Wedge Absorbers In Final Cooling For A High-Energy High Luminosity Lepton Collider

TL;DR

This paper explores the use of wedge absorbers in ionization cooling for muon colliders, demonstrating how they can effectively reduce transverse emittance while increasing longitudinal emittance, supported by simulation results.

Contribution

It introduces a novel application of diamond wedge absorbers for final cooling in high-energy muon colliders, with simulation validation.

Findings

Wedge absorbers can reduce transverse emittance to ~25 microns.

Simulation confirms ionization cooling effectiveness with wedge absorbers.

Longitudinal emittance increases by a factor of ~25 during cooling.

Abstract

A high-energy muon collider scenario requires a final cooling system that reduces transverse emittance to ~25 microns (normalized) while allowing longitudinal emittance increase. Ionization cooling using high-field solenoids (or Li Lens) can reduce transverse emittances to ~100 microns in readily achievable configurations, confirmed by simulation. Passing these muon beams at ~100 MeV/c through cm-sized diamond wedges can reduce transverse emittances to ~25 microns, while increasing longitudinal emittances by a factor of ~25. Implementation will require optical matching of the exiting beam into downstream acceleration systems.