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A particle-in-cell simulation is conducted to investigate plasma acceleration process in a magnetically enhanced micro-cathode vacuum arc thruster. A co-axial electrode thruster structure with an external magnetic field configuration is used to study the influence of magnetic field distribution on the acceleration process of electrons and ions. The modeling results show that due to the small electron mass and the Larmor radius, electrons are magnetized and bound by the magnetic field lines to form a narrow electron channel. The heavy ions with large Larmor radius take a long time to keep up with the electron movement. The presence of magnetic field strengthens the charge separation phenomenon. The electric field caused by charge separation is mainly responsible for the ion acceleration at the downstream of computation. The effect of variations in the magnetic field distribution on acceleration of the plasma is also investigated in this study, it is found the position of magnetic coil relative to the thruster exit has a significant effect on the acceleration of ions. In order to increase the axial component of ion velocity, the design should be considered to reduce confinement of magnetic field on the electrons in the downstream divergent part of applied magnetic field.

The muzzle dynamic recoil device for guns was designed. The optimization of dynamic recoil device was studied in detail. Using the MATLAB optimization toolbox, a series of optimized parameters of dynamic recoil device were got. By compared the results of dynamic recoil test with live-fire of the gun, the rationality and practicability of the dynamic recoil device has been proved. It is also proved that the muzzle dynamic recoil device can meet the dynamic recoil test requirements of guns.