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US Muon Workshop 2021: A road map for a future Muon Facility

The workshop titled "US Muon Workshop 2021: A road map for a future Muon Facility" was held virtually on February 1-2, 2021. The workshop aimed to bring together world experts in muon spectroscopy ($μ$SR) and other techniques along with interested stakeholders to evaluate the scientific need to construct a new $μ$SR facility in the United States (US). The more than 200 participants highlighted several key scientific areas for $μ$SR research, including quantum materials, hydrogen chemistry, and battery materials, and how each area could benefit from a new, high flux pulsed muon source. Experts also discussed aspects of the $μ$SR technique, such as low-energy $mu$SR, novel software developments, and beam and detector technologies that could enable revolutionary advances in $μ$SR at a next-generation facility. The workshop concluded with discussion of a concept being developed for a new $μ$SR facility at the Spallation Neutron Source (SNS) of Oak Ridge National Laboratory (ORNL). That novel design concept was first envisioned by many of the same $μ$SR experts at a workshop held previously at ORNL in 2016. The participants expressed that the current design had the potential to be a world-leading $μ$SR facility, and strongly encouraged the principal investigators to continue their work in order to refine the concept and determine instrument parameters that would enable new scientific opportunities.