Status and prospects for PRISM

Speaker: Jaroslaw Pasternak

Abstract: Muon to electron conversion in a muonic atom is an excellent laboratory to search for charged lepton flavor violation (CLFV). Its discovery would be a clear sign of physics beyond the Standard Model. In order to further improve the sensitivity of current experiments (COMET and Mu2e) by an additional factor of 100 and study potential signals, it was proposed to use a Phase Rotated Intense Source of Muons (PRISM). In PRISM system short, high intensity proton bunches are sent to a production target followed by a high acceptance capture/transport system, where the muon beam will be formed and subsequently injected into the FFA ring, which will allow significant purification of the muon beam and suppression of a typically large momentum spread by the use of RF phase rotation, both reducing the backgrounds and increasing the efficiency of muon stopping target. PRISM requires a proton driver capable of producing short, intense proton bunches. Development of new facilities, in particular PIP-II at Fermilab equipped with a dedicated accumulator ring, or upgrades of other accelerator facilities, such as J-PARC and ESS, offer promising opportunities for providing the required intensity and time structure of the proton beam for PRISM. This talk presents the current status and prospects for the PRISM R&D work in a near future.