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Kostka, B.K.

Paper Title Page
THPLS122 Investigations of the Thermal Beam Load of a Superconducting In-vacuum Undulator 3568
 
  • S. Casalbuoni, MH. Hagelstein, B.K. Kostka, R. Rossmanith
    FZK, Karlsruhe
  • T. Baumbach, A. Bernhard, D. Wollmann
    University of Karlsruhe, Karlsruhe
  • E. Steffens, M. Weisser
    Erlangen University, Erlangen
  
  Both the resistive wall effect and the synchrotron radiation~\cite{wallen, casalbuoni, chou} can warm up the cold bore of a superconductive in-vacuum undulator. For the in ANKA installed superconducting undulator measurements showed that the dominant heat load contribution comes from the synchrotron radiation generated in the upstream bending magnet: 1 W per 100 mA stored current at a beam energy of 2.5 GeV and an undulator gap of 8 mm.  
THPLS123 A Year's Experience with a Superconducting Undulator in the Storage Ring ANKA 3571
 
  • R. Rossmanith, S. Casalbuoni, MH. Hagelstein, B.K. Kostka, A.-S. Müller
    FZK, Karlsruhe
  • T. Baumbach, A. Bernhard, D. Wollmann
    University of Karlsruhe, Karlsruhe
  • R. Frahm, B. Griesebock, U. Haake
    BUW, Wuppertal
  • F. Schoeck, E. Steffens, M. Weisser
    University of Erlangen-Nürnberg, Physikalisches Institut II, Erlangen
  
  In ANKA the worldwide first superconducting undulator demonstrator designed for a storage ring was operated during the last year. The undulator has 100 periods and a period length of 14 mm. During the first year the heat transfer from the beam to the cold bore was investigated and the spectra and the electrical tunability together with a monochromator was measured. The results are so encouraging that plans exist to equip ANKA with two more undulators, one with the opportunity to double electrically the period length and one with electrically variable polarization direction.  
THPLS125 A Concept on Electric Field Error Compensation for the ANKA Superconductive Undulator 3577
 
  • D. Wollmann, T. Baumbach, A. Bernhard
    University of Karlsruhe, Karlsruhe
  • S. Casalbuoni, MH. Hagelstein, B.K. Kostka, R. Rossmanith
    FZK, Karlsruhe
  • G. Gerlach
    University of Dresden, Institute for Solid-State Electronics, Dresden
  • F. Schoeck, E. Steffens, M. Weisser
    University of Erlangen-Nürnberg, Physikalisches Institut II, Erlangen
  
  In April 2005 a superconductive undulator test device, the so-called SCU14 (period length 14 mm, 100 periods) was installed at ANKA. Before installation, the magnetic field was measured and documented. This was the first test of a superconductive undulator in a storage ring and the dominating questions to be answered were related to the interaction of the undulator with the beam. The field quality was of lower importance and will be improved by a modified mechanical fabrication technique at the next superconductive undulators. Nevertheless, after finishing the fundamental beam tests the question was discussed how one would improve the field quality (minimize the phase error) of the existing undulator by local correction devices. The concepts could be used later in a weaker form for local field corrections at future undulators, if necessary.