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Mathis, Y.-L.

Paper Title Page
WEPC046 Characterizing THz Coherent Synchrotron Radiation at the ANKA Storage Ring 2091
 
  • A.-S. Müller, I. Birkel, S. Casalbuoni, B. Gasharova, E. Huttel, Y.-L. Mathis, D. A. Moss, N. J. Smale, P. Wesolowski
    FZK, Karlsruhe
  • E. Bruendermann
    Ruhr-Universität Bochum, Bochum
  • T. Bueckle, M. Klein
    University of Karlsruhe, Karlsruhe
 
  In a synchrotron radiation source coherent infrared (IR) radiation is emitted when the bunch length is comparable to the wavelength of the emitted radiation. To generate coherent THz (far IR) radiation, the ANKA storage ring is operated regularly in a dedicated low-alpha optics. Different bunch lengths, corresponding to different spectral ranges of the THz spectrum and various electron beam energies can be offered, depending on user demand. The radiation emitted in the fringe field of a dipole magnet, the so-called edge radiation, is detected at the ANKA-IR beamline. This paper presents radiation properties like THz beam profiles and power measurements in the framework of characterising the coherent THz radiation to optimise the power, frequency and spatial output of the ANKA storage ring. First experiments showed a time averaged power of up to 0.2 mW suggesting a THz pulse peak power of at least several tens of mW.  
WEPC047 Modeling the Shape of Coherent THz Pulses Emitted by Short Bunches in an Electron Storage Ring 2094
 
  • A.-S. Müller, S. Casalbuoni, M. Fitterer, E. Huttel, Y.-L. Mathis
    FZK, Karlsruhe
  • M. T. Schmelling
    MPI-K, Heidelberg
 
  A sufficiently short electron bunch will emit coherent synchrotron radiation of wavelengths equal to or larger than the bunch length. The shape of the emitted THz pulse depends amongst other things on the original shape and length of the bunch’s charge distribution. A Michelson interferogram of the THz signal therefore contains information on the generating bunch. However, systematic effects make a bunch length measurement based on that technique non-trivial. In order to understand the variables involved, an analytical model of the pulse generation is needed. In this paper, a derivation of the THz pulse shape form first principles with special emphasis in the time domain is presented. The impact of charge distribution parameters on the Michelson interferogram is discussed.