| Citation: | HU J，GENG H，WANG D S，et al. Characteristic analysis and diagnosis of double charged ions of continuous variable-thrust ion thruster[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（12）：3303-3310 （in Chinese）
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The double charged ion in the beam of ion thruster not only restricts the working life of the grid components but also affects the actual thrust of the thruster, and its proportion in the total beam directly determines the conformity of the key performance such as thrust and life of the thruster. In order to evaluate the double charged ion ratio of a 10 cm xenon ion thruster in the wide range of thrust adjustment processes accurately and rapidly, the variation characteristics and influencing factors of double charged ions during variable thrust adjustment of thruster are analyzed by using the empirical model of discharge chamber, and the theoretical proportion of double charged ions at different thrust points was obtained by calculating the actual working parameters. The experimental results are compared with the results of the theoretical calculations based on it, and the experimental proportion of double charged ions at matching thrust locations was acquired using the E-B probe diagnostic system. Results showed that: the proportion of double charged ions in ion thruster is a function of propellant utilization efficiency in discharge chamber and electron temperature, primary electron and maxwell electron density ratio. Additionally, as the anode power in the discharge chamber rises during the variable thrust adjustment process, the proportion of double-charged ions in the beam also rises. This proportion exhibits a strong nonlinear distribution, with an upward trend overall. The above research will certainly provide technical support for the optimal design of an on-orbit control strategy for ion thruster and its performance evaluation.
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