Helical Six-Dimensional Muon Ionization Cooling Channel with Gas-Filled RF Cavities

TL;DR

This paper investigates a six-dimensional muon ionization cooling channel using a helical magnet configuration with gas-filled RF cavities, demonstrating potential for compact, low-emittance muon beams through analytical and numerical methods.

Contribution

It introduces a novel helical magnet channel design with gas-filled RF cavities and explores plasma effects for enhanced beam focusing.

Findings

Analytical and numerical validation of cooling performance

Potential for extremely low emittance muon beams

Identification of plasma-focusing effects in gas-filled cavities

Abstract

A six-dimensional muon ionization cooling in a helical magnet channel has been studied. The cooling performance which is analytically evaluated by solving the exact Hamiltonian is reproduced in numerical simulation. One of the key beam elements for the helical channel is a dense-hydrogen gas-filled RF cavity which realizes a compact cooling channel. Besides, a beam-induced gas plasma in the cavity can generate a plasma-focusing effect. This will generate extremely small betatron function, which realizes extremely low emittance beam.