Plasma Ring Transportation Feature Parameters Optimization and Dynamics Analysis with Multiobjective Particle Swarm Optimization

Plasma accelerator made up by large capacity pulse capacitor and coaxial guns is used to produce high-speed, high-electron-density plasma rings which are widely used in controllable nuclear fusion, astrophysics and aerospace. Miligram-scale plasma can be accelerated to 1000km/s by plasma accelerator in the simulation and experiment. The charge current and axial velocity of the plasma are affected by the nature of the working gas and the characteristic parameters of the plasma accelerator. In this paper, we adopt multi-objective particle swarm optimization to solve the target acceleration project which includes the gas mass, gas nature and the parameters of the capacitor bank circuit in order to control the plasma discharge current and axial velocity at the moment of export. And we analyze the relation the character parameters of the plasma accelerator and the discharge current and the axial velocity of the plasma according to the result of the optimization project. The results show that the plasma discharge current and axial velocity are inversely related in the first-order damping circuits, and it is difficult to fully optimize the desired target by optimizing a single variable, and the target current and velocity can be obtained by optimizing the capacitor bank circuit parameters, which play a decisive role in the plasma discharge current and axial velocity.