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Golubeva, N.

Paper Title Page
TUPC030 Transverse Electron Beam Size Effect on the Bunch Profile Determination with Coherent Radiation Diagnostics 1113
 
  • O. Grimm, H. Delsim-Hashemi, J. Rossbach
    Uni HH, Hamburg
  • V. Balandin, N. Golubeva
    DESY, Hamburg
 
  Longitudinal diagnostics of electron bunches can be done by measurement of coherent radiation (e.g., in the form of transition radiation) and subsequent extraction of the form factor. By measuring short wavelengths, fine structures in the bunch can be resolved. However, the form factor depends on the three-dimensional charge density distribution, and the usual practice of considering only a one-dimensional line charge in interpreting the radiation spectra is questionable, as the finite transverse extend of the electron bunch can reduce the form factor magnitude at short wavelengths. An experimental study of this issue using a two stage single shot spectrometer has been carried out at the FLASH free-electron laser at DESY, Hamburg. The coherent transition radiation spectra for two beam optics settings were recorded and compared. In one setting the transverse beam size at the transition radiation target screen has been blown up by a factor of about 3.5 compared to the second setting. The ratio of these two spectra shows a suppression of radiation intensity at short wavelengths, as expected from a theoretical calculation. In this paper the result of this study is presented.  
TUPP017 Orbit and Dispersion Tool at FLASH 1565
 
  • E. Prat, V. Balandin, N. Golubeva
    DESY, Hamburg
  • J. K. Kamenik, I. Kriznar, T. Kusterle
    Cosylab, Ljubljana
 
  Based on a former MATLAB tool, a java-based application to measure and correct orbit and dispersion has been developed at FLASH. In this paper we discuss the algorithm used in this tool as well as its functionality. First tests on machine operation are also presented.