Peking University is designing a new SRF gun that is composed of a quarter wave resonator(QWR) and an elliptical cavity.Compared to the elliptical cavity,the QWR is sufficiently compact at the same frequency and its electric field is quasi-DC.The RF parameters are determined by optimization of QWR cavity structure and the possible multipacting locations are analyzed by 2D MP simulation.The simulation results show that multipacting is not a critical issue for our optimized cavity structure.
