Nuclear Science User Facilities 40 ION BEAM CAPABILITIES NSUF AT WORK When U.S. Department of Energy Office of Nuclear Energy (DOE-NE) leaders needed expert input on how to prioritize the importance of domestic ion beam irradiation capabilities, they called the NSUF – and NSUF ion beam research capabilities experts answered the call. The NSUF, at the request of DOE-NE, held an Ion BeamWorkshop in March 2016 in Idaho Falls, Idaho. The workshop was organized at the direction of DOE-NE to develop a set of recommendations for prioritizing domestic ion beam irradiation capabilities available to researchers. Domestic ion beam capabilities are focused on the support of nuclear energy research and development, both of which are key to DOE-NE’s missions. DOE-NE intends to use the input provided by the workshop when deciding how to best use NSUF ion beam capabilities, instruments, and facilities.A cross section of the ion beam community participated in the workshop. Thirty-three members of the ion beam community attended the invitation-only workshop. Attendees represented 15 operating and proposed ion beam facilities, six DOE-NE research and development (R&D) programs, the Electric Power Research Institute, and the chairs of the NSUF Users Organization and the NSUF Science Review Board. Three members of the sponsoring agency, the Office of Science and Technology Innovation (DOE-NE-4), also attended the workshop. Consensus Criteria The workshop participants developed by consensus a list of ten criteria against which to compare the various ion beam facilities.The criteria are tied directly to ion beam capabilities that support DOE-NE’s mission and thus will help DOE-NE understand the Brenden Heidrich Capabilities Scientist