Author: An, W.
Paper Title Page
WEPZ023 Results from Plasma Wakefield Acceleration Experiments at FACET 2814
 
  • S.Z. Li, C.I. Clarke, R.J. England, J.T. Frederico, S.J. Gessner, M.J. Hogan, R.K. Jobe, M.D. Litos, D.R. Walz
    SLAC, Menlo Park, California, USA
  • E. Adli
    University of Oslo, Oslo, Norway
  • W. An, C.E. Clayton, C. Joshi, W. Lu, K.A. Marsh, W.B. Mori, S. Tochitsky
    UCLA, Los Angeles, California, USA
  • P. Muggli
    USC, Los Angeles, California, USA
 
  Funding: Work supported by the U.S. Department of Energy under contract number DE- AC02-76SF00515.
We re­port ini­tial re­sults of the Plas­ma Wake­field Ac­cel­er­a­tion (PWFA) Ex­per­i­ments per­formed at FACET - Fa­cil­i­ty for Ad­vanced aC­cel­er­tor Ex­per­i­men­tal Tests at SLAC Na­tion­al Ac­cel­er­a­tor Lab­o­ra­to­ry. At FACET a 23 GeV elec­tron beam with 1.8x1010 elec­trons is com­pressed to 20 mi­crons lon­gi­tu­di­nal­ly and fo­cused down to 10 mi­crons x 10 mi­crons trans­verse spot size for user driv­en ex­per­i­ments. Con­struc­tion of the FACET fa­cil­i­ty com­plet­ed in May 2011 with a first run of user as­sist­ed com­mis­sion­ing through­out the sum­mer. The first PWFA ex­per­i­ments will use sin­gle elec­tron bunch­es com­bined with a high den­si­ty lithi­um plas­ma to pro­duce ac­cel­er­at­ing gra­di­ents >10GeV/m bench­mark­ing the FACET beam and the newly in­stalled ex­per­i­men­tal hard­ware. Fu­ture plans for fur­ther study of plas­ma wake­field ac­cel­er­a­tion will be re­viewed.
 
 
WEPZ028 Status of Plasma Electron Hose Instability Studies in FACET 2826
 
  • E. Adli
    University of Oslo, Oslo, Norway
  • W. An, W.B. Mori
    UCLA, Los Angeles, California, USA
  • R.J. England, J.T. Frederico, M.J. Hogan, S.Z. Li, M.D. Litos, Y. Nosochkov
    SLAC, Menlo Park, California, USA
 
  Funding: This work is supported by the Research Council of Norway, the Fulbright Visiting Scholar Program and US DOE contract DE-AC02-76SF00515.
In the FACET plas­ma-wake­field ac­cel­er­a­tion ex­per­i­ments a dense 23 GeV elec­tron beam will in­ter­act with lithi­um and ce­sium plas­mas, lead­ing to plas­ma ion-chan­nel for­ma­tion. The in­ter­ac­tion be­tween the elec­tron beam and the plas­ma sheath-elec­trons may lead to a fast grow­ing elec­tron hose in­sta­bil­i­ty. By using op­tics dis­per­sion knobs to in­duce a con­trolled z-x tilt along the beam en­ter­ing the plas­ma, we in­ves­ti­gate the trans­verse be­hav­ior of the beam in the plas­ma as func­tion of the tilt. We seek to quan­ti­fy lim­its on the in­sta­bil­i­ty in order to fur­ther ex­plore po­ten­tial lim­i­ta­tions on fu­ture plas­ma wake­field ac­cel­er­a­tors due to the elec­tron hose in­sta­bil­i­ty.