Preparation of start-to-end simulation for compact ERL

For the preparation of start-to-end simulation (S2E) for a synchrotron light source based on Energy Recovery Linac (ERL), particle tracking simulations were carried in a main super conducting RF cavity (SRF) section and an arc section for the compact ERL (cERL). Since the beam energy after the main SRF section is limited to be 35 MeV for the early stage of the machine commissioning of the cERL, space charge effect after acceleration can not be ignored. To study the space charge effect after acceleration, the particle tracking was carried out using General Particle Tracer (GPT) with mesh based method to calculate space charge effect. As a result of the tracking in the main SRF section and the arc section, the distortion of the betatron function caused by space charge was observed, when the kinetic energy of the bunch was less than 125 MeV.