Coulomb scattering cross sections for accelerator design

It is pointed out that the models commonly used to estimate the Coulomb scattering in the thin foils used for charge exchange injection are barely adequate for the new and proposed intense spallation neutron sources and kaon factories. The modification to the Rutherford cross section due to the screening from the electronic shells has been calculated by an iterative Hartree-Fock method for cases of interest to accelerator designers. These include Be, C, Al, and O foils over an energy range of 0.025 to 1.6 GeV. The differential and total cross sections are compared with earlier models. The best fit to a Thomas-Fermi model for each case is also given for convenient substitution into existing programs and calculations. Some practical examples of the effect on accumulated phase space distributions and beam loss are given for proton accumulation at 450 MeV. The situation considered represents a possible stage in the accumulation of charge for the TRIUMF kaon factory.<
>