Modeling and Theoretical Studies on Beamed-Induced Plasma

Modeling and theory for millimeter-wave discharge were described to understand the plasma-formation physics at over- and under-critical intensities. On overcritical discharge, plasma fluid or particle model was combined with electromagnetic wave propagations via a current-density feedback. Simulation results and theory indicated that electron-impact ionization, electron diffusion, and wave reflection caused the propagation of the ionization front. On the other hand, at under-critical conditions, modeling studies revealed that neutral gas dynamics, excitation reaction, and photon transport played important roles on the propagation of the ionization front.