MICE The International Muon Ionisation Cooling Experiment

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Presentation transcript:

MICE The International Muon Ionisation Cooling Experiment Chris Booth, Sheffield 3rd July 2008

University of Sheffield Outline Motivation: a Neutrino Factory Cooling Introduction to MICE Upstream beam-line Fibre tracker Cooling components Particle ID Schedule Chris Booth University of Sheffield

A Neutrino Factory design Reduction of muon phase space – muon cooling Chris Booth University of Sheffield

University of Sheffield Muon Cooling Principle Muons produced from decay have large phase space (emittance) Cannot efficiently inject into accelerator Must cool (reduce spread of angles and momenta) Short lifetime (=2s)  cannot use conventional (stochastic, electron) cooling Use ionisation cooling Chris Booth University of Sheffield

University of Sheffield Muon Cooling Cooling aim: >4 – 10 increase in muon flux beam in Cooling is delicate balance: Cooling Scattering beam out Chris Booth University of Sheffield

MICE – Muon Ionisation Cooling Experiment Aims Design, build, commission and operate a section of a real cooling channel Solve the engineering challenges Measure performance under a variety of beam conditions Test a variety of energy-absorbing media Liquid H2 LiH Carbon, … Produce data required for optimised design of Neutrino Factory cooling channel Chris Booth University of Sheffield

University of Sheffield Principles Generate a diffuse (uncorrelated) muon beam Produce pions at target Select collimated momentum bite After drift, select lower momentum muons (from  decay) Pass through “diffuser” (scatterer) Verify muons by particle id Measure muons’ position and momentum (vector) Pass through cooling channel (dE/dx & RF) Measure new position & momentum Verify particles are still undecayed muons Calculate change in emittance from selected “beam” Repeat for other momenta, energy absorbers, magnetic field configurations, etc. Chris Booth University of Sheffield

University of Sheffield MICE collaboration Chris Booth University of Sheffield

University of Sheffield Overview Chris Booth University of Sheffield

University of Sheffield Upstream Beam-line Parasitic target Decay solenoid ISIS Chris Booth University of Sheffield

University of Sheffield Target Mechanism Titanium target dips into accelerated proton beam. Dip rate ~1 Hz, on demand EM linear motor: acceleration ~850 ms2 to sample correct time. Installed January 2008. >190K pulses used for beam & detector commissioning. Reliability problems with parallel “demonstrator” system led to mechanical redesign. New target will be installed in August Chris Booth University of Sheffield

University of Sheffield Chris Booth University of Sheffield

University of Sheffield Upstream quad triplet and dipole Superconducting decay solenoid (5 m long, 5 T) – PSI Mechanical repairs completed Multi-layer insulation renewed Commissioned at full field successfully Chris Booth University of Sheffield

University of Sheffield Fibre Tracker 5 Scintillating fibre stations Double fibre layers (0.35mm diameter). Triplet of layers (120°) per station. VLPC readout. 8-10 photo-electrons per layer. ~0.6 mm resolution per plane (verified with cosmics). 4T superconducting solenoid. Chris Booth University of Sheffield

Liquid Hydrogen Absorbers Novel H2 system based on metal hydride beds Produce H2 when warmed, absorb it when cooled Technology developed for H2 automobile industry Intrinsically (relatively) safe. Cryo-coolers Compact, closed-circuit refrigeration units Superconducting magnets Low  environment Chris Booth University of Sheffield

University of Sheffield 201 MHz RF Cavities Large aperture for uncooled muon beam) High Q & high accelerating gradient Thin curved beryllium windows Minimise multiple scattering Double-curved shape prevents buckling caused by thermal expansion due to RF heating Tests underway at FNAL Operation in large magnetic fields Chris Booth University of Sheffield

University of Sheffield Cherenkov 2 modules give , , e separation Aerogel radiator sheets Low mass, reflecting funnels 8” photomultipliers Chris Booth University of Sheffield

Time of Flight/Trigger   e 2 stations upstream + 1 downstream 2.5 MHz rate (for 1 ms) at TOF0 Modular (1212) design Fast scintillator BC404 or 420 2.5 cm thick (compromise timing vs. scattering!) Fine-mesh PMTs (e.g. Hamamatsu R4996) + magnetic shielding + modified base TOF 0/1 commissioned in 2008 using 300 MeV/c + ~52 ps resolution achieved. //e separation. Chris Booth University of Sheffield

Electromagnetic calorimeter/ranger Kloe-like lead/scintillating fibre calorimeter followed by scintillator electron/muon-ranger (EMR). FRONT 1 mm scintillating fibres in 0.3 mm grooved lead foils. 44 cm2 blocks, pm at each end. Muons punch through as mips; electrons produce shower. BACK 49 layers of 59 triangular bars. WLS fibre light-guides 64-pixel PMT 72 cm Chris Booth University of Sheffield

Projected Measurement of Cooling Target: “Measure 10% cooling to 1%” - i.e. 0.1% absolute Chris Booth University of Sheffield

University of Sheffield Chris Booth University of Sheffield

University of Sheffield Conclusion MICE will make a detailed study of cooling under a wide variety of conditions. Construction is well underway. Beam characterisation started last year. Step 1 will start this summer; Step 2 in Autumn. Cooling measurements will occur (with increasingly sophisticated/realistic setups) over next three years. We should provide valuable input for design studies, to enable construction of a Neutrino Factory from the middle of the next decade. Chris Booth University of Sheffield