Normalized Transverse Emittance Reduction via Ionization Cooling in MICE 'Flip Mode'
March 31, 2022
Low emittance muon beams are central to the development of a Muon Collider and can significantly
enhance the performance of a Neutrino Factory. The international Muon Ionization Cooling
Experiment (MICE) has recorded several million individual muon tracks passing through a liquid
hydrogen or a lithium hydride absorber and has demonstrated the ionization cooling of muon
beams. Previous analysis used a restricted data set, and the beam matching was not perfect. In this
analysis, beam sampling routines were employed to account for imperfections in beam matching
at the entrance into the cooling channel and enable an improvement of the cooling measurement.
A study of the normalized transverse emittance change in the MICE cooling channel set up in
a flipped polarity magnetic field configuration is presented. Additionally, the evolution of the
canonical angular momentum across the absorber is shown and the characteristics of the cooling
effect are discussed.
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