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Stolyarov, D.

Paper Title Page
WEPLS025 Multi-bunch Plasma Wakefield Experiments at the Brookhaven National Laboratory Accelerator Test Facility 0
 
  • P. Muggli, E.K. Kallos, T.C. Katsouleas
    USC, Los Angeles, California
  • M. Babzien, I. Ben-Zvi, K. Kusche, P.I. Pavlishin, I. Pogorelsky, D. Stolyarov, V. Yakimenko
    BNL, Upton, Long Island, New York
  • W.D. Kimura
    STI, Washington
  • F. Zhou
    UCLA, Los Angeles, California
 
  In the plasma wakefield accelerator (PWFA), a short particle bunch or train of bunches drives a large amplitude relativistic plasma wave or wake. The wake has both transverse, focusing fields, and longitudinal fields that can accelerate trailing particles or a trailing bunch. In this experiment conducted at BNL-ATF, a CO2 laser driven IFEL modulates the energy of the 65 MeV, 1.5 ps electron bunch, which after a drift creates a train of bunches approximately 3 fs long, separated by the laser wavelength (10.6 μm or about 30 fs). The largest wake amplitude is reached when the plasma wavelength is equal to the bunch spacing: n=1·1019 e-/cc. In this case, the bunch train drives a wake with an amplitude of approximately 7 GV/m in an ablative capillary discharge plasma. This wake amplitude is much larger than that previously observed with the un-bunched beam*. With this multi-bunch PWFA scheme, the energy of an appropriately phased trailing bunch could be multiplied by a large factor, of the order of the number of drive bunches. Experimental results including plasma density diagnostic using Stark broadening, beam bunching using CTR and energy gain and loss measurements will be presented.

*V. Yakimenko et al., Phys. Rev. Lett. 91, 014802 (2003).