Design and Simulation Study of MITL for a Multistage FLTD in a Series

The structure and size of secondary magnetically insulated transmission line (MITL) were determined through theoretical calculations based on single-module parameters of a 300-kA/100-ns fast liner transformer driver (FLTD) and a second-order equivalent circuit model. A particle simulation model of secondary MITL for a 10-stage FLTD in a series was also established. The output characteristics and MITL working conditions of the 10-stage FLTD under different loads were discussed. The simulation results showed that the 10-stage FLTD carries an approximately matched electron beam diode. The load peak voltage, load peak current, and peak power are 1.02 MV, 224 kA, and 221 GW, respectively. The leading edge of voltage is 40 ns. However, electron charges undermatching case are distributed in a small area of MITL cathode surface. The proportion of electron charge current in the total current decreases significantly.