A Three-Dimensional Numerical Study on Divergence Characteristics of Two-Grid Ion Optics
- Paper number
IAC-08.C4.4.8
- Author
Dr. yibai wang, Beijing University of Aeronautics and Astronautics, China
- Coauthor
Dr. chang liu, China
- Coauthor
Prof. zuo gu, China
- Coauthor
Mr. ning guo, China
- Coauthor
Prof. haibin tang, China
- Year
2008
- Abstract
A three-dimensional particle simulation code with charge-exchange collision has been developed to model two-grid ion optics system in the paper. The code uses Particle-In-Cell method to simulate the ion trajectories and Monte Carlo technique to model the charge-exchange collision. Linked list storage structure was adopted to save the information of particles calculation results. The simulations were performed on a 20cm ion thruster using xenon as the propellant. Three-dimensional divergence characteristics of ion particles in the two-grid optics were investigated. The equipotential contours between the grids and the distribution of xenon ion particle density were presented. Calculation results demonstrate that the ion beamlets successfully cross over the grid apertures without any impingement under given geometry parameters and grid voltages. When screen-to-accelerator grid separation is 0.44mm and accelerator grid aperture diameter is 1.3mm, the simulation results show good focusing characteristics of ion beamlets in the field. The influences of charge-exchange collisions and the effects of the accelerator grid voltage were also studied in this paper. It is found that the accelerator grid voltage not only affects the particles distribution, but also changes the accelerator grid current. It is shown that the higher the accelerator grid voltage chooses, the smaller the current of accelerator grid is.
- Abstract document
- Manuscript document
IAC-08.C4.4.8.pdf (🔒 authorized access only).
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