Bright muon beams and muon colliders

Muon collider (MC) technology must overcome several significant challenges to reach the maturity of electron-positron colliders. An increased level of R&D effort is justified at the current time, because the muon collider promises an alternative path toward high-energy, high-luminosity lepton collisions that extends beyond the expected reach of linear colliders. The strong suppression of synchrotron radiation compared to electrons allows beam acceleration in rings making efficient use of the RF systems for acceleration. The overall power consumption of a 10 TeV MC is expected to be lower than that of CLIC at 3 TeV. Additionally the beam can repeatedly produce luminosity in two detectors in the collider ring. The ratio of luminosity to beam power is expected to improve with collision energy, a unique feature of the MC. The compactness of the collider makes it plausible that a cost effective design might be achieved; however this must be verified with more detailed estimates. If the technical challenges can be overcome, the MC offers a potential route to long-term sustainability of collider physics.
CERN Yellow Reports: Monographs, Vol. 1 (2022): European Strategy for Particle Physics - Accelerator R&D Roadmap