Reduction of angular spread at nonadiabatic electron motion in magnetically insulated diode

Behaviour of the electron pitch-angle is investigated by analytical and numerical methods for the case of a magnetically insulated diode with a ribbon geometry. It has been shown that at the boundary of the adiabaticity of the electron motion the angle can be reduced in many times by a choice of a special nonhomogeneity of the magnetic field. Analytic expressions for the final pitch-angle of the beam electrons are given.