Transport control of intense electron beam using insulator guide

We present a new interesting feature in an intense-electron-beam transportation system using an insulator guide: 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. This paper also presents a numerical study on a plasma generation effect at the insulator guide surface on an intense-electron-beam transportation through the insulator beam guide. The plasma at the insulator surface is generated by the local electric field which is created by beam electrons. The ion extraction from the plasma is delayed by the plasma-generation time. The simulation results present that 1) the head of the electron beam pulse is used to generate the plasma, and 2) the electron beam transport efficiency is not fatally but slightly degraded.