Simulation of Space charge effect in single-sided multipacting phenomenon using CST PIC STUDIO software

Multipacting which occurs due to high amplification in secondary electrons, is a typical phenomenon in the radiofrequency structures. The Coulomb force between the secondary electrons induces space charge and consequently saturates the multipacting phenomenon. A realistic study of this phenomenon requires considering the effect of space charge. Simulation of the space charge effect by CST PIC STUDIO software is not simply possible and pose some challenges for users. In this paper, it is described how to consider space charge in a single-side multipacting simulation for a simple model. The effect of space charge on the simulation results has been investigated and the threshold of the the radio frequency field amplitude for multipacting occurrence has been obtained.