FRIB’s fifth Accelerator Readiness Review (ARR05) was held 21-22 April to assess FRIB’s readiness to operate all segments of the superconducting linear accelerator, including all 46 beam-accelerating cryomodules along with four superconducting dipole magnets.

The ARR05 scope included six beta=0.53 cryomodules, warm sections between cryomodules, and the beam transport line in folding segment 2 and linac segment 3 to the beam-delivery system beam dump, in addition to scope for the first four ARRs (ARR01, ARR02, ARR03, ARR04).

The review committee comprised seven reviewers affiliated with Brookhaven National Laboratory, Fermi National Accelerator Laboratory, Oak Ridge National Laboratory, and the Massachusetts Institute of Technology’s Laboratory for Nuclear Science. The review was observed by representatives from MSU and the U.S. Department of Energy Office of Science.

The review committee answered all ten charge questions affirmatively, with one pre-start recommendation and two post-start recommendations. The review committee recommends FRIB commissioning commence when the pre-start recommendation is addressed and verified as closed.

As FRIB prepares for operation, several stages of commissioning (integrated testing of individual devices and beam commissioning of devices working together) are conducted to demonstrate readiness of the different segments of the accelerator. Integrated testing examines the functionality of the system.

The next ARR (ARR06) is scheduled for fall 2021.