Low emittance muon beam in the 2 to 40 GeV energy range for muon and neutrino experiments

TL;DR

This paper proposes a practical scheme to produce low emittance muon beams in the 2 to 40 GeV range using existing technology, enabling early muon and neutrino experiments without the need for cooling.

Contribution

It introduces a novel method to generate low emittance muon beams without cooling, suitable for current technological capabilities and adaptable for precise muon and neutrino measurements.

Findings

Achieves a muon rate of 5x10^4 muons/sec at 22 GeV

Produces a normalized transverse emittance of 5 micrometers

Energy spread of 1 GeV from 10^11 positrons per second at 44 GeV

Abstract

I present a scheme to obtain a 2 to 40 GeV low emittance muon beam, not requiring cooling and within today's technological resources, to be used for early commissioning of muon accelerator projects, or alternatively dedicated muon and neutrino parameter measurements. In particular, a muon rate of 5x10^4 mu/s in a normalized transverse emittance of 5 um at 22 GeV, and energy spread of 1 GeV obtained from O(10^11) e+/s on target at 44 GeV. This emittance is below the expected results of advanced emittance cooling techniques for muons produced from protons-on-target, and represents an alternative for the duration of complete muon cooling studies. The scheme has beam designed to adjust the muon beam energy in the GeV energy range to the needs for precise parameter measurements of muons and neutrinos. Although the rate is small compared to other muon sources, it does not seem to represent a big limitation for its usage. Furthermore, the muon rate could be in principle increased proportionally to the availability of higher positron rates, already foreseen for future collider projects.