Primary beam development for FRIB experiments

Since starting the user operation of Facility for Rare Isotope Beams (FRIB) at Michigan State University in May 2022, the driver linac has provided more than a dozen ion beam species from Oxygen to Uranium to the production target. FRIB has routinely provided 20 kW primary beams on target since March 2025, which is a factor of 20 higher than at the beginning of scientific user operation. In this presentation, the recent progress of FRIB driver linac beam development, a discussion of efficient primary beam tuning procedures based on physics applications, and accelerator improvement projects for low-loss accelerator will be discussed.