Author: Pinkerton, S.F.
Paper Title Page
MOP106 Electron Acceleration via Positron Driven Plasma Wakefield Accelerator 295
 
  • S.F. Pinkerton, P. Muggli
    USC, Los Angeles, California, USA
  • W. An, W.B. Mori
    UCLA, Los Angeles, California, USA
 
  Funding: Work supported by US DoE and NSF.
We show that a positron bunch with parameters accessible at FACET can excite a stable plasma wakefield over a few meters and a witness electron bunch experiences an accelerating gradient on the order of 10 GeV/m. Initial simulations show that the positron drive bunch is strongly affected by the transverse components of the wakefield: the positron bunch evolves significantly, which affects both the wakefield and witness bunch dynamics. Various solutions are presented, of which the positron-electron train shceme generates a desirable wakefield.
 
 
TUOBN4 Plasma Wakefield Experiments at FACET 715
 
  • M.J. Hogan, R.J. England, J.T. Frederico, C. Hast, S.Z. Li, M.D. Litos, D.R. Walz
    SLAC, Menlo Park, California, USA
  • W. An, C.E. Clayton, C. Joshi, W. Lu, K.A. Marsh, W.B. Mori, S. Tochitsky
    UCLA, Los Angeles, California, USA
  • P. Muggli, S.F. Pinkerton, Y. Shi
    USC, Los Angeles, California, USA
 
  Funding: Work supported by the U.S. Department of Energy under contract number DE-AC02-76SF00515.
FACET, the Facility for Advanced Accelerator and Experimental Tests, is a new facility being constructed in sector 20 of the SLAC linac primarily to study beam driven plasma wakefield acceleration beginning in summer 2011. The nominal FACET parameters are 23GeV, 3nC electron bunches compressed to ~20μm long and focused to ~10μm wide. The intense fields of the FACET bunches will be used to field ionize neutral lithium or cesium vapor produced in a heat pipe oven. Previous experiments at SLAC demonstrated 50GeV/m gradients in an 85cm field ionized lithium plasma where the interaction distance was limited by head erosion. Simulations indicate the lower ionization potential of cesium will decrease the rate of head erosion and increase single stage performance. The initial experimental program will compare the performance of lithium and cesium plasma sources with single and double bunches. Later experiments will investigate improved performance with a pre-ionized cesium plasma. The status of the experiments and expected performance are reviewed.
 
slides icon Slides TUOBN4 [13.080 MB]