Author: Neuffer, D.V.
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MOPF01
 Final Cooling for a High Energy High Luminosity Collider  
 
  • D.V. Neuffer
    Fermilab, Batavia, Illinois, USA
  • T.L. Hart, D.J. Summers
    UMiss, University, Mississippi, USA
  
  The final cooling system for a high-energy high-luminosity muon collider requires reduction of the transverse emittance by an order of magnitude to ~0.00003 m (rms, N), while allowing longitudinal emittance increase to ~0.1m. In an initial approach, this is obtained by transverse cooling of low-energy muons within a sequence of high field solenoids with low-frequency rf systems. Since the final cooling steps are actually emittance exchange, much of this transformation can be obtained by thick wedge absorbers at matched parameters. Other variations using quad-based cooling channels, transverse beam slicing and round to flat transforms can be used. in x-y, with transverse slicing and longitudinal recombination are discussed. Development of lowest emittance cooling with final exchange is discussed.  
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MOPF07 Final Muon Ionization Cooling Channel using Quadrupole Doublets for Strong Focusing 43
 
  • J.G. Acosta, L.M. Cremaldi, T.L. Hart, S.J. Oliveros, D.J. Summers
    UMiss, University, Mississippi, USA
  • D.V. Neuffer
    Fermilab, Batavia, Illinois, USA
  
  Considerable progress has been made in the design of muon ionization cooling for a collider. A 6D normalized emittance of 0.123 cubic mm has been achieved in simulation, almost a factor of a million in cooling. However, the 6D emittance required by a high luminosity muon collider is 0.044 cubic mm. We explore a final cooling channel composed of quadrupole doublets limited to 14 Tesla. Flat beams formed by a skew quadrupole triplet are used. The low beta regions, as low as 5 mm, produced by the strong focusing quadrupoles are occupied by dense, low Z absorbers that cool the beam. Work is in progress to keep muons with different path lengths in phase with the RF located between cells and to modestly enlarge quadrupole admittance. Calculations and individual cell simulations indicate that the final cooling needed may be possible. Full simulations are in progress. After cooling, emittance exchange in vacuum reduces the transverse emittance to 25 microns and lets the longitudinal emittance grow to 70 mm as needed by a collider. Septa slices a bunch into 17 parts. RF deflector cavities, as used in CLIC tests, form a 3.7 meter long bunch train. Snap bunch coalescence combines the 17 bunches into one in a 21 GeV ring in 55 microseconds.  
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TUPF06
 The Status of MICE Step IV  
 
  • D.V. Neuffer
    Fermilab, Batavia, Illinois, USA
  • V.C. Palladino
    INFN-Napoli, Napoli, Italy
  
  Muon beams of low emittance provide the basis for the intense, well-characterised neutrino beams of the Neutrino Factory and for lepton-antilepton collisions at energies of up to several TeV at the Muon Collider. The international Muon Ionization Cooling Experiment (MICE) will demonstrate ionization cooling ' the technique by which it is proposed to reduce the μ-beam phase-space volume. MICE is being constructed in a series of steps. At Step IV, MICE will study the properties of liquid hydrogen and lithium hydride that affect cooling. A solenoidal spectrometer will measure emittance up and downstream of the absorber vessel, where a focusing coil will focus muons. The construction of Step IV at RAL is nearing completion. The status of the project will be described together with a summary of the performance of the principal components. Plans for the commissioning and operation and the Step IV measurement programme will be described.  
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THYAUD02 Front End and HFOFO Snake for a Muon Facility 150
 
  • D.V. Neuffer, Y.I. Alexahin
    Fermilab, Batavia, Illinois, USA
  
  Funding: Work supported by Contract No. De-AC02-07CH11359 with the U. S. Department of Energy
A neutrino factory or muon collider requires the capture and cooling of a large number of muons. Scenarios for capture, bunching, phase-energy rotation and initial cooling of muonss produced from a proton source target have been developed for neutrino factory and Muon Collider designs. The baseline scenarios requires a drift section from the target, a bunching section and a phase-energy rotation section leading into the cooling channel. The currently preferred cooling channel design is an 'HFOFO Snake' configuration that cools both μ+ and μ- transversely and longitudinally. The status of the design is presented and variations are discussed. 		 
slides icon Slides THYAUD02 [4.191 MB]  
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