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SUMMARY:Plasma wakefield acceleration driven by charged particle bunches a
 nd the AWAKE experiment at CERN
DTSTART:20150608T103000
DTEND:20150608T113000
DTSTAMP:20260406T142515Z
UID:9ad44114e3d0449c1423ad429965c46e4cc4f5285462a736026630fe
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. P. Muggli\, Group Leader – Future Accelerators Group\,
  Max-Planck-Inst. für Physik\, Münich\, D\nThe AWAKE[1] experiment aims 
 at exploring the use of proton bunches as drivers for plasma wakefields. P
 roton bunches are interesting because they carry large amounts of energy (
 10-100kJ) so that they can drive wakefields over long distances and lead t
 o very large energy gain by externally injected particles [2]. Proton bunc
 hes from the CERN super proton synchrotron (SPS) with 400GeV/particle are 
 long (~12cm or 400ps rms). In order to drive ~GV/m the bunch needs to be ~
 1mm long\, the wavelength λpe of the relativistic plasma wake in a plasma
  with electron density in the (1-10)x1014cm-3 range. However\, long bunche
 s propagating in dense plasmas are subject to the self-modulation instabil
 ity (SMI). The SMI modulates the bunch density at ~λpe. The long and modu
 lated bunch then resonantly drives wakefields to large amplitude.\nIn the 
 AWAKE experiment a short laser pulse abruptly creating the plasma within t
 he proton bunch seeds the SMI. We are developing various diagnostics based
  on incoherent optical transition radiation (OTR) and its coherent variati
 on CTR to measure the characteristics (period\, etc) of the proton bunch m
 odulation resulting from the SMI occurrence. The first phase of the experi
 ment will be devoted to the study of the SMI. After this first phase\, sch
 eduled to start at the end of 2016\, a long electron bunch from an externa
 l source will be injected to sample the accelerating fields. An energy gai
 n on the order of 1GeV over the 10-m-long plasma length is expected. Later
  experiment will study accelerator physics issues\, such as injection of a
  short electron bunch (possibly from another plasma-based accelerator)\, b
 eam loading and large energy gains. Long terms projects include developmen
 t of very long plasma sources\, generation of single\, short proton bunche
 s and application of the scheme to high-energy physics.\nI will give an in
 troduction to charged particle beam driven\, plasma wakefield acceleration
  and show latest experimental results. I will describe the AWAKE experimen
 t at CERN\, the first and only one using proton bunches to drive wakefield
 s in plasma.\n1.  Proton-driven plasma wakefield acceleration: a path to 
 the future of high-energy particle physics \, AWAKE Collaboration\, Plasma
  Phys. Control. Fusion 56 084013 (2014).\n2.  Proton-driven plasma-wakefi
 eld acceleration\, A. Caldwell et al.\, Nature Physics 5\, 363 (2009).
LOCATION:PPB 019
STATUS:CONFIRMED
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