低功率平板型霍尔推力器等离子体束流加速机制研究

In order to reveal the beam acceleration mechanism of planar Hall thrusters and provide a performance optimization method， this paper studied the beam characteristics of planar Hall thrusters under different working conditions by using Faraday probe， E × B probe and thrust stand experiment system. The distribution of characteristic parameters of microscopic plasma discharge was obtained by particle-in-cell simulation. The results show that the beam of the planar Hall thruster has a unique ‘epsilon’ shape. The beam divergence angle is approximately 70° at the measured flow rates and increases with the increase of the flow rate.The separation of ionization regions and acceleration regions causes the beam ion energy to increase first and then decrease with the increase of the flow rate. The thruster performance test results show that the planar Hall thruster exhibits significant multivalent ionization with increasing flow rate. The increases of the voltage utilization and propellant utilization balance the decrease in current utilization and beam divergence efficiency， resulting in an increase in specific impulse and anode efficiency with increasing flow rates.