Phase rotation of muon beams for producing intense low-energy muon beams

TL;DR

This paper proposes a phase rotation technique using RF cavities to produce intense low-energy muon beams from a pulsed proton source, significantly enhancing muon yield for rare decay experiments.

Contribution

It introduces a novel phase rotation method with RF cavities to increase low-energy muon production from a pulsed proton driver.

Findings

Achieves approximately 0.1 muon per 8 GeV proton.

Significantly higher muon yield than current Mu2e plans.

Enables next-generation rare decay searches.

Abstract

Low-energy muon beams are useful for rare decay searches, which provide access to new physics that cannot be addressed at high-energy colliders. However, muons are produced within a broad energy spread unmatched to the low-energy required. In this paper we outline a phase rotation method to significantly increase the intensity of low-energy muons. The muons are produced from a short pulsed proton driver, and develop a time-momentum correlation in a drift space following production. A series of rf cavities is used to bunch the muons and phase-energy rotate the bunches to a momentum of around 100 MeV/c. Then another group of rf cavities is used to decelerate the muon bunches to low-energy. This obtains ~0.1 muon per 8 GeV proton, which is significantly higher than currently planned Mu2e experiments, and would enable a next generation of rare decay searches, and other intense muon beam applications.