Author: McDonald, K.T.
Paper Title Page
TUPFI069 Influence of Proton Beam Emittances on Particle Production off a Muon Collider Target 1511
 
  • X.P. Ding, D.B. Cline
    UCLA, Los Angeles, California, USA
  • J.S. Berg, H.G. Kirk, H. K. Sayed
    BNL, Upton, Long Island, New York, USA
  • V.B. Graves
    ORNL, Oak Ridge, Tennessee, USA
  • K.T. McDonald
    PU, Princeton, New Jersey, USA
  • N. Souchlas, R.J. Weggel
    Particle Beam Lasers, Inc., Northridge, California, USA
 
  Funding: Work supported in part by US DOE Contract NO. DE-AC02-98CHI10886.
A free-mercury-jet or a free-gallium-jet is considered for the pion-production target at a Muon Collider or Neutrino Factory. Based on a simple Gaussian incident proton beams with an infinitely large Courant-Snyder β parameters, we have previously optimized the geometric parameters of the target to maximize particle production initiated by incoming protons with kinetic energies (KE) between 2 and 16 GeV by using the MARS15 code. In this paper, we extend our optimization to focused proton beams with various transverse emittances. For the special cases of proton beams with emittances of 2.5, 5 or 10 μm-rad and a kinetic energy of 8 GeV, we optimized the geometric parameters of the target: the radius of the proton beam, the radius of the liquid jet, the crossing angle between the jet and the proton beam, and the incoming proton beam angle. We also study the influence of a shift of the beam focal point relative to the intersection point of the beam and the jet.
 
 
TUPFI073 Design of Magnets for the Target and Decay Region of a Muon Collider/Neutrino Factory Target 1514
 
  • R.J. Weggel, N. Souchlas
    Particle Beam Lasers, Inc., Northridge, California, USA
  • X.P. Ding
    UCLA, Los Angeles, California, USA
  • V.B. Graves
    ORNL, Oak Ridge, Tennessee, USA
  • H.G. Kirk, H. K. Sayed
    BNL, Upton, Long Island, New York, USA
  • K.T. McDonald
    PU, Princeton, New Jersey, USA
 
  The target and decay region of a Muon Collider/Neutrino Factory transports pions and muons in a superconducting solenoid channel that must be protected from radiation damage secondary particles produced by the 4-MW proton beam. For this, He-gas-cooled tungsten beads will be arrayed inside the magnet coils, which leads to large coil radii and high stored magnetic energy (~3 GJ). The design of the superconducting coils, and the tungsten shielding for the ~ 50-m-long target and decay region is reviewed.  
 
TUPFI074 Design of the Final Focus of the Proton Beam for a Neutrino Factory 1517
 
  • J. Pasternak, M. Aslaninejad
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • K. E. Gollwitzer
    Fermilab, Batavia, USA
  • H.G. Kirk
    BNL, Upton, Long Island, New York, USA
  • K.T. McDonald
    PU, Princeton, New Jersey, USA
 
  The ~ 8-GeV, 4-MW proton beam that drives a Neutrino Factory has a nominal 50-Hz macropulse structure with 2-3 micropulses ~ 100 ns apart. The nominal geometric beam emittance is 5 micron, and the desired rms beam radius at the liquid-metal-jet target is 1.2 mm. A quadrupole-triplet focusing system to deliver this beam spot is described.  
 
TUPFI075 Optimizing Muon Capture and Transport for a Neutrino Factory/Muon Collider Front End 1520
 
  • H. K. Sayed, J.S. Berg, H.G. Kirk
    BNL, Upton, Long Island, New York, USA
  • X.P. Ding
    UCLA, Los Angeles, California, USA
  • K.T. McDonald
    PU, Princeton, New Jersey, USA
 
  In the baseline scheme of the Neutrino Factory/Muon Collider a muon beam from pion decay is produced by bombarding a liquid-mercury-jet target with a 4-MW pulsed proton beam. The target is embedded in a high-field solenoid magnet that is followed by a lower field Decay Channel. The adiabatic variation in solenoid field strength along the beam near the target performs an emittance exchange that affects the performance of the downstream Buncher, Phase Rotator, and Cooling Channel. An optimization was performed using MARS1510 and ICOOL codes in which the initial and final solenoid fields strengths, as well as the rate of change of the field along the beam, were varied to maximize the number of muons delivered to the Cooling Channel that fall within the acceptance cuts of the subsequent muon-acceleration systems.  
 
THPFI092 Design of the Mercury Handling System for a Muon Collider/Neutrino Factory Target 3505
 
  • K.T. McDonald
    PU, Princeton, New Jersey, USA
  • J.S. Berg, H.G. Kirk, H. K. Sayed
    BNL, Upton, Long Island, New York, USA
  • X.P. Ding
    UCLA, Los Angeles, California, USA
  • V.B. Graves
    ORNL, Oak Ridge, Tennessee, USA
  • N. Souchlas, R.J. Weggel
    Particle Beam Lasers, Inc., Northridge, California, USA
 
  The baseline target concept for a Muon Collider or Neutrino Factory is a free mercury jet within a 20-T magnetic field being impacted by an 8-GeV proton beam. A pool of mercury serves as a receiving reservoir for the mercury and a dump for the unexpended proton beam. Modifications to this baseline are discussed in which the field at the target is reduced from 20 to 15 T, and in which the magnetic field drops from its peak value down to 1.5 T over 7 rather than 15 m.