Abstract
The strength and shape of the magnetic field are the core factors in the design of the Hall thruster. However, Hall current can affect the distribution of static magnetic field. In this paper, the Particle-In-Cell (PIC) method is used to obtain the distribution of Hall current in the discharge channel. The Hall current is separated into a direct and an alternating part to calculate the induced magnetic field using Finite Element Method Magnetics (FEMM). The results show that the direct Hall current decreases the magnetic field strength in the acceleration region and also changes the shape of the magnetic field. The maximum reduction in radial magnetic field strength in the exit plane is 10.8 G for an anode flow rate of 15 mg/s and the maximum angle change of the magnetic field line is close to 3° in the acceleration region. The alternating Hall current induces an oscillating magnetic field in the whole discharge channel. The actual magnetic deformation is shown to contain these two parts.
Highlights
Frequency oscillation time scale.[5]
The materials of magnetic circuit is always conducting material, the eddy current in the magnetic circuit could forbidden the oscillation of magnetic field extend to the magnetic circuit, this oscillation magnetic field only extent to the discharge channel and lead to a large percent oscillation of magnetic field close to the anode region, which will affect the electron energy and transport in ionization region change the stability of discharge.[2,3]
Few authors[4,11] have used MagNet[6], a commercial software, to simulate the magnetic field. These methods only evaluate the average effect of Hall current for the static magnetic field of thruster and ignore the low frequency fluctuations in magnetic field induced by the Hall current
Summary
Few authors[4,11] have used MagNet[6], a commercial software, to simulate the magnetic field These methods only evaluate the average effect of Hall current for the static magnetic field of thruster and ignore the low frequency fluctuations in magnetic field induced by the Hall current. For this reason, this paper calculates the distribution of Hall current using Particle-In-Cell (PIC) and Monte Carlo Collisions (MCC) method in low frequency oscillation scale and uses Finite Element Method Magnetics (FEMM),[12] which is a free software, to calculate the magnetic field deformation including the shape and strength, induced by the direct and alternating Hall current separately.
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