Positron driven muon source for a muon collider

TL;DR

This paper proposes a positron-driven muon source design for a future muon collider, utilizing a multi-target system to produce and accumulate muons efficiently, addressing key technological challenges.

Contribution

It introduces the Low EMittance Muon Accelerator (LEMMA) concept with a multi-target system for muon production, cooling, and accumulation in a muon collider.

Findings

Design of a high-energy acceptance positron ring.

Multi-target system effectively produces muons at threshold.

Preliminary target material and thickness studies conducted.

Abstract

The design of a future multi-TeV muon collider needs new ideas to overcome the technological challenges related to muon production, cooling, accumulation and acceleration. In this paper a layout of a positron driven muon source known as the Low EMittance Muon Accelerator (LEMMA) concept is presented. The positron beam, stored in a ring with high energy acceptance and low emittance, is extracted and driven to a multi-target system, to produce muon pairs at threshold. This solution alleviates the issues related to the power deposited and the integrated Peak Energy Density Deposition (PEDD) on the targets. Muons produced in the multi-target system will then be accumulated before acceleration and injection in the collider. A multi-target line lattice has been designed to cope with the focusing of both the positron and muon beams. Studies on the number, material and thickness of the targets have been carried out. A general layout of the overall scheme and a description is presented, as well as plans for future R&D.