Author: Hogan, M.J.
Paper Title Page
TUYB201
 Advances in Beam-driven-plasma Accelerators  
 
  • M.J. Hogan
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported in part by the U.S. Department of Energy under contract number DE-AC02-76SF00515.
High-cur­rent high-en­ergy par­ti­cle beams can be gen­er­ated at high rep­e­ti­tion rates with good elec­tri­cal ef­fi­ciency mak­ing them well suited as dri­vers for wake­field ac­cel­er­a­tors. High-gra­di­ent wake­field ac­cel­er­a­tors op­er­at­ing with multi-GeV/m fields use di­electrics and plas­mas as en­ergy trans­form­ers to con­vert these high-cur­rent low-en­ergy beams to rel­a­tively low-cur­rent high-en­ergy beams in a short dis­tance with high elec­tri­cal ef­fi­ciency. Fur­ther, the high-fre­quen­cies and com­pact di­men­sions of these ac­cel­er­a­tors nat­u­rally re­sult in high-bright­ness beams with po­ten­tial ap­pli­ca­tions in fu­ture light sources and col­lid­ers. The lat­est re­sults in beam-dri­ven di­elec­tric and plasma ac­cel­er­a­tion will be re­viewed, with par­tic­u­lar em­pha­sis on re­cent re­sults from the FACET fa­cil­ity at SLAC. Prospects for fu­ture de­vel­op­ments, in­clud­ing pro­ton dri­ven plasma wake­field ac­cel­er­a­tions ex­per­i­ments at CERN will also be dis­cussed. 		 
slides icon Slides TUYB201 [23.602 MB]  
 
TUPEA045 Self-Modulation and Hosing Instability of Slac Electron and Positron Bunches in Plasmas 1235
 
  • J. Vieira, N.C. Lopes
    Instituto Superior Tecnico, Lisbon, Portugal
  • E. Adli, S.J. Gessner, M.J. Hogan, S.Z. Li, M.D. Litos
    SLAC, Menlo Park, California, USA
  • Y. Fang
    USC, Los Angeles, California, USA
  • C. Joshi, K.A. Marsh, W.B. Mori, N. Vafaei-Najafabadi
    UCLA, Los Angeles, California, USA
  • P. Muggli
    MPI, Muenchen, Germany
  • O. Reimann
    MPI-P, München, Germany
  • L.O. Silva
    IPFN, Lisbon, Portugal
  
  Funding: This work has been partially supported by Humboldt Foundation.
The un­der­stand­ing of the self-mod­u­la­tion (SMI) and hos­ing (HI) in­sta­bil­i­ties is crit­i­cal for the suc­cess of the up­com­ing pro­ton dri­ven plasma wake­field ac­cel­er­a­tion ex­per­i­ments at CERN*. The use of long SLAC elec­tron and positron bunches pro­vides the pos­si­bil­ity of un­der­stand­ing ex­per­i­men­tally the in­ter­play be­tween SMI and HI. In this work we per­form par­ti­cle-in-cell sim­u­la­tions with the code OSIRIS with pa­ra­me­ters that will be avail­able for ex­per­i­ments at SLAC in 2013. We show that the SMI of 20 GeV lep­ton bunches can grow and sat­u­rate in less than 15 cm. Up to 8 GeV en­ergy gain/loss could be ob­served after a meter long plasma. The HI can also be ef­fec­tively mit­i­gated by seed­ing the SMI using bunches with short rise times**. We also show an­a­lyt­i­cally and nu­mer­i­cally that in the lin­ear regime and after sat­u­ra­tion of the SMI the HI can be sup­pressed by a plasma-BNS damp­ing ana­logue. Sev­eral di­ag­nos­tics that could be used in ex­per­i­ments to mea­sure the SMI de­vel­op­ment and these ef­fects are also ex­plored.
*G. Xia et al., J. Plasma Phys., 1-7 (2012).
**J. Vieira et al., Phys. Plasmas 19, 063105 (2012). 		 
 
TUPME020 Design of a TeV Beam Driven Plasma-wakefield Linear Collider 1613
 
  • E. Adli
    University of Oslo, Oslo, Norway
  • W. An, C. Joshi, W.B. Mori
    UCLA, Los Angeles, California, USA
  • J.-P. Delahaye, S.J. Gessner, M.J. Hogan, T.O. Raubenheimer
    SLAC, Menlo Park, California, USA
  • P. Muggli
    MPI, Muenchen, Germany
  
  Funding: This work is supported by the Research Council of Norway and U.S. Department of Energy under contract number DE-AC02-76SF00515.
A novel de­sign of a 500 GeV c.m. beam-dri­ven PWFA lin­ear col­lider with ef­fec­tive ac­cel­er­at­ing gra­di­ent on the order of 1 GV/m and ex­tend­able in the multi-TeV en­ergy range is pre­sented. The main bunches col­lide in CW mode at sev­eral kHz rep­e­ti­tion fre­quency. They are ac­cel­er­ated and fo­cused with sev­eral GV/m fields gen­er­ated in plasma cells by drive bunches with very good trans­fer ef­fi­ciency. The drive bunches are them­selves ac­cel­er­ated by a CW su­per­con­duct­ing rf re­cir­cu­lat­ing linac. We con­sider the over­all op­ti­miza­tions for the pro­posed de­sign, com­pare the ef­fi­ciency with sim­i­lar col­lider de­signs like ILC and CLIC and we out­line the major R&D chal­lenges. 		 
 
TUPWA069 Longitudinal Phase Space Dynamics with Novel Diagnostic Techniques at FACET 1865
 
  • S.J. Gessner, E. Adli, F.-J. Decker, M.J. Hogan, T.O. Raubenheimer
    SLAC, Menlo Park, California, USA
  • A. Scheinker
    LANL, Los Alamos, New Mexico, USA
  
  Funding: Work supported [optional: in part] by the U.S. Department of Energy under contract number DE-AC02-76SF00515.
FACET pro­duces high en­ergy den­sity elec­tron beams for Plasma Wake­field Ac­cel­er­a­tion (PWFA) ex­per­i­ments. The high en­ergy den­sity beams are cre­ated by chirp­ing the elec­tron beam with ac­cel­er­at­ing sec­tions and com­press­ing the beam in mag­netic chi­canes. Pre­cise con­trol of the lon­gi­tu­di­nal beam pro­file is needed for the drive-wit­ness bunch PWFA ex­per­i­ments cur­rently un­der­way at FACET. We dis­cuss the sim­u­la­tions, con­trols, and di­ag­nos­tics used to achieve FACET's unique lon­gi­tu­di­nal phase space.