Dependence of Characteristics of Br-Type Magnetically Insulated Diode on Configuration of Insulating Magnetic Field

Characteristics of Br-type magnetically insulated diode have been evaluated for two types of insulating magnetic field geometry. For type 1, where the magnetic flux of the Br-field is constant in radius and magnetic field lines are almost parallel to the anode surface, the diode turns on with large delay time. For type 2, where magnetic flux increases with radius, initial irradiation of electrons on the anode occurs in early pulse, which helps to produce anode plasma and reduces turn-on delay. High-efficiency beam generation has been observed in type 2. Using single-particle simulation, the dependence of the characteristics of electron irradiation on the anode was estimated, and the results qualitatively agree with those of the experiment. Beam divergence and deviation angles were measured using a multipinhole energy spectrometer, and no clear difference was observed between the two types of field geometry.