Author: Flanagan, G.
Paper Title Page
TUPRO116 Conceptual Design of the Muon Cooling Channel to Incorporate RF Cavities 1325
 
  • S.A. Kahn, G. Flanagan, F. Marhauser
    Muons, Inc, Illinois, USA
  • M.L. Lopes, K. Yonehara
    Fermilab, Batavia, Illinois, USA
 
  Funding: Work supported by U.S. DOE STTR/SBIR grant DE-SC00006266
A helical cooling channel (HCC) consisting of a pressurized gas absorber imbedded in a magnetic channel that provides solenoid, helical dipole and helical quadrupole fields has been shown to provide six-dimensional phase space reduction for muon beams. Such a channel can be implemented by a helical solenoid (HS) composed of short solenoid coils arranged in a helical pattern. The magnetic channel will provide the desired Bphi, Bz, and dBphi/dr along the reference path. The channel must allow enough space for RF cavities which replace energy lost in the absorber material present for the cooling process. The study will describe how to achieve the desired field while allowing sufficient space for the cavities. The limits to this design imposed by the achievable current density in the coils will be discussed.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO116  
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TUPME061 Ultra-High Gradient Beam-Driven Channeling Acceleration in Hollow Crystalline Media 1512
 
  • Y.-M. Shin, T. Xu
    Northern Illinois University, Dekalb, Illinois, USA
  • G. Flanagan
    Muons, Inc, Illinois, USA
  • E.R. Harms, J. Ruan, V.D. Shiltsev
    Fermilab, Batavia, Illinois, USA
 
  Since the recent discovery of the Higgs boson particle, there is an increasing demand in Energy Frontier to develop new technology for a TeV/m range of acceleration gradient. The density of charge carriers, ~ 1024 – 1029 m-3, of crystals is significantly higher than that of a plasma gas, and correspondingly in principle wakefield gradients of up to 0.1 - 10 TV/m are possible. Our simulations (VORPAL and CST-PIC) with Fermilab-ASTA* beam parameters showed that micro-bunched beam gains energy up to ~ 70 MeV along the 100 um long channel under the resonant coupling condition of the plasma wavelength, ~ 10 um. Also, with lowering a charge, electron bunches channeling through a high-density plasma medium have higher energy gain in a hollow channel than in a uniformly filled cylinder, which might be attribute to lower scattering ratios of the tunnel structure. The numerical analysis implied that synthetic crystalline plasma media (e.g. carbon nanotubes) have potential to mitigate constraint of bunch charges required for beam-driven acceleration in high density plasma media. The channeling acceleration** will be tested at the ASTA facility, once fully commissioned.
* ASTA: Advanced Superconducting Test Accelerator
** [1] T. Tajima and M. Cavenago, PRL 59, 13(1987)
[2] P. Chen and R. Noble, SLAC-PUB-7402(1998)
[3] V.Shiltsev, Physics Uspekhi 55, 965(2012)
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME061  
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WEPRI100 Magnetic Design Constraints of Helical Solenoids 2731
 
  • M.L. Lopes, S. Krave, J.C. Tompkins, K. Yonehara
    Fermilab, Batavia, Illinois, USA
  • G. Flanagan, S.A. Kahn
    Muons, Inc, Illinois, USA
  • K.E. Melconian
    Texas A&M University, College Station, Texas, USA
 
  Helical solenoids have been proposed as an option for a Helical Cooling Channel for muons in a proposed Muon Collider. Helical solenoids can provide the required three main field components: solenoidal, helical dipole, and a helical gradient. In general terms, the last two are a function of many geometric parameters: coil aperture, coil radial and longitudinal dimensions, helix period and orbit radius. In this paper, we present design studies of a Helical Solenoid, addressing the geometric tunability limits and auxiliary correction system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI100  
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THPME054 RF Cavity Design Aspects for a Helical Muon Beam Cooling Channel 3352
 
  • F. Marhauser, G. Flanagan, R.P. Johnson, S.A. Kahn
    Muons, Inc, Illinois, USA
  • K. Yonehara
    Fermilab, Batavia, Illinois, USA
 
  Funding: Work supported under U.S. DOE Grant Application Number DE-SC0006266
A Helical Cooling Channel (HCC) promises efficient six-dimensional ionization cooling of muon beams by utilizing high-pressurized gas as a continuous absorber within a magnetic channel embedding RF cavities. The progress on cavity design, tailored for such a cooling channel, is discussed.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME054  
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