Presentation on theme: "Emittance measurement: ID muons with time-of-flight Measure x,y and t at TOF0, TOF1 Use momentum-dependent transfer matrices iteratively to determine trace."— Presentation transcript:
Emittance measurement: ID muons with time-of-flight Measure x,y and t at TOF0, TOF1 Use momentum-dependent transfer matrices iteratively to determine trace space at TOF0 & TOF1. - measured p z & transfer matrix M(p z ) An extensive experimental program is planned for 2015, 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 The MICE Experiment Alain Blondel, DPNC, University of Geneva, on behalf of the MICE Collaboration The MICE Method MICE Ionization Cooling is the only practical solution to preparing ultra-high intensity muon beams for a neutrino factory or muon collider. The muon ionization cooling experiment (MICE) is under development at the Rutherford Appleton Laboratory (UK). STEP I The muon beam-line has been commissioned, and beams have been shown by direct measurement with the particle physics detectors to be adequate for cooling measurements, in rate, particle composition and emittance. STEP IV Measurements of beam cooling properties of liquid-hydrogen, lithium hydride and other absorbers are planned for 2014-2016. STEP VI A full cell of the ionization cooling channel, including RF re-acceleration, is under construction, aimed at operation by 2017-2019. The design offers opportunities for tests with various absorbers and optics configurations. Results will be compared with detailed simulations of cooling channel performance for a full understanding of the cooling process. Summary A schematic of the Step I MICE beam line A schematic of MICE: the cooling channel & upstream and downstream detectors Step IV: 2014-15 Fully engineered MICE Cooling Channel Cell Well… some ‘details’ left! Step VI: 2017-19 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 2014, 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 2018. 2. Reconstructed momentum p z for simulation (red), reconstructed simulation (blue) and data (black) MICE beam optics ( n,p z ) Step I: Completed & Published Everything works well! Muon rate ~120 in 2ms spill @ 0.4Hz TOF resolutions: t = 55, 53, and 50 ps and x,y ~1 cm First measurement of emittance made using TOFs. All Step IV components nearing completion. By 2014, this engineering drawing will be replaced with a photograph! Muon Storage Rings Step I: Beam Measurements 1. Time-of-Flight (6,200) muon beam (P~0.6 D1) 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 discovery of a light Higgs (126 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 )] = 10 -3 Muon cooling high intensity factory, high luminosity collider 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 emittance Took data for each -p optics setting in MICE Time-of-flight (TOF) for 300 MeV/c beam (D2=D1) 5. Transverse trace space for (6 mm, 200 MeV/c) - beam. Non-linear effects at edges Spectrometer Solenoid 2 Tracker 2 Challenges: high gradient (>8MV/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 Berkeley LH2 System RAL Focus Coil UK UK, US Tracker 1 Completed: Inner view shown Diffuser UK TOF system allows excellent , , e separation up to 300 MeV/c CKOV for PID at momenta >250 MeV/c KL (calorimeter) used to measure and e contamination in beams M. Rayner, U Genève DATA MC Preliminary EMR: UGeneve Training complete Spectrometer Solenoid 1 US: Berkeley, DOE 3. Pion fraction in beam ~< 1% from KL Coupling Coil – China-US Cold and superconducting!