Simulation of the Pion Decay Channel of a Neutrino Factory

In the pion decay channel of a neutrino factory the particles are transported in a solenoidal magnetic field, a 1.8 T constant field in the CERN reference scenario. Increasing the field strength decreases the transverse emittance of the decay muons. To define a lower limit on the achievable u emittance, the reference scenario is compared with a study case where pions decay in a field of 20 T. This simulation shows that in any realistic scenario the u emittance will only reduced by less than 21 in each transverse plane as compared to the reference scenario, and at the expense of an increase in longitudinal emittance.