Design and Performance of the New FRIB Fragment Separator, ARIS*

In 2022, the facility for Radioactive Isotope Beams (FRIB) has commissioned a new linac and high resolution spectrometer called the Advanced Rare Isotope Separator known as ARIS. The linac will provide up to 400 kW of various species of heavy stable beams with energies in the range of 200 AMeV to the target at the entrance of the separator to produce a wide array of fast secondary radioactive beams. ARIS was designed to operate up to a rigidity of 8 Tm and consist of two- or three-separation stages to optimize experimental parameters. The multistage design allows for different optics modes that can result in momentum compression or high resolving power. The facility has already recommissioned several existing beamlines from the former National Super Conducting Laboratory (NSCL) and delivered its first rare isotopes to experiments based on these new optics modes. An overview of the new fragment separator and operation experiences since 2022 as the facility continues to ramp up to the design specifications as well as planned future upgrades will be presented.