Author: Sävert, A.
Paper Title Page
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.