Estimates of the non-Gaussian beam-tail distributions and the beam lifetime at the Pohang Light Source

A simulation method to obtain the beam-tail distribution and the beam lifetime in electron storage rings has been applied to the 2.5-GeV Pohang Light Source. This simulation makes it possible to investigate the beam-tail distributions using a simple and fast simulation method. The simuations were performed to obtain the transverse and the longitudinal tail distributions due to beam-residual gas bremsstrahlung, beam-residual gas scattering, and intra-beam scattering at the Pohang Light Source. The simulated beam lifetime was estimated to be around 19 hours for a beam current of 180 mA. The simulated beam lifetimes were shown to agree well with those from normal operations.