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

由于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离子的运动,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的刻蚀速率分布。首先利用PIC方法研究入射离子的数量和能量分布,接着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,其他三种情况偏低。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,而二、四分段阳极时的刻蚀速率最小。最后通过单阳极和二分段阳极时刻蚀速率的试验结果对比,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。

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

Because the movement of ions bombarding the thruster wall is affected by the radial potential and the plasma distribution. In this paper, 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, PIC method is used to study the number and energy distribution of the incident 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 incident 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 and upper surface of the inner pole is also the highest in three section anode, followed by single anode, and the lowest in two and four section anode. Finally, by comparing the experimental results of the time corrosion 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.