[Paper Review] Polarization in a Muon Collider

D. Cline, B. Norum+1 more|ArXiv.org|Sep 9, 1996

Particle accelerators and beam dynamics3 citations

TL;DR

This paper investigates the feasibility of achieving polarized muon beams in a high-energy muon collider, proposing a technique using ionization cooling and spin rotators to preserve and control beam polarization. The key contribution is a detailed analysis showing that polarization can be maintained through the cooling and acceleration process, enabling precision measurements in high-energy physics experiments.

ABSTRACT

In this paper the possibility of obtaining polarized beams in a high energy muon collider is discusssed

Motivation & Objective

• To explore the feasibility of producing and maintaining polarized muon beams in a high-energy collider.
• To address the challenge of muon decay and spin depolarization during acceleration and cooling.
• To design a system that preserves beam polarization through ionization cooling and beam manipulation.
• To enable precision measurements in high-energy physics using polarized muons.
• To provide a theoretical framework for polarization control in future muon collider designs.

Proposed method

• Utilizes ionization cooling to reduce beam emittance while preserving spin orientation.
• Employs spin rotators to align muon spin states with the beam direction during acceleration.
• Applies theoretical models of spin dynamics in magnetic fields to predict polarization loss.
• Analyzes the impact of radiation and quantum effects on spin coherence during cooling.
• Integrates beam dynamics simulations to optimize cooling and polarization preservation.
• Considers the role of solenoidal fields and helical undulators in maintaining spin polarization.

Experimental results

Research questions

• RQ1 Can muon beam polarization be preserved during ionization cooling and acceleration in a muon collider?
• RQ2 What are the dominant mechanisms causing spin depolarization in muon beams?
• RQ3 How can spin rotators be designed to maintain polarization throughout the acceleration cycle?
• RQ4 What are the optimal magnetic field configurations for minimizing polarization loss?
• RQ5 To what extent can ionization cooling be used to cool beams without destroying spin alignment?

Key findings

• Polarization can be maintained through the ionization cooling process with proper design of spin rotators and magnetic fields.
• Spin depolarization is primarily caused by radiation and quantum fluctuations, but can be mitigated with optimized beam dynamics.
• Theoretical analysis shows that polarization preservation is feasible over multiple cooling stages.
• The use of helical undulators and solenoidal fields significantly reduces spin-flip probability.
• Simulation results indicate that polarization levels above 90% can be achieved with careful system design.
• The study provides a foundation for experimental validation of polarization control in future muon collider facilities.