Keyword: plasma
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MOOB02 Emittance and Energy Spread Measurements of Relativistic Electrons From Laser-Driven Accelerator electron, emittance, laser, brightness 9
 
  • G.G. Manahan, M.P. Anania, C. Aniculaesei, E. Brunetti, S. Cipiccia, B. Ersfeld, M.R. Islam, R.C. Issac, D.A. Jaroszynski, R.P. Shanks, G.H. Welsh, S.M. Wiggins
    USTRAT/SUPA, Glasgow, United Kingdom
  
  Funding: Funding supported by U.K. EPSRC and the Scottish Universities Physics Alliance.
In this paper, we present a single-shot transverse emittance measurement for 125 ± 3 MeV electron beam using pepper-pot technique. A normalised transverse emittance as low as 1.1 ± 0.1 π-mm-mrad was measured using this method. Considering 60 consecutive shots, an average normalised emittance of εrms,x,y=2.2 ± 0.7, 2.3 ± 0.6 π-mm-mrad was obtained, which is comparable to a conventional linear accelerator. We also obtained high energy monoenergetic electron beam with relative energy spread less than 1%. The measured transverse emittance characterises the quality of an electron beam generated from laser-driven accelerator. Brightness, parallelism and focusability are all functions of the emittance. The low emittance and energy spread indicates that this type of accelerator is suitable for compact free electron laser driver. 		 
slides icon Slides MOOB02 [7.052 MB]  
 
MOPD93 Investigation of Diagnostic Techniques on a Nonneutral Plasma electron, space-charge, ion, diagnostics 266
 
  • K. Schulte, M. Droba, O. Meusel, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  
  Funding: Work supported by HIC for FAIR, BMBF No. 06FY90891.
Space charge lenses use a confined electron cloud for the focusing of ion beams. The focusing strength is given by the electron density whereas the density distribution influences the mapping quality of the space charge lens and is related to the confinement. The plasma parameters, loss as well as production mechanisms have a strong impact on plasma beam interactions. A scaled up space charge lens was constructed to investigate the properties of a nonneutral plasmas in detail. New non-interceptive diagnostic has been developed to characterize the collective behaviour of the confined nonneutral plasma in terms of an optimized lens design and parameters. Experimental results will be presented in comparison with numerical simulations. 		 
poster icon Poster MOPD93 [3.587 MB]  
 
TUPD93 Diagnostics of RF Breakdowns in High-Gradient Accelerating Structures collider, electron, vacuum, linear-collider 527
 
  • A. Palaia
    Uppsala University, Uppsala, Sweden
  • V.A. Dolgashev, J.R. Lewandowski, S.P. Weathersby
    SLAC, Menlo Park, California, USA
  
  Within the framework of the research on high-gradient accelerating structures for future linear colliders, diagnostics of radio-frequency (RF) breakdowns is of great importance to support the understanding of the vacuum breakdown process. Measurements of RF and electron and ion currents emitted during and after a breakdown can be used to calculate the properties of any objects responsible for such power reflection and charge emission. Possible breakdown models, breakdown localization and a time-scale of the process are here discussed and compared to dedicated measurements. First results are presented.  
poster icon Poster TUPD93 [7.029 MB]