Simulative study on the temporal evolution of the axial cathode plasma expansion velocity in pulsed magnetically insulated coaxial diode through voltage-ampere characteristics

摘要

A scaled-down particle-in-cell (PIC) simulation model is built to investigate the temporal evolutions of the axial cathode plasma expansion velocity through voltage-ampere characteristics in a pulsed magnetically insulated coaxial diode (MICD). The diode structure, voltage-ampere characteristics and cathode plasma expansion mechanism of MICDs are more complex than that of planar diodes. Unlike planar diodes, the axial plasma expansion velocity is difficult to investigate individually for MICDs. In this paper, the axial temporal evolution trend of “V”-shape profile and time-averaged velocity are studied through voltage-ampere characteristics method, which are confirmed by the linear ion density method.