Studies of Limits on Uncontrolled Heavy Ion Beam Losses for Allowing Hands-On Ma

Studies of Limits onUncontrolled Heavy Ion Beam Losses for Allowing Hands-On Maintenance in a Rare Isotope Beam Facility LINAC Limits on uncontrolled heavy-ion beam losses will be estimated for heavy-ion beams when accelerated by a generic exotic beam facility LINAC. For existing proton facilities having beam energies of ~ 1 GeV, several studies have determined that the power lost per meter must be limited to 1 W/m to allow hands-on maintenance. The hands-on maintenance dose rate limit is 100 mrem per hour at 30 cm after 4 hours. Our objective is to confirm this conclusion for proton beams and to extend the study for beams of heavier ions. Detailed neutronic and activation simulations will be carried out to determine the allowed absolute number of particles lost per second per meter of beam line, the allowed percentage loss of total beam, and the resulting dose rates from activated components. The potential impact of this work is on accelerator beam dynamics studies and on accelerator operations. Planned Scope of Work: This research will provide accelerator designers and operations managers with limits on uncontrolled losses of accelerated light and heavy ion beams so that personnel can plan for hands-on routine maintenance and repair work.