Influence factors on the azimuthally uniform feed in single-point feed induction voltage adder

Achieving an azimuthally uniform feed is of greatly significance for induction cells in magnetically insulated induction voltage adder (MIVA). The azimuthal uniformity of feed currents around cell bores is affected by various factors. In this paper, the effects of several factors, such as adder impedances of the inner stalk, cell locations in multi-stage MIVA systems, and time spreads between parallel driving pulses, on the feed uniformity are simulated and analyzed. The single-point feed MIVA version is chosen as the basis of analysis. A 3D fully electromagnetic model without particle features is developed for a single cell and an adder with three cells in series, respectively. Simulation results demonstrate that, as adder impedances of the inner stalk and load impedances increase, the azimuthal uniformity is improved slightly, i.e., a higher MITL impedance is a bit helpful for current symmetrization. Simulation results also indicate that, the non-uniformity within the first cell is little worse than other cells downstream, however, the effects of cell locations could be negligible. The time spreads between driving pulses for single-point feed MIVA systems nearly not affect the distribution tendency and azimuthal uniformity of feed currents, while badly changing the waveforms and the numerical values of feed currents and cell output voltage.