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Status and New Results from MICE

Status and New Results from MICE. MICE Oversight Committee Open Session RAL, 21 June 2010 Paul Soler (on behalf of the MICE Collaboration). Contents. MICE aims Ionization Cooling at a Neutrino Factory Description of MICE ISIS MICE Beamline MICE Target MICE Luminosity Monitor

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Status and New Results from MICE

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  1. Status and New Results from MICE MICE Oversight Committee Open Session RAL, 21 June 2010 Paul Soler (on behalf of the MICE Collaboration)

  2. Contents MICE aims Ionization Cooling at a Neutrino Factory Description of MICE ISIS MICE Beamline MICE Target MICE Luminosity Monitor MICE Detectors (CKOV, TOF, Tracker, KL, EMR) Steps II-VI (Absorber, Focus Coil, RF, Coupling Coil) MICE Commissioning and Step I Physics Conclusions P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  3. MICE aims • The Muon Ionization Cooling Experiment (MICE) is being built at the Rutherford Appleton Laboratory (RAL) to measure ionization cooling from a beam of muons traversing liquid hydrogen and other low Z absorbers (LiH). • The aim of MICE is to measure ~10% cooling for 140-240 MeV/c muons with a measurement precision of De/ein=10-3 P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  4. MICE Collaboration • International Muon Ionization Cooling Experiment (MICE): Belgium, Bulgaria, China, Holland, Italy, Japan, Switzerland, UK, USA based at Rutherford Appleton Laboratory (UK): ~150 collaborators P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  5. Neutrino Factory • Neutrino Factory baseline from International Design Study • Essential component: Muon Ionization Cooling stage P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  6. Principle Ionization Cooling Needed to achieve 1021m/yr Practice ~ 20% cost of neutrino factory P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  7. Ionization Cooling • Ionization cooling: • Ionization gives cooling term, multiple scattering gives a heating term • Ionization per density is proportional to Z, multiple scattering is inversely proportional to X0 thus prop to Z(Z+1) • Thus, the best cooling is achieved with a low Z absorber: e.g. liquid hydrogen, lithium hydride (LiH) P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  8. x’ y’ x y Ionization Cooling • However, the cooling performance is measured by the reduction in the emittance of the beam through the cooling channel • Definition of emittance: • Vij is covariance matrix of phase space: • Physical meaning emittance: proportional “area” of 4D phase space ellipse (x,x’px/pz, y,y’ py/pz) Need to perform single particle experiment to measure emittance with full correlations P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  9. MICE • Cooling demonstration aims to: • design, engineer, and build a section of cooling channel capable of giving the desired performance for a Neutrino Factory • place this apparatus in a muon beam and measure its performance in a variety of modes of operation and beam conditions • show that design tools (simulation codes) agree with experiment • MICE includes one cell of the FS2 cooling channel: • three Focus Coil modules with absorbers (LH2 or solid) • two RF-Coupling Coil modules (4 cavities per module) • Plus two Spectrometer Solenoids, particle ID and timing for emittance measurement P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  10. MICE Schedule • MICE is a staged experiment: P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  11. ISIS Synchrotron • The MICE muon beamline is extracted from the ISIS synchrotron at RAL • Protons injected with KE=70 MeV • Acceleration up to KE=800 MeV • Acceleration time = 10 ms • Machine frequency = 50 Hz. • Bunch rep. rate = 1.5x106 Hz • 10 dipole magnets (R=7 m) • Ring radius = 26 m • Peak acceleration by 6 RF cavities: 140 kV per turn MICE Beamline P. Soler, MICE OsC Meeting, RAL, 21 June 2010 Beam loss monitors

  12. MICE Beamline 1st Triplet 2nd Triplet 3rd Triplet P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  13. MICE Beamline 1st Triplet Extraction region with three quads 2nd Triplet 3rd Triplet P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  14. MICE Beamline 1st Triplet Pion decay region with solenoid and dipoles 2nd Triplet 3rd Triplet P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  15. MICE Beamline Muon matching section with two quad triplets, TOF0, TOF1 and Cherenkov 1st Triplet 2nd Triplet 3rd Triplet P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  16. MICE Beamline • All magnets in MICE beamline installed and operational • Diffuser: rotating wheel with different thicknesses of material to blow up beam for large emittance beams • To be ready Q4 2010 See Wing Lau talk tomorrow P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  17. MICE Beamline • Decay solenoid: • Installed Multi Layer Insulation (MLI) near coil 10 beginning 2009 • First successful cool down (Apr 09) • Operated 5T from Apr-Dec 2009 • Impurity problems with fridge: Jan-May 2010 • Diagnosis and tracing leak proved to be very difficult • Faulty seal found and repaired first week of May 2010 • Cool-down during May-June 2010 • Decay solenoid finally powered up to 400 A on 12 June 2010 P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  18. MICE Target • New redesigned target operational since September 2009 • Target: titanium rod 3mm (2.3mm) outer (inner) radius • Target insertion mechanism: • Linear motor with radial magnets P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  19. Distance from beam centre (mm) Target trajectory ~ 30 ms Edge of pipe Beam envelope 43 mm MICE Target • Target cycles at ~1 Hz • Target only dips into beam for one pulse every 50 ISIS pulses Intersection of target with beam during last millisecond of acceleration cycle (ie. 9-10 ms after injection) for protons with KE ~ 800 MeV Acceleration requirement: ~80g P. Soler, MICE OsC Meeting, RAL, 21 June 2010 Target installed at RAL

