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Deterministic, direct kinetic models are of interest in the simulation of plasma physics in a Hall effect thruster because of the lack of statistical noise that inherently exists in particle methods. The present study is concerned with the evaluation of a hybrid-direct kinetic (DK) model through comparison with a hybrid Particle-in-Cell (PIC) model, both of which utilize identical quasi one-dimensional electron fluid algorithms and similar boundary conditions and threshold values for simulation kinetics. The two-dimensional, axisymmetric DK and PIC schemes are employed to model the ions and neutral atoms in a Hall thruster channel and its near-field plume. Results show reasonable agreement in time-averaged plasma properties, suggesting that the hybrid-DK method can be used as an alternative to the standard hybrid-PIC method to model the physics in Hall thrusters. Furthermore, timedependent hybrid-DK properties show smooth behavior that are free of the statistical fluctuations seen in the PIC results. However, analysis of the time-dependent properties shows that the performance of the hybrid-DK method is sensitive to boundary conditions and threshold values. Therefore, further investigation is required to verify that the present hybrid-DK simulation accurately models the evolving physics in a Hall thruster.

Comparing Two-Dimensional, Axisymmetric, Hybrid-Direct Kinetic and Hybrid-Particle-in-Cell Simulations of the Discharge Plasma in a Hall Thruster