A one-dimensional fluid model is developed to better understand the low-frequency ion-ization oscillations in Hall thrusters, which are often called the breathing mode. Although breathing mode has been well observed both experimentally and numerically, understanding its direct cause requires more investigation. The methodology is to apply the fluid model to an unshielded H6 thruster, which is well studied in the past and requires as few unknown parameters as possible. In this paper, sensitivity of individual physical processes in conservation equations, namely, electron temperature, ion temperature, and neutral atom flow velocity, as well as the near-anode anomalous electron transport on the plasma oscillations is discussed.
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