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首页> 外文会议>AIAA/ASME/SAE/ASEE joint propulsion conference exhibit >Fully Coupled Electric Field/PIC-MCC Simulation Results of the Plasma in the Discharge Chamber of an Ion Engine
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Fully Coupled Electric Field/PIC-MCC Simulation Results of the Plasma in the Discharge Chamber of an Ion Engine

机译：离子发动机放电室中等离子体的完全耦合电场/ PIC-MCC模拟结果

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In this paper simulation results for the plasma in the NASA's Evolutionary Xenon Thruster (NEXT) ion engine discharge chamber are presented. The unique aspect of these results is that the Poisson equation solution of the electric field is fully coupled with the particle tracking portion of the particle-in-cell Monte Carlo collision (PIC-MCC) model. This means the effects of charged particles on the electric field are accounted for in a precise, detailed manner. This fidelity of a simulation has never been performed for the plasma in the discharge chamber of an ion engine, until now. In the past, the present authors have presented results where the particle tracking portion of the PIC-MCC solution was weakly coupled to the electric field solution. This approximation was made to reduce the computational time from years to weeks. In this work, full coupling is simulated. The reason this full coupling can be performed in weeks of computational time, instead of years, is the self-similar scaling routine used and the convergence routines used. Many results for the plasma in the discharge chamber are presented in this paper including neutral, first ion, second ion, primary electron, and secondary electron number density distributions; as well as electron energy distributions and, of course, the electric potential distribution. These results are presented for the NEXT throttling level TL35. Our simulation results have been validated against experimental plasma measurements made on the laboratory model NEXT ion thruster at the University of Michigan. In addition, self-consistent ion bombardment sputter yield calcuiations were performed with our PIC-MCC model to compute the erosion profile of the cathode keeper face plate.
机译：本文介绍了NASA进化型氙气推进器（NEXT）离子发动机放电室中等离子体的模拟结果。这些结果的独特之处在于，电场的泊松方程解与单元格内蒙特卡洛碰撞（PIC-MCC）模型的粒子跟踪部分完全耦合。这意味着带电粒子对电场的影响将以精确，详细的方式加以说明。迄今为止，从未对离子引擎放电室中的等离子体执行过这种模拟保真度。在过去，本作者已经提出了其中PIC-MCC解决方案的粒子跟踪部分与电场解决方案弱耦合的结果。进行这种近似是为了将计算时间从几年减少到几周。在这项工作中，模拟了完全耦合。可以在数周的计算时间而不是数年的时间内执行此完全耦合的原因是所使用的自相似缩放例程和所使用的收敛例程。本文介绍了放电室中等离子体的许多结果，包括中性，第一离子，第二离子，一次电子和二次电子数密度分布。以及电子能量分布，当然还有电势分布。针对下一个节流水平TL35给出了这些结果。我们的模拟结果已经在密歇根大学的实验室模型NEXT离子推进器上进行的实验血浆测量得到了验证。此外，使用我们的PIC-MCC模型进行了自洽离子轰击溅射产率计算，以计算阴极支架面板的腐蚀曲线。

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