Emittance measurement: ID muons with time-of-flight Measure x,y and t at TOF0, TOF1 Use momentum-dependent transfer matrices to map  path Assume straight.

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Emittance measurement: ID muons with time-of-flight Measure x,y and t at TOF0, TOF1 Use momentum-dependent transfer matrices to map  path Assume straight line path, estimate p z and iterate to calculate true p z Determine trace space at TOF0 & TOF1. - measured p z & transfer matrix M(p z ) An extensive experimental program is planned for 2013, including data taken with variations on the original Step IV configuration. No absorber: alignment & beam optics Liquid H2 absorber (full/empty) Multiple scattering, Energy Loss  COOLING Solid absorbers: LiH, Plastic, C, Al, Cu LiH wedge absorber: emittance exchange Status of MICE: the International Muon Ionization Cooling Experiment Neutrino2012 Linda R. Coney, UC Riverside for the MICE Collaboration Work supported by US-NSF-PHY The MICE Method Ionization Cooling is the only practical solution to preparing high brilliance muon beams for a neutrino factory or muon collider. The Muon Ionization Cooling Experiment (MICE) is under development at the Rutherford Appleton Laboratory (UK) by an international collaboration. The muon beam line has been commissioned and, for the first time, measurements of beam emittance with particle physics detectors have been performed. The remaining apparatus is currently under construction. First results with a liquid- hydrogen absorber will be produced in 2013; followed by the operation of a full representative ionization cooling channel cell which will include RF re-acceleration. The design offers opportunities to observe cooling with various absorbers and several optics configurations. Results will be compared with detailed simulations of cooling channel performance to ensure full understanding of the cooling process. Introduction A schematic of the Step I MICE beam line A schematic of MICE: the cooling channel & upstream and downstream detectors Step IV: 2013 Fully engineered MICE Cooling Channel Cell Step VI: Aim 2016 Major progress has been made recently in MICE with the successful commissioning of the beam line. First measurements of the   beam emittance have been made using the TOF detectors. Installation of all Step IV components will continue through 2012, followed by the first high precision (0.1%) emittance measurements made in MICE with the fiber trackers (470  m space point resolution ). Finally, world-wide effort continues on the construction of MICE Step VI with a goal of completion in Transverse beam profile at TOF1 MICE  beam optics (  n,p z ) Step I: Completed & Published Everything works well! Muon rate ~100/sec TOF resolutions:  t = 55, 53, and 50 ps and  x ~1 cm First measurement of emittance made using TOFs. All Step IV components nearing completion. By the end of 2012, this engineering drawing will be replaced with a photograph! R&D for Future Accelerators Step I: Beam Measurements 1. Time-of-Flight (6,200) beam: muons in blue MICE is a critical R&D experiment on the path toward neutrino factories and muon colliders. With the growing importance of neutrino physics and the possibility of a light Higgs ( GeV), physics could be moving this way soon!  (mm) p (MeV/c) Measure input particle x,x’,y,y’, t, t’=E/Pz  input emittance  in Measure output particle x,x’,y,y’, t, t’=E/Pz  output emittance  out COOLING CHANNEL Measure parameters particle by particle: accumulate ~10 5 muons   [(  in –  out /  in )] = In such machines, the initial chain of capture, bunching, phase rotation, and cooling rely on complex beam dynamics and technology. Muon cooling  high intensity factory, high luminosity  collider Neutrino Factory MICE recorded > 10 6 particle triggers with , e, and  beams to meet Step 1 goals: Calibrated detectors & understood beam Generated reproducible  beams Analysed beam composition,  rates, data quality, and . Took data for each  -p optics setting in MICE Time-of-flight (TOF) for 300 MeV/c  beam 3.4  path from TOF0 to TOF1: drifts & quads 5. Transverse trace space for (6 mm, 200 MeV/c)  - beam. Non-linear effects at edges Spectrometer Solenoid 2 Tracker 2 EMR: UGeneve Challenges: high gradient (>12MV/m) RF cavities embedded in strong (>2T) solenoidal magnetic fields. RFCC Module Absorber Spectrometer Solenoid & Tracker RF Cavities Berkeley RF Couplers - Berkeley RF Amplifier: Daresbury Be Windows Absorber Windows Mississippi Coupling Coil – Harbin China Berkeley LH2 System RAL Focus Coil UK UK, US Tracker 1 Completed: Inner view shown Spectrometer Solenoid 1 US: Berkeley, DOE Diffuser UK TOF system allows excellent , , e separation up to 300 MeV/c CKOV studies show good separation of particles  identification at low momenta KL (calorimeter) used to measure  contamination in  beams M. Rayner, U Genève DATA MC Preliminary Right: Pion fraction in  beam < 1-2% Preliminary