajectory plane). Voltage probes current used acquire voltages currents during process experimental results showed that plasma generated between high- low-potential targets forming channel, gaps 2–15 mm can evoke targets, variations along did not obviously. However, duration decreased an increasing distance near collision velocities angle projectile. whole physical had experienced stages general, created first stage impact, second complex mixed including split third fourth due reciprocating motion electromagnetic field.