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Bueckle, T.     [Bückle, T.]

Paper Title Page
TU5RFP027 Observation of Coherent THz Radiation from the ANKA and MLS Storage Rings with a Hot Electron Bolometer 1153
 
  • A.-S. Müller, I. Birkel, E. Huttel, Y.-L. Mathis, N.J. Smale
    FZK, Eggenstein
  • E. Bründermann
    Ruhr-Universität Bochum, Bochum
  • T. Bückle, M. Fitterer, S. Hillenbrand, N. Hiller, A. Hofmann, V. Judin, M. Klein, S. Marsching, K.G. Sonnad
    KIT, Karlsruhe
  • J. Feikes, M.V. Hartrott
    HZB, Berlin
  • H.W. Huebers, A. Semenov
    DLR, Berlin
  • R. Klein, R. Müller, G. Ulm
    PTB, Berlin
  • G. Wüstefeld
    BESSY GmbH, Berlin
  
 

Funding: This work has partly been supported by the Initiative and Networking Fund of the Helmholtz Association under contract number VH-NG-320.


In synchrotron radiation sources coherent radiation is emitted when the bunch length is comparable to or shorter than the wavelength of the emitted radiation. A detector system based on a superconducting NbN ultra-fast bolometer with an intrinsic response time of about 100 ps jointly developed by the University of Karlsruhe (Institute of micro- and nanoelectronic systems) and German Aerospace Center (Berlin) was used to resolve the radiation emitted from single bunches. This paper reports the observations made during measurements at the MLS and ANKA storage rings.

  
FR5RFP095 Studies of Bunch Distortion and Bursting Threshold in the Generation of Coherent THz-Radiation at the ANKA Storage Ring 4761
 
  • M. Klein, T. Bückle, M. Fitterer, A. Hofmann, A.-S. Müller, K.G. Sonnad
    KIT, Karlsruhe
  • I. Birkel, E. Huttel, Y.-L. Mathis
    FZK, Karlsruhe
  
 

Funding: This work has been supported by the Initiative and Networking Fund of the Helmholtz Association under contract number VH-NG-320.


In synchrotron light sources, coherent synchrotron radiation (CSR) is emitted at wavelengths comparable to and longer than the bunch length. One effect of the CSR wake field is the distortion of the bunch distribution, which increases with higher currents. In the theoretical calculations, a threshold exists beyond which the solutions begin to diverge. On the other hand, the CSR wake can also excite a micorbunching instability which prevents stable emission of CSR for high currents and leads to highly intense bursts of radiation. In this paper the development of the calculated bunch shapes and the corresponding moments of the current distribution for varying bunch currents are studied. It can be shown that the numerical threshold beyond which the solutions diverge, does not coincide with the observed bursting-stable-threshold at the ANKA storage ring, which agrees well with theory.