Simulation of a MILO with self-consistent plasma formations and comparison to experiment

Summary form only given, as follows. Experimental and computer simulation results on a magnetically insulated transmission line oscillator (MILO) have indicated that the large beam current density emitted from each end of the cathode leads to anode plasma formation. This initiates bipolar space-charge flow in the anode-cathode (A-K) gap that severely perturbs the electron flow at the launch point. The result is significant microwave power reduction on a 600-ns time scale. The field-shaper cathode, used previously to extend the MILO RF pulse duration beyond 400 ns, is shown to have several deficiencies concerning anode plasma formation. We report on simulations that explain the power reduction in the MILO and possible ways to minimize anode plasma.