MICE : the Muon Ionization Cooling Experiment M. Yoshida (Osaka Univ.) for the MICE Collaboration Osaka - Overview and Status -

Contents Motivation & goals Motivation & goals MICE introduction MICE introduction Cooling channel R&D Cooling channel R&D Particle detector R&D Particle detector R&D Schedule & Summary Schedule & Summary

MICE collaboration Europe Louvain la Neuve, Saclay, Bari, LNF Frascati, Genova, Legnaro, Milano, Napoli, Padova, Roma III, Trieste, NIKHEF, Novosibirsk, CERN, Gen è ve, ETH Zurich, PSI, Brunel, Edinburgh, Glasgow, Imperial College, Liverpool, Oxford, RAL, Sheffield Japan KEK, Osaka University United States of America ANL, BNL, FNAL, IIT, Chicago Enrico Fermi Inst., LBNL, UCLA, NIU, Mississippi, Riverside International collaboration of 37 institute

Neutrino Factory concept Muon Cooling Section: To reduce  +/  - phase space to capture as many muons as possible in an accelerator NF concept in Europe

Muon ionization cooling Principle reduce p t and p l increase p l heating Practice Advantage: fast in principle (muon life ~ 2  s) available for both of  + and  - So far, ionization cooling has not been demonstrated.  MICE check ability to construct cooling channel investigate the limit and practicality of the cooling

MICE history Instigation NuFact ’ 01 Instigation NuFact ’ 01 Letter of Intent submitted to RAL in 2002 Letter of Intent submitted to RAL in 2002 Proposal submitted to RAL on Jan. 10, 2003 Proposal submitted to RAL on Jan. 10, 2003 Approval “ strongly recommended ” by the International Review Panel on May 20, 2003 Approval “ strongly recommended ” by the International Review Panel on May 20, 2003 Scientific approval from CCLRC chief executive on Oct. 24, 2003 Scientific approval from CCLRC chief executive on Oct. 24, st UK Project Review (Gateway) 1 st UK Project Review (Gateway) Funding Negotiations – in progress in US, EU & JP Funding Negotiations – in progress in US, EU & JP 2 nd UK Project Review end 2004! 2 nd UK Project Review end 2004!

MICE goals (1)  Build a section of cooling channel long enough to provide measurable cooling (10% reduction of transverse emittance)  Liquid hydrogen absorber for large dE/dx  High gradient RF cavity for fast cooling ~10% Curves for 23 MV, 3 full absorbersnominal input emittance

MICE goals (2)  Achieve 1% accuracy in the measurement of 10% emittance reduction  Measure absolute emittance with 0.1% precision by tracking single particle before and after cooling channel  Particle ID to reject background pions and electrons  Need careful integration of particle detectors to the cooling channel  Low material to avoid scattering in the detectors  Robust operation in the magnetic field and background from RF

MICE apparatus: Beam & HALL – layout and progress this year MICE Muon Beam Line: MICE Muon Beam Line: Shielding to be re-installed Shielding to be re-installed Prepare beam line for installation in next long ISIS shutdown – early (?) 2006 Prepare beam line for installation in next long ISIS shutdown – early (?) 2006

MICE setup

MICE cooling channel Absorber with large X 0 to avoid heating Absorber with large X 0 to avoid heating SC solenoid focusing for small  t SC solenoid focusing for small  t High gradient reacceleration High gradient reacceleration 10% reduction of muon emittance for 200 MeV muons requires ~20MV RF 10% reduction of muon emittance for 200 MeV muons requires ~20MV RF  integrate these elements in the most compact and economic way 3 Liquid Hydrogen absorbers 8 cavities 201MHz RFs, 8MV/m 5T SC solenoids

Absorber R&D (MUCOOL) Convection-type absorber cooled by liquid He flow was tested in MTA/FNAL Convection-type absorber cooled by liquid He flow was tested in MTA/FNAL KEK absorber IIKEK test cryostat sitting in MTA/FNAL  See S.Ishimoto ’ s talk

