An Accurate, Simplified Model of Intrabeam Scattering
  Beginning with the general Bjorken-Mtingwa solution for intrabeam scattering (IBS) we derive an accurate, greatly simplified model of IBS, valid for high energy beams in normal storage ring lattices. In addition, we show that, under the same conditions, a modified version of Piwinski's IBS formulation (where dispersion squared over beta has been replaced by the dispersion invariant) asymptotically approaches the result of Bjorken-Mtingwa. 
Karl L. F. Bane