Quasi-Equilibrium Model for Separating the Plasma and the Conductor in the Galatea Device

In order to study the plasma distribution around the conductor coil in Galatea device, a 1-D plasma dynamic model of the linear topological Galatea device is established in this paper, and the static equilibrium analytical solution of this model is derived. The analytical results show that in the vicinity of the conductor coil, the closer to the conductor coil, the greater the plasma pressure is, which causes collision losses due to the plasma concentration on the surface of conductor coil. Therefore, absolute static balance does not exist near the conductor coil. Based on this fact, this paper introduces a quasi-equilibrium model with the plasma separated from the conductor coil by changing its carrying current form. The proposed method is verified by a simulation model established in COMSOL, and the simulation results show that the plasma can be separated from the conductor coil when an increasing current passes through the conductor coil. At the end of this paper, the effects on the separation efficiency of time-varying current with different increasing rate are also given. The duration of the quasi-equilibrium is also analyzed.