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MICE: Its Program of Ionization Cooling Measurements in the Subsequent Steps
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Nuclear Physics B (Proc. Suppl.) 229–232 (2012) 531 www.elsevier.com/locate/npbps
MICE: Its Program of Ionization Cooling Measurements in the Subsequent Steps Pavel Snopok, for the MICE Collaboration Department of Physics and Astronomy, University of California, Riverside, CA 92521
Abstract The Muon Ionization Cooling Experiment collaboration is constructing a complete unit cell of a muon ionization cooling channel. The set of cooling experiments to be performed and the progress on the construction are described. Keywords: MICE, Muon Ionization Cooling Experiment, ionizaion cooling, Neutrino Factory, muon beam
Figure 1: MICE implementation schedule
Neutrino Factory (NF) will produce the most intense and focused neutrino beam ever achieved by the decay of stored muons. Using this neutrino beam, the parameters of neutrino oscillations and CP-violation for leptons can be precisely measured. The transverse phase space of the initial muon beam needs to be reduced (cooled). The only cooling technique fast enough to cool within the muon lifetime is the ionization cooling. The objectives of the Muon Ionization Cooling Experiment[1] (MICE) are to design, engineer and fabricate a section of the cooling channel capable of giving the desired performance for a NF; to test it in a muon beam; to measure a 10% reduction in emittance of the beam with a precision of 1%; and to develop simulation and data analysis software. MICE is being implemented in Steps (Fig. 1). Step I measures the particle content of the muon beam, using time-of-flight detectors, Cherenkov detectors and 0920-5632/$ – see front matter © 2012 Elsevier B.V. All rights reserved. doi:10.1016/j.nuclphysbps.2012.09.168
KL (KLOE Light) calorimeter that provide precise particle identification. Step I is complete, and data analysis takes place. Step II is aimed at calibrating and validating the performance of the spectrometers. Step III is aimed at the reconstruction of beam emittance from single-particle measurements and verification of systematic errors in the measurements. Two spectrometers of identical design, one upstream and one downstream of the cooling section, measure the muon beam parameters. The incoming and outgoing 6D emittance is measured by determining x, x , y, y and particle momentum with a .35 mm precision fiber tracker with five 3D stations, and measuring t using time-of-flight detectors. Measurements with samples of solid material between the spectrometers are planned. Step IV will include a pair of focus coils and an absorber and will allow the change in emittance of the beam passing through a liquid hydrogen absorber to be measured. Using a solid wedge-shaped absorber in Step IV will allow demonstration of emittance exchange concept. Steps V and VI will contain one and two accelerating sections respectively, and will be used to demonstrate the reduction of the beam size (cooling) for a wide range of conditions. With Step V begins the test of cooling systems involving re-acceleration after cooling by energy loss. At Step VI a full cell of the NF cooling channel will be tested. References [1] MICE Status Reports, MICE Collaboration notes 230, 267, 288.
Nuclear Physics B (Proc. Suppl.) 229–232 (2012) 531 www.elsevier.com/locate/npbps
MICE: Its Program of Ionization Cooling Measurements in the Subsequent Steps Pavel Snopok, for the MICE Collaboration Department of Physics and Astronomy, University of California, Riverside, CA 92521
Abstract The Muon Ionization Cooling Experiment collaboration is constructing a complete unit cell of a muon ionization cooling channel. The set of cooling experiments to be performed and the progress on the construction are described. Keywords: MICE, Muon Ionization Cooling Experiment, ionizaion cooling, Neutrino Factory, muon beam
Figure 1: MICE implementation schedule
Neutrino Factory (NF) will produce the most intense and focused neutrino beam ever achieved by the decay of stored muons. Using this neutrino beam, the parameters of neutrino oscillations and CP-violation for leptons can be precisely measured. The transverse phase space of the initial muon beam needs to be reduced (cooled). The only cooling technique fast enough to cool within the muon lifetime is the ionization cooling. The objectives of the Muon Ionization Cooling Experiment[1] (MICE) are to design, engineer and fabricate a section of the cooling channel capable of giving the desired performance for a NF; to test it in a muon beam; to measure a 10% reduction in emittance of the beam with a precision of 1%; and to develop simulation and data analysis software. MICE is being implemented in Steps (Fig. 1). Step I measures the particle content of the muon beam, using time-of-flight detectors, Cherenkov detectors and 0920-5632/$ – see front matter © 2012 Elsevier B.V. All rights reserved. doi:10.1016/j.nuclphysbps.2012.09.168
KL (KLOE Light) calorimeter that provide precise particle identification. Step I is complete, and data analysis takes place. Step II is aimed at calibrating and validating the performance of the spectrometers. Step III is aimed at the reconstruction of beam emittance from single-particle measurements and verification of systematic errors in the measurements. Two spectrometers of identical design, one upstream and one downstream of the cooling section, measure the muon beam parameters. The incoming and outgoing 6D emittance is measured by determining x, x , y, y and particle momentum with a .35 mm precision fiber tracker with five 3D stations, and measuring t using time-of-flight detectors. Measurements with samples of solid material between the spectrometers are planned. Step IV will include a pair of focus coils and an absorber and will allow the change in emittance of the beam passing through a liquid hydrogen absorber to be measured. Using a solid wedge-shaped absorber in Step IV will allow demonstration of emittance exchange concept. Steps V and VI will contain one and two accelerating sections respectively, and will be used to demonstrate the reduction of the beam size (cooling) for a wide range of conditions. With Step V begins the test of cooling systems involving re-acceleration after cooling by energy loss. At Step VI a full cell of the NF cooling channel will be tested. References [1] MICE Status Reports, MICE Collaboration notes 230, 267, 288.