Electrostatic Discharge of Plasma Created by Hypervelocity Impact 2A12 Aluminum Targets With Gradient Potential
Electrostatic Discharge of Plasma Created by Hypervelocity Impact 2A12 Aluminum Targets With Gradient Potential
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超高速撞击具有梯度电势的 2A12 铝靶材产生的等离子体静电放电
DOI：
10.1109/tps.2017.2748953
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发表时间：
2017-09
影响因子：
1.5
通讯作者：
Tang EL
中科院分区：
文献类型：
--
作者：
Wang Ruizhi;Tang Enling;Han Yafei;He Liping;Liu Shuhua;Wang Meng;Xiang Shenghai;Xia Jin;Tang EL
基于空间等离子体环境或太阳风活动中带电粒子在航天器表面产生梯度电位的客观实际，碎片或流星体撞击会引起表面带电或深层介质带电航天器产生静电放电。为了在实验室中模拟航天器表面的梯度电位，将航天器表面分割成不同的部分，在相邻两个表面上预留不同的间距，通过增加阻力来产生不同的电位面，并将电位最高的表面作为分割表面中的目标。自行搭建了实现不同梯度电位的电路系统、放电测试系统以及超高速摄像采集系统，结合二级轻气炮加载系统，进行了4组梯度电位超高速撞击2A 12铝靶实验。在实验中，2A 12铝靶在不同电位区的间距相同，4组实验的间距分别为2、5、10和15 mm，靶为高电位2A 12铝。实验中，弹丸的撞击速度约为3 km/s，入射角为60°（弹丸飞行轨迹与靶面之间）。采用电压探头和电流探头分别测量了冲击过程中的放电电压和电流。实验结果表明，碰撞等离子体在高、低电位靶之间形成等离子体放电通道，在2-15 mm的间隙内可引起不同靶之间的放电，放电电流沿高、低电位靶沿着方向变化不明显。在近碰撞速度和相同入射角下，放电持续时间随高、低势靶间距离的增大而减小。梯度电位超高速撞击2A 12铝靶产生放电的整个物理过程大致经历了四个阶段。第一阶段为超高速碰撞产生的等离子体，第二阶段为超高速碰撞产生的等离子体和具有梯度电位的分裂靶诱导的放电等离子体的复杂混合等离子体，第三阶段为超高速碰撞诱导的放电等离子体，第四阶段为带电粒子在电磁场中往复运动引起的带电粒子间放电。
Based on the objective reality of gradient potential existence in spacecraft surface caused by charging particles in space-plasma environment or solar wind activities, electrostatic discharge of spacecraft with surface charging or deep dielectric charging would be induced by debris or meteoroids impact. To simulate the gradient potential on the spacecraft surface in the laboratory, spacecraft surface was segmented into different parts, which different spacing reserved in two adjacent surfaces was added resistance to create different potential surfaces, and the highest potential surface as a target in the segmented surface. Circuit system realizing different gradient potential, discharge test system, as well as ultrahigh-speed camera acquired system was built by ourselves; combining with two-stage light gas gun loading system, four set experiments have been performed about hypervelocity impact on 2A12 aluminum target with gradient potential. In the experiments, spacings of 2A12 aluminum target were the same among different potential parts in every experiment, and the spacings of four set experiments were 2, 5, 10, and 15 mm, and high-potential 2A12 aluminum as the target, respectively. The experiments were performed at the impact velocity of about 3 km/s and the incidence angles of 60° (between projectile flying trajectory and target plane). Voltage probes and current probes were used to acquire discharge voltages and currents during the process of the impact. The experimental results showed that the discharge induced by impact plasma was generated between high- and low-potential targets by forming a plasma discharge channel, the gaps with 2–15 mm can evoke discharge among different targets, and the variations of the discharge current along the high- and low-potential targets did not obviously. However, the discharge duration decreased with an increasing of distance between high- and low-potential targets at the near collision velocities and the same incidence angle of the projectile. The whole physical process of discharge had experienced four stages in general, which created by hypervelocity impact 2A12 aluminum targets with gradient potential. The first stage was plasma generated by hypervelocity impact, the second stage was complex mixed plasma including plasma generated by hypervelocity impact and discharge plasma induced by split targets with gradient potential, the third stage was discharge plasma induced by hypervelocity impact, and the fourth stage was the discharge between charging particles due to the reciprocating motion of charging particles in the electromagnetic field.
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等离子体物理学概论
DOI：
10.1088/0741-3335/38/1/004
发表时间：
1996
期刊：
影响因子：
--
作者：
J. A. Wesson
通讯作者：
J. A. Wesson
DOI：
--
发表时间：
1994-06
期刊：
--
影响因子：
--
作者：
B. J. Anderson;R. Smith
通讯作者：
B. J. Anderson;R. Smith
影响因子：
5.1
作者：
R. Caswell;N. Mcbride;andR . Taylor
通讯作者：
R. Caswell;N. Mcbride;andR . Taylor
影响因子：
1.5
作者：
K. Toyoda;S. Aso;T. Kyoku;T. Kitamura;M. Cho
通讯作者：
K. Toyoda;S. Aso;T. Kyoku;T. Kitamura;M. Cho
影响因子：
5.1
作者：
T. Harano;Yu Machida;S. Fukushige;T. Koura;S. Hosoda;M. Cho;Y. Akahoshi
通讯作者：
T. Harano;Yu Machida;S. Fukushige;T. Koura;S. Hosoda;M. Cho;Y. Akahoshi