Author: Gessner, S.J.
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TUYC1
 Multi-GeV Electron and Positron Plasma Wakefield Acceleration Results at FACET  
 
  • S.J. Gessner, E. Adli, J.M. Allen, C.I. Clarke, J.-P. Delahaye, J.T. Frederico, S.Z. Green, M.J. Hogan, N. Lipkowitz, M.D. Litos, M.P. Schmeltz, D.R. Walz, V. Yakimenko, G. Yocky
    SLAC, Menlo Park, California, USA
  • E. Adli
    University of Oslo, Oslo, Norway
  • W. An, C.E. Clayton, C. Joshi, K.A. Marsh, W.B. Mori, N. Vafaei-Najafabadi
    UCLA, Los Angeles, California, USA
  • M. Downer, R. Zgadzaj
    The University of Texas at Austin, Austin, Texas, USA
  • W. Lu
    TUB, Beijing, People's Republic of China
  • P. Muggli
    MPI, Muenchen, Germany
  
  Funding: This work performed [in part] under DOE Contract DE-AC02-76SF00515.
The FACET accelerator test facility at SLAC hosts a new generation of Plasma Wakefield Acceleration (PWFA) experiments. "Two-bunch" experiments have demonstrated high-gradient, highly efficient energy transfer in a plasma wakefield. I will discuss results of follow-up experiments that use a 1.3 meter long plasma to accelerate witness bunch electrons to even higher energies. In a first, we observed multi-GeV acceleration of positrons in a plasma. This is a critical step in demonstrating the applicability of PWFA for High-Energy Physics applications. 		 
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WEPWA008 Measuring the Self-modulation Instability of Electron and Positron Bunches in Plasmas 2506
 
  • P. Muggli, O. Reimann
    MPI-P, München, Germany
  • E. Adli, V.K.B. Olsen
    University of Oslo, Oslo, Norway
  • J. Allen, S.J. Gessner, S.Z. Green, M.J. Hogan, M.D. Litos, B.D. O'Shea, V. Yakimenko
    SLAC, Menlo Park, California, USA
  • L.D. Amorim
    IST, Lisboa, Portugal
  • G. Andonian, C. Joshi, K.A. Marsh, W.B. Mori, N. Vafaei-Najafabadi, O. Williams
    UCLA, Los Angeles, California, USA
  • N.C. Lopes, L.O. Silva, J. Vieira
    Instituto Superior Tecnico, Lisbon, Portugal
  
  The self-modulation instability (SMI) * can be used to transform a long, charged particle bunch into a train of periodically spaced shorter bunches. The SMI occurs in a plasma when the plasma wake period is much shorter than the bunch length. The train of short bunches can then resonantly drive wakefields to much larger amplitude that the long bunch can. The SMI will be used in the AWAKE experiment at CERN, where the wakefields will be driven by a high-energy (400GeV) proton bunch. ** However, most of the SMI physics can be tested with the electron and positron bunches available at SLAC-FACET. *** In this case, the bunch is ~10 plasma wavelengths long, but can drive wakefields in the GV/m range. FACET has a meter-long plasma **** and is well equipped in terms of diagnostic for SMI detection: optical transition radiation for transverse bunch profile measurements, coherent transition radiation interferometry for radial modulation period measurements and energy spectrometer for energy loss and gain measurement of the drive bunch particles. The latest experimental results will be presented.
* N. Kumar et al., PRL 104, 255003 (2010)
** AWAKE Collaboration, PPCF 56 084013 (2014)
*** J. Vieira et al., PoP 19, 063105 (2012)
**** S.Z. Green et al., PPCF 56, 084011 (2014)
 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA008  
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