FRIB MACHINE PROTECTION SYSTEM DESIGN AND VALIDATION STUDIES

The FRIB heavy ion superconducting linac will become the highest peak power heavy ion beam facility, with beams carrying up to 400 kW power with kinetic energy ≥ 200 MeV/u. Fast protection systems are required to detect and remove beam within 35 s. Detection of beam losses in the low energy linac segment is confounded by two effects: small fluxes of secondary radiation from beam impacts, and large fluxes due to cross-talk from neighboring, higher energy linac sections. We describe a machine protection scheme based on multiple families of diagnostics and diagnostic networks. On-going fault mode studies are utilized to assess risk and to assist in the definition of specific detection networks for high reliability and responsivity.