Effect of a nonadiabatic magnetic field on the amplitude of cyclotron motion

Abstract This analysis extends the previously published study of the effect of a nonadiabatic magnetic field on the electron beam for different electron beam currents. Specifically, it presents 2-dimensional maps of relative amplitudes of radial beam oscillations in a space defined by nonadiabatic magnetic field strengths and electron beam currents. As before, the electron gun and the drift region are immersed in a uniform magnetic field to avoid distorting the cyclotron motion. Unlike in the previous paper, the cathode of the electron gun has a radius of 3 mm, which is more suitable for EBIS applications. These maps show the operating range of such an optical system with a nonadiabatic magnetic field and the options of optimizing the nonadiabatic coil strength and position for different electron beam currents.