Author: Johnson, R.P.
Paper Title Page
WEXB01 Breaking the 70 MeV Proton Energy Threshold in Laser Proton Acceleration and Guiding Beams to Applications 1886
 
  • M. Roth, S. Bedacht, S. Busold, O. Deppert, G. Schaumann, A. Tebartz, F. Wagner
    TU Darmstadt, Darmstadt, Germany
  • V. Bagnoud, A. Blazevic, D. Schumacher
    GSI, Darmstadt, Germany
  • C. Brabetz
    IAP, Frankfurt am Main, Germany
  • T.E. Cowan
    HZDR, Dresden, Germany
  • K. Falk, A. Favalli, J.C. Fernandez, C. Gautier, C.E. Hamilton, R.P. Johnson, K. Schoenberg, T. Shimada, G.A. Wurden
    LANL, Los Alamos, New Mexico, USA
  • M. Geißel, M. Schollmeier
    Sandia National Laboratories, Albuquerque, New Mexico, USA
  • D. Jung
    Queen's University of Belfast, Belfast, Northern Ireland, United Kingdom
  • F. Kroll
    Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Radiation Physics, Dresden, Germany
 
  This talk covers recent developments in laser plasma ion acceleration describing the technological challenges in breaking of energy threshold of 70 MeV. The presentation also highlights the recent experimental achievements towards laser ion acceleration and transport in the LIGHT collaboration.  
slides icon Slides WEXB01 [15.155 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEXB01  
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TUPME016 Status of the Complete Muon Cooling Channel Design and Simulations 1379
 
  • C.Y. Yoshikawa, C.M. Ankenbrandt, R.P. Johnson, S.A. Kahn, F. Marhauser
    Muons, Inc, Illinois, USA
  • Y.I. Alexahin, D.V. Neuffer, K. Yonehara
    Fermilab, Batavia, Illinois, USA
  • Y.S. Derbenev, V.S. Morozov, A.V. Sy
    JLab, Newport News, Virginia, USA
 
  Funding: Work supported in part by DOE STTR grant DE-SC 0007634.
Muon colliders could provide the most sensitive measurement of the Higgs mass and return the US back to the Energy Frontier. Central to the capabilities of such muon colliders are the cooling channels that provide the extraordinary reduction in emittance required for the precise Higgs mass measurement and increased luminosity for enhanced discovery potential of an Energy Frontier Machine. We present the status of the design and simulation of a complete muon cooling channel that is based on the Helical Cooling Channel (HCC), which operates via continuous emittance exchange to enable the most efficient design.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME016  
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TUPME017 Design and Simulation of a Matching System into the Helical Cooling Channel 1382
 
  • C.Y. Yoshikawa
    MuPlus, Inc., Newport News, Virginia, USA
  • Y.I. Alexahin, D.V. Neuffer, K. Yonehara
    Fermilab, Batavia, Illinois, USA
  • C.M. Ankenbrandt, R.P. Johnson, S.A. Kahn, F. Marhauser
    Muons, Inc, Illinois, USA
  • Y.S. Derbenev, V.S. Morozov, A.V. Sy
    JLab, Newport News, Virginia, USA
 
  Funding: Work supported in part by DOE STTR grant DE-SC 0007634.
Muon colliders could provide the most sensitive measurement of the Higgs mass and return the US back to the Energy Frontier. Central to the capabilities of muon colliders are the cooling channels that provide the extraordinary reduction in emittance required for the precise Higgs mass measurement and increased luminosity for enhanced discovery potential of an Energy Frontier Machine. The Helical Cooling Channel (HCC) is able to achieve such emittance reduction and matching sections within the HCC have been successfully designed in the past with lossless transmission and no emittance growth. However, matching into the HCC from a straight solenoid poses a challenge, since a large emittance beam must cross transition. We elucidate on the challenge and present evaluations of two solutions, along with concepts to integrate the operations of a Charge Separator and match into the HCC.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME017  
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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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THPRI064 Plasma Chemistry in a High Pressure Gas Filled RF Test Cell for use in a Muon Cooling Channel 3917
 
  • B.T. Freemire, Y. Torun
    IIT, Chicago, Illinois, USA
  • M. Chung, M.R. Jana, M.A. Leonova, A. Moretti, T.A. Schwarz, A.V. Tollestrup, Y. Torun, K. Yonehara
    Fermilab, Batavia, Illinois, USA
  • R.P. Johnson
    Muons, Inc, Illinois, USA
 
  Filling an RF cavity with a high pressure gas prevents breakdown when the cavity is placed in a multi-Tesla external magnetic field. A beam of particles traversing the cavity, be it muons or protons, ionizes the gas, creating an electron-ion plasma which absorbs energy from the cavity. In order to understand the nature of this plasma loading, a variety of gas species, gas pressures, dopants, and cavity electric fields were investigated. Plasma induced energy loss, electron-ion recombination rates, ion-ion recombination rates, and electron attachment times were measured. The results for hydrogen, deuterium, helium, and nitrogen, doped with dry air will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI064  
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