Front End for a Neutrino Factory or Muon Collider

TL;DR

This paper discusses the design of the front end for a neutrino factory or muon collider, focusing on muon capture, bunching, phase-energy rotation, and initial cooling, with emphasis on the HFOFO Snake cooling channel.

Contribution

It presents a detailed design and analysis of the front end components, including the capture, bunching, and cooling systems, for muon-based facilities.

Findings

Development of scenarios for muon capture and initial cooling.

Identification of rf limitations and transport losses.

Proposal of the HFOFO Snake cooling channel design.

Abstract

A neutrino factory or muon collider requires the capture and cooling of a large number of muons. Scenarios for capture, bunching, phase-energy rotation and initial cooling of {\mu}'s produced from a proton source target have been developed, initially for neutrino factory scenarios. They require a drift section from the target, a bunching section and a {\phi}-{\delta}E rotation section leading into the cooling channel. Important concerns are rf limitations within the focusing magnetic fields and large losses in the transport. The currently preferred cooling channel design is an "HFOFO Snake" configuration that cools both {\mu}+ and {\mu}- transversely and longitudinally. The status of the design is presented and variations are discussed.