Author: Osterhoff, J.
Paper Title Page
WEPMY005 Upgrades of the Experimental Setup for Electron Beam Self-modulation Studies at PITZ 2548
  • M. Groß, J. Engel, G. Koss, O. Lishilin, G. Loisch, G. Pathak, S. Philipp, R. Schütze, F. Stephan
    DESY Zeuthen, Zeuthen, Germany
  • R. Brinkmann, J. Osterhoff
    DESY, Hamburg, Germany
  • F.J. Grüner
    CFEL, Hamburg, Germany
  • F.J. Grüner
    University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
  • D. Richter
    HZB, Berlin, Germany
  • C.B. Schroeder
    LBNL, Berkeley, California, USA
  The self-modulation instability is fundamental for the plasma wakefield acceleration experiment of the AWAKE collaboration at CERN where this effect is supposed to be used to generate proton bunches short enough for producing high acceleration fields. For ease of experimentation it was decided to set up a supporting experiment at the electron accelerator PITZ (Photo Injector Test facility at DESY, Zeuthen site), given that the underlying physics is the same. The goals are to demonstrate and investigate in detail the self-modulation of long electron beams. In 2015 a first set of experiments was conducted utilizing as key elements a novel cross-shaped lithium plasma cell and an ArF excimer laser for plasma generation. No self-modulation was observed yet because of various experimental shortcomings. The properties of the experimental setup were studied in detail and in this contribution we report about the upgrades which are projected to enable the observation of the self-modulation in the upcoming experimental run.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY005  
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WEPMY006 A High Transformer Ratio Scheme for PITZ PWFA Experiments 2551
  • G. Loisch, M. Groß, H. Huck, A. Oppelt, Y. Renier, F. Stephan
    DESY Zeuthen, Zeuthen, Germany
  • A. Aschikhin, A. Martinez de la Ossa, J. Osterhoff
    DESY, Hamburg, Germany
  • M. Hochberg, M. Sack
    KIT, Karlsruhe, Germany
  In the field of plasma wakefield acceleration (PWFA) significant progress has been made throughout the recent years. However, an important issue in building plasma based accelerators that provide particle bunches suitable for user applications will be a high transformer ratio, i.e. the ratio between maximum accelerating field in the witness and maximum decelerating fields in the driver bunch. The transformer ratio for symmetrical bunches in an overdense plasma is naturally limited to 2*. Theory and simulations show that this can be exceeded using asymmetrical bunches. Experimentally this was proven in RF-structures**, but not in PWFA. To study transformer ratios above this limit in the linear regime of a plasma wake, an experimental scheme tailored to the unique capabilities of the Photoinjector Test Facility Zeuthen PITZ, a 20-MeV electron accelerator at DESY, is being investigated. This includes analytical plasma wakefield calculations, numerical simulations of beam transport and plasma wakefields, as well as preparatory studies on the photocathode laser system and the plasma sources.
* K. L. F. Bane, P. B. Wilson and T. Weiland, AIP Conference Proceedings 127, p. 875, 1984
** C. Jing et al., Physical Review Letters 98, 144801, 2007
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY006  
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