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MICE at STFC-RAL The International M uon I onization C ooling E xperiment

MICE at STFC-RAL The International M uon I onization C ooling E xperiment. -- Design, engineer and build a section of cooling channel capable of giving the desired performance for a Neutrino Factory;

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MICE at STFC-RAL The International M uon I onization C ooling E xperiment

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  1. MICE at STFC-RAL The International Muon Ionization Cooling Experiment -- Design, engineer and build a section of cooling channel capable of giving the desired performance for a Neutrino Factory; -- Place it in a muon beam and measure its performance in various modes of operation and beam conditions, thereby investigating the limits and practicality of cooling.

  2. MICE Neutrino Factory MICEis one of the critical R&D experiments towards neutrino factories and muon colliders With the growing importance of neutrino physics + the possibilityof a light Higgs (115-130 GeV) physicscouldbeturningthiswayveryfast! Cooling and more generally the initial chain capture, buncher, phase rotation and cooling rely on complexbeamdynamics and technology, such as High gradient (~>12 MV/m) RF cavitiesembedded in strong (>2T) solenoidalmagneticfield MANY CHALLENGES! MUON COOLING  HIGH INTENSITY NEUTRINO FACTORY HIGH LUMINOSITY MUON COLLIDER

  3. COOLING -- Principleisstraightforward… Longitudinal: Transverse: Similar to radiation damping in an electronstorage ring: muon momentumisreduced in all directions by goingthroughliquidhydrogenabsorbers, and restoredlongitudinally by acceleration in RF cavities. Thus transverse emittance isreducedprogressively. Because of a) the production of muons by pion decay and b) the short muon lifetime, ionizationcoolingisonlypractical solution to producehighbrilliance muon beams Emittance exchange involvesionization varying in spacewhich cancels the dispersion of energies in the beam. This canbeused to reduce the energy spread and is of particularinterest for + -  H (125) since the Higgsisverynarrow (~5MeV) Practicalrealizationis not! MICE coolingchannel (4D cooling) 6D candidate coolinglattices

  4. MICE the Muon IonizationCoolingExperiment 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 Particleby particlemeasurement, thenaccumulate few 105 muons  [ (in- out)/in ]= 10-3

  5. MICE Collaboration across the planet Coupling Coils 1&2 Focus coils Spectrometer solenoid 2 Spectrometer solenoid 1 MICE isnowcompletelyengineered ! RF cavities RF power Beam PID TOF 0, TOF 1 Cherenkovs Downstream particle ID: TOF 2, KL EMR VariableDiffuser Liquid Hydrogen absorbers 1,2,3 Incoming muon beam Trackers 1 & 2

  6. MICE STEPS COMPLETED Both for funding and science reasons MICE isexecuted in Steps …. Originallywehad 6 Steps Wewillprobablyonly have 3 steps step I, step IV, step VI 2013 STEP VI Aim: 2016

  7. Completed and published! Main results: -- It all works! -- TOF resolution s: 50 ps and 1cm -- ~100 muons per second Beamcommissionning y (mm) vs x (mm) x (mrad) vs x (mm) y (mrad) vs y (mm) Data -- and first measts of emittance with the TOFs MC

  8. STEP IV SpectrometerSolenoid 1 FOCUS COIL SpectrometerSolenoid 2 diffuser Tracker 2 Tracker 1 EMR LH2 system Make this a photograph by the end of 2012!

  9. STEP IV EXPERIMENTS (2013) No absorber Alignment Opticsstudies Liq H2 absorber (full/empty) Multiple scattering Energyloss  Cooling Solid absorber(s) LiH Plastic C, Al, Cu LiHWedge absorber Emittance exchange

  10. STEP VI Berylium Windows (Berkeley) RF Amplifier (Daresbury) RF Couplers (Berkeley) MICE construction: world-wide team effort! Aim: MICE step VI in 2016 STEP VI Aim: 2016 Liq H2 absorber (KEK) Coupling coil (Harbin China) AFC Magnet (RAL/Oxford) absorber windows (Mississippi) RF cavities (Berkeley)

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