Author: Fuchert, G.
Paper Title Page
TUPO005 Design Optimization for a Non-Planar Undulator for the JETI-Laser Wakefield Accelerator in Jena 1452
 
  • V. Afonso Rodriguez, T. Baumbach, A. Bernhard, G. Fuchert, A. Keilmann, P. Peiffer, C. Widmann
    KIT, Karlsruhe, Germany
  • M. Kaluza, M. Nicolai
    IOQ, Jena, Germany
  • R. Rossmanith
    Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
 
  In a laser wakefield accelerator (LWFA), excited by a femtosecond laser pulse electrons are accelerated to several 100 MeV within a few centimeters. The energy spread of the electron beam is relatively large and varies from shot to shot. In order to obtain monochromatic photons in an undulator despite the energy spread, the following idea was proposed. Two bending magnets and a drift space in between produces dispersion so that particles with different energies have different transverse positions. The beam enters a non-planar undulator, e.g. cylindrical pole geometry, where the K-value also varies with transverse position. If the two variations in the transverse direction (particle energy and K-value) compensate each other the generated light is more monochromatic than with a conventional planar undulator. In this paper such a modified undulator design optimized for the JETI-LWFA in Jena is presented. An experiment to test this concept is in preparation.