  The Hefei Advanced Light Facility (HALF) will be a VUV and soft X-ray
diffraction-limited storage ring (DLSR), and its high density of electron
bunches makes the intra-beam scattering (IBS) effect very serious. In this
paper, an IBS module used in the IMPACT code is developed, where the scattering
process of IBS is described by the Piwinski model in Monte Carlo sampling. For
benchmarking, the IMPACT code with IBS module is compared with the ELEGANT code
and a semi-analytic code using Bane's model. Then, the results of IBS effect in
the HALF storage ring studied by this new code are presented. With various
countermeasures, the IBS impact can be controlled to a certain extent, and the
expected beam emittance is approximately 59 pm.rad.
