Electromagnetic and quasi-static simulations of ion diodes

Two types of numerical simulations of ion diodes have been performed, one with the DI0DE-2D magneto- and electro-static code, and the other with the MASK electromagnetic code. We present a brief description of the two codes and results of recent simulations. These include quasi-static simulations of pinch-reflex-diodes, which indicate that efficiencies approaching 50% may be achieved in operation at 4Ω and 1.8 MeV, and electromagnetic simulations of bi-polar flow in planar diodes, which indicate that the electron-ion flow filaments and may be an inherent source of ion beam divergence.