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离子输运是影响电势阱式双级霍尔效应推力器(DSHET)性能的一个重要物理过程,合理的磁场位形对离子输运有重要影响,为分析其影响机理,通过Langmuir探针诊断实验,分析了不同磁场位形环境下电离级电势阱和中间电极处电势垒等特征参数的变化,同时结合双面探针收集离子定向电流,得到了不同磁场位形下的空间电势分布和中间电极处电势垒大小对离子输运电流的影响关系。实验发现,磁场位形改变对空间电势分布的影响明显。以中间阳极附近的零磁点作为磁场特征参数,在不同磁场工况下,零磁点越接近通道的中心线,则电离级电势阱的分布越均匀,同时中间电极处电势垒也达到最小值(9V),这样的空间电势分布能有效抑制离子在金属壁面上的损失,减小离子输运的阻碍电势垒,可提高离子输运电流10%。研究结果表明双级霍尔效应推力器的离子输运过程主要受电离级电势阱分布均匀性和电势垒大小的影响,磁场位形在一定程度上决定了电势分布,零磁点径向位置应位于放电通道的径向中心位置,这样离子输运最畅通,电离级作用最大化。
Ion transport is an important physical process that affects the performance of the double-well Hall-effect thruster (DSHET). The reasonable magnetic field shape has an important influence on ion transport. To analyze its influence mechanism, the Langmuir probe diagnostic experiment , The change of the characteristic parameters such as the potential barrier at the ionospheric potential well and the intermediate electrode under different magnetic field configurations were analyzed. The ion potential current and the ionization potential under different magnetic field configurations were obtained with the double-sided probe. Influence of the potential barrier size on ion transport current. The experiment found that the change of the magnetic field position has obvious influence on the space potential distribution. Taking the zero magnetic point near the middle anode as the characteristic parameter of the magnetic field, the closer the zero magnetic point is to the centerline of the channel under different magnetic field conditions, the more evenly distributed the potential well and the potential barrier at the middle electrode reach the minimum value (9V). This spatial potential distribution effectively suppresses the loss of ions on the metal wall and reduces the potential barrier of ion transport, thus increasing the ion transport current by 10%. The results show that the ion transport process of two-stage Hall-effect thrusters is mainly affected by the distribution of the potential well and the size of the potential barrier. The configuration of the magnetic field determines the potential distribution to a certain extent. The radial position of the zero-magnetic point should be Located in the radial center of the discharge channel, so that the best ion transport, ionization level to maximize the role.