Cooling channel R&D LH 2 window (IIT, NIU, ICAR) The challenge: Thin windows + safety regulations MUCOOL 201 MHz RF module (Berkeley, Los Alamos, JLAB, CERN, RAL) First cavity has been assembled Be window to minimize thickness

Beam diagnostic: components Particle identification Particle identification Upstream:  –  separation Upstream:  –  separation Time-of-flight measurement Time-of-flight measurement Cherenkov Cherenkov Downstream:  – e separation Downstream:  – e separation Cherenkov Cherenkov Electromagnetic calorimeter Electromagnetic calorimeter Spectrometers: Spectrometers: Position, momentum, emittance measurement Position, momentum, emittance measurement

Diagnostic: setup Proton Absorber Diffuser2 Beam PId scintillators ISIS proton beam TOF1 TOF0 TOF2 Cherenkov I Cherenkov 2MUCAL spectrometer

Upstream PID Cherenkov Cherenkov Tasks:  /  separation Tasks:  /  separation TOF hodoscopes TOF hodoscopes Resolution: 70ps resolution Resolution: 70ps resolution Tasks: Tasks: TOF0 – TOF1:  /  separation TOF0 – TOF1:  /  separation TOFs: measurement of muon phase w.r.t. RF TOFs: measurement of muon phase w.r.t. RF Trigger and trigger time Trigger and trigger time   /  separation at better than 1% at 300 MeV/c

Downstream PID Cherenkov Cherenkov Aerogel Cherenkov (n=1.02, blind to  s) Aerogel Cherenkov (n=1.02, blind to  s) Challenge: Operation in fringe field of detector solenoid Challenge: Operation in fringe field of detector solenoid E.M. Calorimeter E.M. Calorimeter 0.3mm lead + 1mm scintillating fiber 0.3mm lead + 1mm scintillating fiber TOF hodoscope TOF hodoscope  electron rejection at to avoid bias on emittance reduction measurement Aerogel

Spectrometer Requirement Absolute errors in emittance measurement should be <0.1% Absolute errors in emittance measurement should be <0.1% Robustness against harsh environment Robustness against harsh environment X-ray BG from RF cavities X-ray BG from RF cavities Intense magnetic fields Intense magnetic fields Solenoid: 4T magnetic field 40cm bore

MICE tracker Alternative option: TPC with GEM readout (TPG) Light gas (0.15% X0) Many points per track  High precision tracking possible Need to avoid RF noise on GEM Baseline option: Scintillating fiber tracker 5 planes x 3-fold doublet of 350  m fiber (0.35% X 0 ) VLPC readout; high QE  No active electronics/HV close to the spectrometer  Safe for LH  Robust in RF BG

SciFi tracker prototype at D0/FNAL test stand The prototype with 3 stations was constructed at the D0 test stand in Oct in collaboration with JP, UK, and US Prototype sitting at D0 test stand 4m long waveguide VLPC cryostat

Tracker prototype performance A typical cosmic ray event Point resolution ~440  m Light yield ~10p.e. at most probable   >99% Planning test beam at KEK: Additional station production – finalise fabrication techniques Additional station production – finalise fabrication techniques Tracking in SC solenoid - verify pattern recognition and momentum measurement in magnetic field Tracking in SC solenoid - verify pattern recognition and momentum measurement in magnetic field

TPG R&D Test of TPG head using HARP TPC field cage Test of TPG head using HARP TPC field cage Operation with cosmic-rays & with test beam is on- going Operation with cosmic-rays & with test beam is on- going

 - STEP I STEP II STEP III STEP IV STEP V STEP VI MICE installation phases ……………

Summary Detailed & Careful Design of cooling channel has been done Detailed & Careful Design of cooling channel has been done Progress on absorber R&D & RF cavity Progress on absorber R&D & RF cavity Tracker R&D Tracker R&D Baseline option : SciFi Baseline option : SciFi Prototype tests with cosmics was done Prototype tests with cosmics was done Preparing KEK beam test in 2005 with solenoid field Preparing KEK beam test in 2005 with solenoid field Detailed design of PID system has been done Detailed design of PID system has been done Start preparatory work at RAL Start preparatory work at RAL