Author: Cary, J.R.
Paper Title Page
THXBA5
 Electro-Optic Sampling Beam Position Monitor  
 
  • K.D. Hunt-Stone, R.A. Ariniello, J.R. Cary, C.E. Doss
    CIPS, Boulder, Colorado, USA
  • J.R. Cary
    Tech-X, Boulder, Colorado, USA
  • M.D. Litos
    Colorado University at Boulder, Boulder, Colorado, USA
  
  Funding: This work was supported in part by the U.S. D.O.E. grant number DE-SC0017906.
Electron beam-driven plasma wakefield accelerator (PWFA) experiments at SLAC’s FACET-II research facility will require diagnostics that can measure the transverse position of both the drive beam and the witness beam in a single shot. This is a challenge for ordinary beam position monitors due to the close temporal spacing between the two bunches, usually on the order of 300 fs. Here we will discuss the concept for an electro-optic sampling beam position monitor (EOS-BPM) that can measure the transverse position of the individual bunches with roughly 10 µm spatial resolution, and 50 fs temporal resolution. The EOS-BPM has the advantage of being a non-destructive, single shot measurement. It uses two EO crystals on either side of the beamline. The half-cycle THz fields of the electron beams induce a birefringence in the crystals which are probed by a chirped laser pulse. The longitudinal current profile is spectrally encoded into the probe laser, while the transverse position for each bunch is encoded in the relative strength of the signal in either crystal. We present simulations demonstrating the effectiveness of an EOS-BPM in the context of PWFA experiments planned for FACET-II. 		 
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MOOHC2 The US Electron Ion Collider Accelerator Designs 1
 
  • A. Seryi, S.V. Benson, S.A. Bogacz, P.D. Brindza, M.W. Bruker, A. Camsonne, E. Daly, P. Degtiarenko, Y.S. Derbenev, M. Diefenthaler, J. Dolbeck, R. Ent, R. Fair, D. Fazenbaker, Y. Furletova, B.R. Gamage, D. Gaskell, R.L. Geng, P. Ghoshal, J.M. Grames, J. Guo, F.E. Hannon, L. Harwood, S. Henderson, H. Huang, A. Hutton, K. Jordan, D.H. Kashy, A.J. Kimber, G.A. Krafft, R. Lassiter, R. Li, F. Lin, M.A. Mamun, F. Marhauser, R. McKeown, T.J. Michalski, V.S. Morozov, P. Nadel-Turonski, E.A. Nissen, G.-T. Park, H. Park, M. Poelker, T. Powers, R. Rajput-Ghoshal, R.A. Rimmer, Y. Roblin, D. Romanov, P. Rossi, T. Satogata, M.F. Spata, R. Suleiman, A.V. Sy, C. Tennant, H. Wang, S. Wang, C. Weiss, M. Wiseman, W. Wittmer, R. Yoshida, H. Zhang, S. Zhang, Y. Zhang, Z.W. Zhao
    JLab, Newport News, Virginia, USA
  • D.T. Abell, D.L. Bruhwiler, I.V. Pogorelov
    RadiaSoft LLC, Boulder, Colorado, USA
  • E.C. Aschenauer, G. Bassi, J. Beebe-Wang, J.S. Berg, M. Blaskiewicz, A. Blednykh, J.M. Brennan, S.J. Brooks, K.A. Brown, K.A. Drees, A.V. Fedotov, W. Fischer, D.M. Gassner, W. Guo, Y. Hao, A. Hershcovitch, H. Huang, W.A. Jackson, J. Kewisch, A. Kiselev, V. Litvinenko, C. Liu, H. Lovelace III, Y. Luo, F. Méot, M.G. Minty, C. Montag, R.B. Palmer, B. Parker, S. Peggs, V. Ptitsyn, V.H. Ranjbar, G. Robert-Demolaize, T. Roser, S. Seletskiy, V.V. Smaluk, K.S. Smith, S. Tepikian, P. Thieberger, D. Trbojevic, N. Tsoupas, E. Wang, W.-T. Weng, F.J. Willeke, H. Witte, Q. Wu, W. Xu, A. Zaltsman, W. Zhang
    BNL, Upton, New York, USA
  • D.P. Barber
    DESY, Hamburg, Germany
  • I.V. Bazarov
    Cornell University, Ithaca, New York, USA
  • G.I. Bell, J.R. Cary
    Tech-X, Boulder, Colorado, USA
  • Y. Cai, Y.M. Nosochkov, A. Novokhatski, G. Stupakov, M.K. Sullivan, C.-Y. Tsai
    SLAC, Menlo Park, California, USA
  • Z.A. Conway, M.P. Kelly, B. Mustapha, U. Wienands, A. Zholents
    ANL, Lemont, Illinois, USA
  • S.U. De Silva, J.R. Delayen, H. Huang, C. Hyde, S. Sosa, B. Terzić
    ODU, Norfolk, Virginia, USA
  • K.E. Deitrick, G.H. Hoffstaetter
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • D. Douglas
    Douglas Consulting, York, Virginia, USA
  • V.G. Dudnikov, R.P. Johnson
    Muons, Inc, Illinois, USA
  • B. Erdelyi, P. Piot
    Northern Illinois University, DeKalb, Illinois, USA
  • J.D. Fox
    Stanford University, Stanford, California, USA
  • J. Gerity, T.L. Mann, P.M. McIntyre, N. Pogue, A. Sattarov
    Texas A&M University, College Station, USA
  • E. Gianfelice-Wendt, S. Nagaitsev
    Fermilab, Batavia, Illinois, USA
  • Y. Hao, P.N. Ostroumov, A.S. Plastun, R.C. York
    FRIB, East Lansing, Michigan, USA
  • T. Mastoridis
    CalPoly, San Luis Obispo, California, USA
  • J.D. Maxwell, R. Milner, M. Musgrave
    MIT, Cambridge, Massachusetts, USA
  • J. Qiang, G.L. Sabbi
    LBNL, Berkeley, California, USA
  • D. Teytelman
    Dimtel, Redwood City, California, USA
  • R.C. York
    NSCL, East Lansing, Michigan, USA
  
