Intense-electron-beam transport control through an insulator beam collimator

In this paper we present a new interesting physics in an intense-electron-beam transport control using an insulator collimator: the ion extraction from a plasma generated at the insulator surface is self-regulated by the net space charge of the electron beam in order for the effective charge neutralization. A part of beam electrons hits the insulator surface, and the electron charge accumulated at the insulator surface creates the local discharges. The discharges produce the plasma at the insulator surface. This paper also presents a plasma generation effect at the insulator guide surface on an intense-electron-beam transportation through the insulator beam guide. The ion extraction from the plasma is delayed by the plasma-generation time. The simulation results present that 1) the self-regulated space-charge neutralization, 2) the simplicity of the system, and 3) the head of the electron beam pulse is used to generate the plasma.