The ALPHA-X beam line: toward a compact FEL

Maria Pia Anania, David Clark, Riju Issac, Dino Jaroszynski, Albert Reitsma, Gregor H. Welsh, Mark Wiggins, Ulrich Schramm, M. J. de Loos, S.B. van der Geer, J.A. Clarke, M.W. Poole, B. J. A. Shepherd

Research output: Contribution to conferencePaper

2 Citations (Scopus)


Recent progress in developing laser-plasma accelerators is raising the possibility of a compact coherent radiation source that could be housed in a medium-sized university department. Beam properties from laser-plasma accelerators have been traditionally considered as not being of sufficient quality to produce amplification. Our work shows that this is not the case. Here we present a study of the beam characteristics of a laser-plasma accelerator. We also highlight the latest results on the ALPHA-X compact FEL. We show how the beam
properties of the ALPHA-X beam line have been optimized in order to drive a FEL. We discuss the implementation of a focussing system consisting of a triplet of permanent magnet quadrupoles and a triplet of electromagnetic quadrupoles. The design of these devices has been carried out using the GPT (General Particle
Tracer*) code, which considers space charge effects and allows a realistic estimate of electron beam properties along the beam line. The latest measurements of energy spread and emittance will be presented. Currently we
have measured energy spreads less than 0.7% and, using a pepper pot, put an upper limit on the emittance of 5 pi mm mrad.
Original languageEnglish
Publication statusPublished - Aug 2009
Event31st International Free Electron Laser Conference -
Duration: 31 Mar 2011 → …


Other31st International Free Electron Laser Conference
Period31/03/11 → …


  • beam line
  • compact FEL
  • laser-plasma accelerators


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