Study of multiple scattering in high magnetic fields

TL;DR

This paper investigates how multiple scattering in high magnetic fields affects muon cooling efficiency, revealing that accounting for helical particle motion improves performance predictions in strong solenoidal fields.

Contribution

It introduces a refined analysis of multiple scattering that includes helical motion, enhancing the accuracy of muon cooling lattice performance predictions in high magnetic fields.

Findings

Helical motion significantly impacts multiple scattering calculations.

Accounting for helical motion improves simulation accuracy.

Cooling performance can be better than standard predictions.

Abstract

Muon cooling for a neutrino factory or muon collider can be achieved using low-Z absorbers in strong focusing fields. Proposed cooling lattices place absorbers in solenoidal fields ranging up to 30 to 40T. The cooling performance of these lattices is determined by the interplay of ionization energy loss and Moliere scattering, but Bethe's classic treatment of Moliere scattering ignores the helical motion of charged particles in solenoidal fields. When this motion is taken into account, the performance of these lattices can be better than predicted by simulations using the standard treatment.