Author: Scheer, M.
Paper Title Page
TUPEA007 Spontaneous Radiation Calculations for the European XFEL 1176
  • I.V. Agapov, G. Geloni
    XFEL. EU, Hamburg, Germany
  • O.V. Chubar
    BNL, Upton, Long Island, New York, USA
  • M. Scheer, M. Titze
    HZB, Berlin, Germany
  • N.V. Smolyakov, S.I. Tomin
    NRC, Moscow, Russia
  Calculating spontaneous radiation emission from long undulators such as those present in the European XFEL, being background to FEL radiation, is still important for several diagnostics and science cases. For realistic setups, and including effects of electron beam focusing, emittance and energy spread in the electron beam, these calculations should be performed numerically. We present these calculations for several electron beam and undulator parameters performed by various codes. Sensitivity of different spontaneous radiation characteristics, in various collection schemes, to the electron beam and undulator magnetic field parameters is studied  
TUPWO013 Non-linear Beam Transport Optics for a Laser Wakefield Accelerator 1907
  • C. Widmann, V. Afonso Rodriguez, T. Baumbach, A. Bernhard, N. Braun, B. Härer, P. Peiffer, R. Rossmanith, W. Werner
    KIT, Karlsruhe, Germany
  • O. Jäckel, M. Kaluza, M. Reuter
    HIJ, Jena, Germany
  • M. Kaluza, M. Nicolai, T. Rinck, A. Sävert
    IOQ, Jena, Germany
  • M. Scheer
    HZB, Berlin, Germany
  Funding: This work is funded by the German Federal Ministry for Education and Research under contract no. 05K10VK2 and no. 05K10SJ2
The transport and matching of electron beams generated by a Laser Wakefield Accelerator (LWFA) is a major challenge due to their large energy spread and divergence. The divergence in the range of one milli-radian at energies of some 100 MeV calls for strong focusing magnets. At the same time a chromatic correction of the magnets is needed due to the relative energy spread of a few percent. This contribution discusses in particular the layout of the beam transport optics for a diagnostic beam-line at the LWFA in Jena, Germany. The aim of this optics is to match the betatron functions and the non-zero dispersion to the x-dependent flux density amplitude of a non-planar undulator such that monochromatic undulator radiation is generated despite the large energy spread. The transport line is realized as a dogleg chicane involving several strong focusing quadrupoles. The chromatic error is compensated by additional sextupoles. To keep the setup as compact as possible the magnets are designed as combined function magnets. In this contribution the design and optimization of the transport optics, as well as its realization are presented.