Abstract:  Magnetic screen is an important part of magnetic circuit system, and its sizes have an important influence on magnetic flux density distribution.In order to explore the influence law, a low-power Hall thruster was chosen as the research object.First, the finite element software Maxwell was used to simulate the magnetic flux density distributions under different axial and radial sizes of the magnetic screens.The results showed that there was a set of dimensions that could create the best magnetic field configuration for the thruster.Then, PIC method was employed to simulate the distributions of plasma parameters at 200V anode voltage and 0.8mg/s gas flow rate in the discharge channel with the dimensions as the design standard.Finally, according to the ion velocity and ion number density distributions, the calculated thrust, anode specific impulse, and anode efficiency were respectively 6.9mN, 880s, and 41.89%.This simulation study provides a theoretical basis for magnetic field design of Hall thruster and a numerical reference for future experimental research.

Key words: Hall thruster, magnetic field design, magnetic screen, magnetic field configuration, plasma parameter distribution