Intra-beam scattering studies for low emittance at BAPS

The target parameters of modern ultra-low emittance storage ring light sources are entering into a regime where intra-beam scattering (IBS) becomes important and, in the case of the Beijing Advanced Photon Source (BAPS), which is being designed at the Institute of High Energy Physics (IHEP), even a limitation for achieving the desired emittances in both transverse planes at the diffraction limit for X-ray wavelengths (approximate to 10 pm). Due to the low emittance, the IBS effect will be very strong. Accurate calculations are needed to check if the design goal (epsilon(h)+epsilon(v)=20 pm) can be reached. In this paper, we present the results of numerical simulation studies of the IBS effect on a BAPS temporary design lattice.