Electron beam diagnostic and the undulator field adjustment of the ELBE IR-FEL


Electron beam diagnostic and the undulator field adjustment of the ELBE IR-FEL

Evtushenko, P.; Gippner, P.; Grosse, E.; Michel, P.; Seidel, W.; Wohlfahrt, D.; Wolf, A.; Wolf, U.; Wünsch, R.; Wustmann, B.; van der Geer, C. A. J.

For the electron beam diagnostic in the undulator of the ELBE FEL two systems are completed. The first one consists of insertable OTR (Optical Transition Radiation)view screens. The same view screens will be used for the FEL optical resonator alignment. This is why there are very strong requirements on the long-term positioning reproducibility of the view screens. The second system is based on a single moveable YAG (Yttrium Aluminum Garnet activated by Cerium) screen, which can travel within the undulator vacuum chamber such that the electron beam position can be measured at any place in the undulator. Both systems are completed and successfully tested. Results of the tests as well as design ideas are presented. After transporting two undulator units to Rossendorf and installing the stainless steel vacuum chamber the magnetic field has been measured again and adjusted applying the pulsed-wire method. Irregularities of the undulator magnetic field could affect gain and wavelength of the FEL. Such effects were analyzed using numerical simulations.

  • Poster
    25th International Free Electron Laser Conference, and the 10th FEL Users Workshop 2003, 08.-12.09.2003, Tsukuba, Ibaraki, Japan
  • Contribution to proceedings
    25th International Free Electron Laser Conference, and the 10th FEL Users Workshop, Part II, 08.-12.09.2003, Tsukuba, Ibaraki, Japan
    Extended Abstracts, book edition of the proceedings, 0-444-52727-8, II-29

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Publ.-Id: 5917