阳极层霍尔推力器的阳极分段形式对内磁极刻蚀速率的影响

Effects of Anode Segmented Form of Anode Layer Hall Thruster on Etching Rate of Inner Magnetic Pole

关键词:  等离子体  阳极层霍尔推力器  刻蚀速率  PIC模拟  分段阳极

Key words:  Plasma  Anode layer Hall thruster  Etching rate  PIC simulation  Segmented anode

摘要:

推力器内径向电势和等离子体的分布会影响轰击推力器器壁的离子运动，本文通过阳极的不同分段形式来改变推力器内电势分布，进而研究推力器阳极的不同分段形式对内磁极刻蚀速率分布的影响。利用等离子体注入控制技术（PIC）方法研究了入射离子的数量和能量分布，对内磁极内表面和上表面的刻蚀速率进行仿真计算。由结果可知：入射到内磁极两个面上的离子数量和能量都是在三分段阳极时达到最大值，其它三种情况偏低。对于内磁极内表面和上表面的刻蚀速率也是在三分段阳极时最大，其次是单阳极，二分段阳极和四分段阳极的刻蚀速率最小。将单阳极和二分段阳极时刻蚀速率的试验结果进行了对比，验证了此研究结果的正确性，为下一步提高推力器的寿命研究提供了参考数据和研究方法。

Abstract:

Due to the radial potential and plasma distribution in the thruster， the motion of ions that bombard the thruster wall will be affected. The potential distribution in the thruster is changed by different segments of the anode， and then the etching rate distribution of the internal magnetic pole is studied by different segments of the anode. First， plasma injection control（PIC） method is used to study the number and energy distribution of the incidence ions， and then the etching rate of the inner and upper surfaces of the inner pole is simulated. It can be seen from the results that the number and energy of the ions incidence on the two sides of the inner magnetic pole reach the maximum value when the anode is divided into three sections， while the other three cases are relatively low. The etching rate of the inner surface and the upper surface of the inner magnetic pole is also the largest in the three-segment anode， followed by the single anode， and the two-segment anode and the four-segment anode have the smallest etching rates. Finally， by comparing the experimental results of etching rate of single anode and two segmented anode， the correctness of the research results is verified， which provides reference data and research methods for the next step of improving the life of thruster.