电荷交换离子对栅极系统束流影响的数值研究
Numerical study the influences of charge exchange ions on optical system ion beam
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摘要: 采用二维网格质点法(PIC)计算离子在离子发动机栅极系统中的运动, 通过在模型中添加离子和中性粒子电荷交换的Monte Carlo碰撞模块, 得到了电荷交换离子在栅极周围的分布及电荷交换离子的运动规律.计算结果表明:考虑电荷交换离子后, 屏栅极电流较不考虑电荷交换离子情况时增大了1.42%, 所受影响不大, 加速栅极电流由0增大到主束流电流的1.41%.模拟结果表明:加速栅极下游较远处产生的电荷交换离子, 是造成加速栅极下游面腐蚀及加速栅极电流的主要原因.
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关键词:
- 离子发动机 /
- 栅极系统 /
- 电荷交换离子 /
- 网格质点法 /
- MonteCarlo碰撞
Abstract: Based on particle-in-cell(PIC) and Monte Carlo collision(MCC) method, a two-dimensional numerical model was adopted to investigate the distribution and kinetic characteristics of the charge exchange(CEX) ions in the optical system of ion thruster.The simulation results show that, the screen grid current is increased by 1.42 percent when the CEX ions are considered.On the other hand, the accelerator grid current increases from zero to 1.41 percent of the main beam current.It is indicated from the simulation results that the CEX ions originated in the far downstream region of the optics are the main reason of the accelerator grid current and the erosion on the downstream face of the accelerator grid. -
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