Plasma Diffused from External Flowing Plasma

抄録

The relationship of ion-flux ratio and electric current with plasma flow has been investigated using the one-dimensional particle-in-cell simulation. The internal region between a pair of face-to-face electrodes, which are electrically connected to each other, is filled with a plasma diffused from an external flowing plasma with Mach number M_∞ ≤ 2. The ion-flux ratio of the upstream and downstream electrodes agrees with the prediction of the Stangeby fluid model for M_∞ ≤ 1.2, and is higher than the prediction for larger M_∞. The electric current linearly increases with increasing M_∞ for M_∞ ≤ 1 and reaches the maximum value at M_∞ ∼ 1.7. The dependence of the electric current on the Mach number is partly explained by the double probe theory.