Firming up the SSC access shafts calculations

A variety of the Superconducting Super Collider (SSC) access shafts are being designed to provide multi-purpose connections to the underground tunnel. The radiation levels at the top of utility and personnel shafts can exceed corresponding permissible limits even in the presence of reasonable shielding walls between the Collider tunnel and the shaft mouths. A recent calculational exploration of this problem has stimulated searches for a more acceptable layout of these shaft connections to the Collider tunnel. This paper addresses beam-loss scenarios as a source of radiation and the corresponding full-scale simulation results on attenuation properties of various sets of shielding walls at the tunnel level. Also discussed are radiation levels at the top of utility, personnel, ventilation, and delivery shafts for new layouts and updated depths