Prior experiments have demonstrated that the pole in a magnetically shielded Hall thruster sputters and erodes visibly, in contrast with that in an unshielded thruster. To determine the reason for this, a particle-in-cell simulation was conducted, and the difference between shielded and unshielded thrusters in terms of plasma behavior near the exit plane was studied. The results show that in the case of the magnetically shielded thruster, the ion flux peak is on the magnetic pole face with higher ion energy, indicating severer erosion at the pole. By contrast, the flux peak of the unshielded thruster is on the head face of the channel wall, indicating severer bombardment at the wall and milder erosion at the pole. Therefore, pole erosion occurs in the magnetically shielded thruster, and channel head face erosion can be observed in the unshielded thruster. In addition, the simulation results indicate that the greater the outward shift of the magnetic field, the severer the pole erosion.

中文翻译：

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磁屏蔽和非屏蔽霍尔推力器中磁极腐蚀的模拟

先前的实验表明，与非屏蔽推进器相反，磁屏蔽霍尔推进器中的磁极会发生明显的溅射和腐蚀。为了确定其原因，进行了单元内粒子模拟，并研究了在出口平面附近的屏蔽和非屏蔽推进器之间的等离子行为方面的差异。结果表明，在磁屏蔽推进器的情况下，离子通量峰位于具有较高离子能量的磁极面上，表明磁极处的腐蚀更严重。相比之下，未屏蔽推进器的通量峰值在通道壁的端面上，表明在壁处的轰击更猛烈，在磁极处的侵蚀更缓和。因此，在磁屏蔽推进器中会发生磁极腐蚀，在非屏蔽推进器中可以观察到通道头部表面腐蚀。此外，仿真结果表明，磁场的向外偏移越大，磁极腐蚀越严重。