Results from Step I of MICE Outline The Muon Ionisation Cooling Experiment Results from Step I of MICE Summary

Results from Step I of MICE Outline The Muon Ionisation Cooling Experiment Results from Step I of MICE Summary www.phwiki.com

Results from Step I of MICE Outline The Muon Ionisation Cooling Experiment Results from Step I of MICE Summary

Ryan, Bill, Fishing Columnist has reference to this Academic Journal, PHwiki organized this Journal Results from Step I of MICE D Adey 2013 International Workshop on Neutrino Factories, Super-beams in addition to Beta-beams Working Group 3 – Accelerator Topics Institute of High Energy Physics Beijing 21st August 2013 Outline Ionisation Cooling MICE The detectors used in Step I The method as long as reconstructing MICE beam parameters The results Muon beams are big (up to 20 mm·rad at a Neutrino Factory) Reducing the transverse emittance of the beam to 2-5 mm·rad can mean a significant difference in flux between a Neutrino Factory in addition to less involved muon storage rings Longitudinal emittance reduction will be essential as long as a muon collider Existing methods of emittance reduction are too slow as long as the short lifetime of the muon Need something new

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Isotropic energy loss achieved in an absorber Multiple scattering unavoidable, so material must be chosen with care, optimising dE/dx (cooling) against multiple scattering (heating) Longitudinal momentum replaced with RF cavities Net loss in transverse momentum spread in addition to total 4D emittance Cooling per as long as mance (scaled to LH2) The Muon Ionisation Cooling Experiment Single particle measurement using precision spectrometers Calculate emittance from particle ensemble Pass through absorber in addition to RF modules Solenoidal lattice as long as focussing into absorber in addition to coupling in Rf cavities

Based at the Ruther as long as d Appleton Laboratory near Ox as long as d, UK Utilises the proton synchrotron of the ISIS neutron spallation source Staged planning with addition of liquid hydrogen absorbers in addition to RF cavities Step I – Beamline comissioning (complete) Step IV –Tracking detectors in addition to single absorber focus coil module Step V –2 AFC in addition to RF modules (sustainable cooling) Step VI –3 AFC in addition to 2 RF modules (one cooling cell) Based at the Ruther as long as d Appleton Laboratory near Ox as long as d, UK Utilises the proton synchrotron of the ISIS neutron spallation source Staged planning with addition of liquid hydrogen absorbers in addition to RF cavities Step I Step IV Step V Step VI Steps II in addition to III removed due to changes in completion time of components 140 – 240 MeV/c momentum range. 3-10 mm·rad transverse emittance inflated by diffuser mechanism Measure 10% reduction in emittance to within 1% – 0.1% measurement of emittance Achieved with single particle measurements in precision spectrometer Step I aim – prepare in addition to characterise muon beam up to the diffuser

Scintillating Time of Flight counters 4-6cm segmentation with X-Y views covering the beam profile Low timing resolution Position resolution improved by timing difference between PMTs TOF0: 55ps TOF1: 53ps e Selected as long as ward decays Selected backward decays Selected as long as ward decays TOF counters placed either side of Quadrupole triplet Time of Flight coupled with momentum selection from dipoles allows as long as PID between electrons, muons on pions Results from Step I of MICE

Measurement planes Position measurements at two planes in addition to knowledge of the transfer matrices between points provides the angle x’ Elements are momentum dependent MICE has a large longitudinal momentum spread A modified technique is required Estimate Pz from time of flight between TOF planes Calculate transfer matrix element based on this Pz estimate in addition to OPERA model of quadrupole fields Estimate path direction in addition to use residual to update path length ds in addition to Pz Repeat until convergence Correction of 1.5MeV/c included to account as long as material interactions TOF0 – First measurement plane TOF1 – Second measurement plane Q798 – Quadrupole triplet x0, y0 x1, y1 Position measurements obtained by functions of Pz x1 = A(Pz)x0 + B(Pz) Strong Pz dependence below 200MeV/c leads to large scale deviations between single particle transfer matrices – no single matrix as long as a MICE beam

Monte Carlo simulation shows Pz resolution is dominated by TOF resolution Using the reconstruction method, true x’ in addition to x’ reconstructed (from MC) are compared x in addition to y MC approximately 9.8 in addition to 11.4 mm respectively Simulation allows as long as characterisation of reconstruction per as long as mance in addition to correction to real data emittance calculations due to reconstruction resolution Simulation Simulation Rec Data Data MC comparison as long as positions measurements Comparison of Pz between data (black) MC (red) in addition to reconstructed MC (blue)

Reconstruction method generates trace space values from which ellipses can be defined (chi squared = 6 shown) Covariance matrix of trace space values provides optical functions Correction was applied to account as long as reconstruction resolution 140MeV/c 200MeV/c 240MeV/c Step I results Data taken as long as MICE beamline operating modes (inflation to 3-10 mmrad is post-diffuser) Beam momenta take loss in diffuser into account

140MeV/c 200MeV/c 240MeV/c Step I results Data taken as long as MICE beamline operating modes (inflation to 3-10 mmrad is post-diffuser) Beam momenta take loss in diffuser into account Summary MICE Step I beamline commissioned in addition to characterised Reconstruction technique using Time of Flight counters enabled measurement of trace space parameters in addition to Twiss functions of MICE muon beam Analysis paper accepted by European Physics Journal C Preparations in addition to planning as long as Step IV ongoing – see next talk by D. Kaplan Thanks to the rest of the MICE collaboration, in particular V. Blackmore Backup

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Trackers Scintillating fibre trackers (~0.5mm resolution) placed within 4T solenoids Direct precision measurements of phase space values

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