  With the completion of the National Academies of Sciences Assessment of a US Electron-Ion Collider, the prospects for construction of such a facility have taken a step forward. This paper provides an overview of the two site-specific EIC designs: JLEIC (Jefferson Lab) and eRHIC (BNL) as well as brief overview of ongoing EIC R&D.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-MOOHC2  
About • paper received ※ 29 August 2019       paper accepted ※ 04 September 2019       issue date ※ 08 October 2019  
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THAHC6
 Particle-in-Cell Simulations of Plasma Production in C100 SRF Cavity for in Situ Cleaning  
 
  • J.B. Leddy, J.R. Cary, D.M. Cheatham, D.N. Smithe
    Tech-X, Boulder, Colorado, USA
  
  Particle-in-cell simulations provide insight into the parameters of the plasma that can be used to remove impurities from superconducting radio frequency (SRF) cavity walls in situ. Surface contamination of the vessel walls can severely impact the achievable field strength. Therefore, efficient and effective cleaning of the cavity surfaces is necessary to maintain optimal acceleration gradients. In situ cleaning techniques involve generating plasma discharges that remove the impurities through chemical and mechanical processes*. The benefits of these techniques are to reduce the field emission and increase stability for devices with complex geometries without the need for disassembly. Theoretical methods have emerged to increase the effectiveness of the plasma discharge cleaning; however, there is an inherent risk when attempting new methods experimentally. We have performed particle-in-cell simulations of the C100 cavity including ionization, recombination, and scattering interactions to explore the parameters of the plasma generated via EM signal. These properties provide an insight into the plasma generation and its predicted effectiveness at removing impurities.  
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