The FMIT Accelerator Vacuum System

The Fusion Materials Irradiation Test (FMIT) Facility accelerator is being designed to continuously accelerate 100-mA deuterons to 35 MeV. High vacuum pumping of the accelerator structure and beam lines will be done by ion pumps and titanium sublimation pumps. The design of the roughing system includes a Roots blower/mechanical pump package. For economy the size of the system has been designed to operate at 10-6 torr, where beam particle scattering on residual gases is negligible. For minimum maintenance in this "neutron factory," the FMIT vacuum system is designed from the point of view of simplicity and reliability.