Influence of magnetic field of a radial focusing external magnetically insulated diode on emission behavior of intense pulsed ion beam

We investigated the effect of magnetic field in the anode and cathode gap (A-C gap) of a radial focusing (Br) external magnetically insulated diode on the emission behavior of IPIB. The magnetic field distribution between the A-C gap was analyzed by finite element method. The non-uniform magnetic field distribution induced the stronger ion emission at the outer ring area of the anode. It revealed the reason for the more serious depletion of the anode outer ring. Within the magnetic induction intensity less than 1.37 Bcrit, it was found experimentally that the diode voltage and ion beam density reached a higher value with the increase of magnetic field. A smoother surface of Al2O3 ceramic was observed after the irradiation of IPIB generated by the Br diode. The study provides guidance for optimizing ion emission uniformity and efficiency of Br diode, promoting the effective application of IPIB technology in materials science.

Automated summary

We investigated the effect of magnetic field in the A-C gap of a radial focusing external magnetically insulated diode on the emission behavior of IPIB. The non-uniform magnetic field distribution induced stronger ion emission at the outer ring area of the anode, leading to more serious depletion of the anode outer ring. The experimental results showed that the diode voltage and ion beam density increased with the increase of magnetic field.