During the first three years since May 2022, FRIB has been operating safely meeting expectations of both scientific and industrial users with high machine availability, while ramping up the beam power to 20 kW for heavy ions including uranium. The paper summarizes the operational experience and challenges, accelerator improvement projects, expansions in user stations, accelerator R&D and workforce growth programs, and preparation for facility upgrades.

The Facility for Rare Isotope Beams has begun operations for scientific users since May 2022. To reduce beam loss in the driver linac, we plan to operate two multi-gap bunchers (MGBs) at a higher accelerating voltage. This paper presents progress and lessons learned from the early-stage operations of the MGBs, as well as a summary of the phased high-power conditioning, which progressed from an RF power of 18 kW to 26.5 kW, and then to 30 kW. Both MGBs were successfully conditioned during maintenance periods. After approximately 100 hours of conditioning, MGB1 operated without any trips in the last 12 hours, and MGB2 experienced only three trips during the same period.