通道等离子体环境对稳态等离子体推进器壁面腐蚀的影响

Abstract

稳态等离子体推进器工作过程中通道的等离子体环境参数会影响高能粒子束的分布，进而影响离子对壁面溅射的情况。本文就加入预电离腔及考虑电荷交换碰撞对壁面腐蚀的影响进行了研究。通过调整模型中预电离率参数，研究了预电离率大小对通道物理特性分布及对通道壁面常规腐蚀的影响。结果表明预电离不会影响通道内主要物理特性，但由预电离引入的额外等离子体会加剧壁面的常规腐蚀。通过加入蒙特卡洛碰撞模块得到了电荷交换碰撞对通道各项物理参数分布和壁面常规腐蚀的影响。结果表明当考虑电荷交换碰撞后，通道内高能离子密度减少，壁面常规腐蚀情况有所减缓。 The tunnel plasma environment can affect the distribution of high energy ion beam, and then the sputter-induced wall erosion. In this paper, the effects of preionization on the physical characteristic distributions and the wall erosion are investigated. The results indicate that the preionization do not affect the main physical characteristic in the discharge channel. While the wall erosion will be aggravated by the extra sputter plasma which is introduced by the preionization process. The effects of charge-exchange collision on the physical characteristic distributions and the wall erosion are also investigated. The results show that the ion density decreases and the wall erosion alleviates after taking the charge-exchange collision into consideration.