  20. MICE Target • Beam loss in ISIS and in sector 7 of ISIS used to determine “protons-on-target” Full monitoring of target performance from MICE control room Integrated ISIS beamloss Target position Target installed in ISIS has had 246k actuations (June 2010) ISIS spill Integrated sector 7 beamloss P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  21. MICE Luminosity Monitor • Luminosity monitor to determine particle rate close to target and extract protons on target as function of depth – independent of beam loss. Cuts off: protons ~500 MeV/c pions ~150 MeV/c Beam P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  22. MICE Luminosity Monitor • Luminosity monitor to determine particle rate close to target and extract protons on target as function of depth – independent of beam loss. Cuts off: protons ~500 MeV/c pions ~150 MeV/c Beam P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  23. MICE Luminosity Monitor • Position of luminosity monitor:10 m from target at 25o inside ISIS synchrotron vault. P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  24. MICE Luminosity Monitor • Preliminary results: 1955 particles per V.ms / 4 cm2 • Equivalent to 1.7x10-8 particles/(pot . cm2) P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  25. MICE Detector systems • Cherenkov detector: • Two aerogels with different refractive index, read out by 4 PMTs • Pion-muon separation • Time of Flight (TOF): PID and RF phase • Resolution: TOF0 st = 51 ps, TOF1 st = 62 ps TOF2 st = 50 ps • TOF0-TOF1: pion-muon separation • TOF1-TOF2: electron rejection TOF1: 62 ps TOF2: 52 ps TOF0: 51 ps P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  26. MICE Detector systems • Scintillating fibre tracker: • Two trackers in 4T solenoid, with 5 SciFi tracking stations in each tracker • Resolution:0.4 mm spatial, 1.1 MeV/c pt and 3.9 MeV/c pz Tracker solenoid cryostat P. Soler, MICE OsC Meeting, RAL, 21 June 2010 Magnet 2 winding of the Center Coil

  27. MICE Detector systems • Calibration scintillating fibre tracker with cosmics: • Hit efficiencies: 99.8% • Photoelectron yield: • Track residuals: 11.23 PE 682 mm P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  28. MICE Detector systems • Spectrometer solenoid: • Five coil superconducting magnet: 4T • Burned HTS leads caused quench in system • Repair of magnet: delay in delivery P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  29. MICE Detector systems • MICE Electron-Muon-Calorimeter: • Dedicated to electron-muon separation. • KLOE-Light (KL) lead-scintillating fibre calorimeter: 4 cm preshower grooved lead foils with scintillating fibers, (installed and tested at RAL) • Electron Muon ranger (EMR): 25 modules (150 cm) of triangular plastic extruded scintillators to measure energy and range • Installation September 2010 P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  30. MICE Absorbers and Focus Coil • Liquid hydrogen absorber with focus coil magnets: careful integration See Wing Lau and Matt Hills’ talks tomorrow Cryocooler Cryocooler for Magnet P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  31. SC coupling coil RFCC module • Four 201.25 MHz copper-niobium cavities per RFCC module β = 0.87, Q0 ~ 53,500 Be window radius: 21cm; thickness 0.38 mm Peak RF power ~ 4.6 MW per cavity Gradient: ~ 16 MV/m See Mike Zisman’s talk tomorrow P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  32. MICE Beam Commissioning • Particle identification performance • Good separation of p, m and electrons Particle ID with TOF/CKOV: p/m/e- P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  33. MICE Beam Commissioning • Particle rate vs ISIS beam loss P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  34. Step I Physics • Step I Physics programme includes measuring the parameters of the muon beam under the nine settings of the emittance-momentum matrix: 22 June-16 August: data taking 7 days per week to finish Step I programme before long shutdown P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  35. Step I Physics • First measurement of emittance at 6p mm rad and pm=200 MeV/c See Mark Rayner’s talk tomorrow P. Soler, MICE OsC Meeting, RAL, 21 June 2010

  36. Conclusions • MICE beam installed and functioning • MICE target in ISIS working very well: 246k actuations • Decay solenoid fridge developed leaks but has now been fixed and working well • All detector systems (except EMR) are operational • EMR to be installed during next long ISIS shutdown • Carrying out Step I physics programme • Particle rates vs beam loss • Emittance measurement using beamline detectors • Delay in spectrometer solenoid (see talks tomorrow) • Good progress preparing steps II-VI: • Steps II-IV should occur in 2011. • Steps V-VI expected 2012-13. P. Soler, MICE OsC Meeting, RAL, 21 June 2010

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