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Frentrup, W.

Paper Title Page
TU5RFP029 Cherenkov Fibers for Beam Diagnostics at the Metrology Light Source 1159
 
  • J. Bahrdt, J. Feikes, W. Frentrup, A. Gaupp, M.V. Hartrott, M. Scheer, G. Wüstefeld
    HZB, Berlin
  • J. Kuhnhenn
    FhG, Euskirchen
  • G. Ulm
    PTB, Berlin
  
 

The 0.6 GeV storage ring Metrology Light Source (MLS) is in operation since April 2008. Recently, Cherenkov glass fibers have been installed for a temporal and spatial detection of electron beam losses. Based on this information the loss mechanisms can be studied in detail and the performance of the machine can be optimized. First experiments with this diagnostic tool will be presented.

  
TU5RFP030 Universal Mode Operation of the BESSY II UE112 APPLE Undulator 1162
 
  • J. Bahrdt, W. Frentrup, A. Gaupp, M. Scheer
    HZB, Berlin
  
 

The UE112 APPLE undulator operated at BESSY II covers the low photon energies down to the visible regime. Below 100eV the state of polarization is significantly modified by the optical components of the beamline. Moving independently three magnet rows of the APPLE undulator (universal mode) any state of polarization can be produced which permits the compensation of the beamline effects. Thus, circularly polarized light can be provided at the experiment. The dynamic multipoles of the universal mode can be compensated with flat wires which are glued onto the vacuum chamber. Simulations and first experiments with the electron beam related to the dynamic multipoles and their compensation are presented.