Abstract
A novel single-particle technique to measure emittance has been developed and used to characterise seventeen different muon beams for the Muon Ionisation Cooling Experiment (MICE). The muon beams, whose mean momenta vary from 171 to 281 MeV/c, have emittances of approximately 1.5--2.3 \pi mm-rad horizontally and 0.6--1.0 \pi mm-rad vertically, a horizontal dispersion of 90--190 mm and momentum spreads of about 25 MeV/c. There is reasonable agreement between the measured parameters of the beams and the results of simulations. The beams are found to meet the requirements of MICE.
Highlights
A future high-energy Neutrino Factory or Muon Collider will require an intense source of muons
This paper describes measurements of the muon beams that will be used by Muon Ionisation Cooling Experiment (MICE)
Since ionisation cooling depends on momentum, the MICE experiment has been designed to measure the performance of the cell for beams of 140 to 240 MeV/c with large momentum spreads; liquid hydrogen and other low-Z absorber materials will be studied
Summary
A future high-energy Neutrino Factory or Muon Collider will require an intense source of muons. The large volume of phase space occupied by muons at production must be reduced before they are accelerated and stored. The muon beams at the front-end of a Neutrino Factory or Muon Collider will be similar. They are expected to have a very large transverse normalised emittance of εN ≈ 12–20 π mm-rad and momentum spreads of 20 MeV/c or more about a central momentum of 200 MeV/c. The transverse emittance must be reduced to 2–5 π mm-rad (depending on the subsequent acceleration scheme) for a Neutrino Factory [1,2,3,4]. Further transverse and longitudinal cooling is required for a Muon Collider. This paper describes measurements of the muon beams that will be used by MICE
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