1. Particle Production in the MICE Beam Line Particle Accelerator Conference, May 2009, Vancouver, Canada Particle Production in the MICE Beam Line Jean-Sebastien Graulich, University of Geneva MICE Beam Line and Instrumentation Experimental Method Proton and Pion Content The R&D Effort Towards Neutrino Factory The Muon Ionization Cooling Experiment ISIS MICE Hall R5.2 What is a Neutrino Factory A neutrino factory is based on high energy muon storage ring. It provides high energy electron- and muon-neutrinos in equal quantities. Ideal for the study of the “Golden” oscillation channel: e  , e   and e  , e   Neutrino Factory physics Associated with the proper neutrino detector (several thousand km away) a Neutrino Factory would offer a unique opportunity to study neutrino mass hierarchy, leptonic CP violation and neutrino mixing unitarity. Prerequisite Cooling (or emittance reduction) of a tertiary muon beam prior to acceleration. Major uncertainty on the cost and feasibility. It is made difficult by the short lifetime (2.2  s) of the muon. Electron and Muon Content Simulations References Conclusion We have measured relative proton and pion rates in the MICE beam line at ~321MeV/c, 374 and 414 MeV/c. As expected, proton production drops drastically when decreasing momentum and has all but disappeared at ~321 MeV/c. With this particular layout of detectors, a good setting was established at ~321 MeV/c for producing a pure positive pion beam for further studies. TOF1 & cage Tracker Solenoid 1 Tracker 1 Photon Muon Electron Focus coil RF H2 absorber a full implementation of MICE with GEANT4 (G4MICE) (below an example) allows simulation and reconstruction of all steps of MICE. There is also a simpler ICOOL implementation of MICE for optimization The beam line also has a G4beamline description and Turtle for optimizations The experiment is located at STFC Rutherford Appleton Lab (UK) 1)Turn downstream Quadrupoles OFF 2)Start with 480 MeV/c proton momentum at B1. 3)Tune Q1, Q2 and Q3 maximize rate in GVA2 4)Scan dipole magnet B2 at various proton momentums : 414 MeV/c, 374 MeV/c, 322 MeV/c, and measure Pion and Proton rates The Time of flight technique is used to identify particles Starting from a 300 MeV/c pion beam, we reduced gradually the field until the momentum selected corresponds to 100 MeV/c. At this momentum only positrons can travel through the beam line. Starting from a 300 MeV/c pion beam, we reduced gradually the field until the momentum selected corresponds to 100 MeV/c. At this momentum only positrons can travel through the beam line. Starting from a 300 MeV/c pion beam, we reduced gradually the field until the momentum selected corresponds to 100 MeV/c. At this momentum only positrons can travel through the beam line. Aerogel Cherenkov Counters upstream pion/muon/electron separation 2 containers of aerogel radiator with different indices of refraction (n = 1.07, 1.12) ~5 p.e. in each PMT for beta=1 Time of Flight Stations Hodoscopes using fast scintillator bars, read by PMTs at both ends, arranged in 2 planes (X and Y for better performances) MICE is set up to build a section of ionization cooling, place it in a muon beam and test it in a variety of beam and optics configurations. An affordable section of cooling providing 10% reduction of transverse emittance is placed in a muon beam of 140 - 240 MeV/c. By measuring the particles one by one the emittance can be determined before and after the cooling channel with a precision of one part per mil.