Collective Effect Studies of a Beta Beam Decay Ring

TL;DR

This paper investigates the potential of a Beta Beam decay ring for neutrino experiments, analyzing ion containment, beam stability, and the technical challenges involved in optimizing the ring's performance.

Contribution

It introduces a comprehensive analysis combining analytical and simulation methods to evaluate the decay ring's capacity and stability constraints for next-generation neutrino facilities.

Findings

High ion containment is feasible with optimized ring parameters.

Transverse beam instabilities are a significant challenge requiring impedance control.

Achieving the necessary beam stability demands stringent impedance limits.

Abstract

The Beta Beam, the concept of generating a pure and intense (anti) neutrino beam by letting accelerated radioactive ions beta decay in a storage ring called the Decay Ring (DR), is the basis of one of the proposed next generation neutrino oscillation facilities, necessary for a complete study of the neutrino oscillation parameter space. Sensitivities of the unknown neutrino oscillation parameters depend on the DR's ion intensity and of its duty factor (the filled ratio of the ring). Different methods, including analytical calculations and multiparticle tracking simulations, were used to estimate the DR's potential to contain enough ions in as small a part of the ring as needed for the sensitivities. Studies of transverse blow up of the beams due to resonance wake fields show that a very challenging upper limit of the transverse broadband impedance is required to avoid instabilities and beam loss.