High Precision Measurement of Muon Beam Emittance Reduction in Mice

Muon ionization cooling, an essential ingredient of a Neutrino Factory, will be demonstrated for the first time by the MICE experiment. The central part of MICE consists of a short section of a Neutrino Factory cooling channel. The emittance reduction achieved in this experiment is quite modest, 10% to 15%. In order to extrapolate the performance of a full cooling channel from these values, it is desirable for MICE to achieve an emittance measurement accuracy of 10^-3, absolute. So far, beam emittance has never been measured with such precision. We present the resulting constraints on the spectrometers and a method to correct the bias on the emittance due to known measurement errors.