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Han, J.H.

Paper Title Page
PT22 Measurement of the longitudinal phase space at the Photo Injector Test Facility at DESY Zeuthen 222
 
  • J. Bähr, I. Bohnet, J.H. Han, M. Krasilnikov, D. Lipka, V. Miltchev, A. Oppelt, F. Stephan
    DESY-Zeuthen, Deutsches Elektronen-Synchrotron, Zeuthen, Germany
  • K. Flöttmann
    DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
 
  The photo injector test facility at DESY Zeuthen (PITZ) has been developed with the aim to deliver low emittance electron beams and study its characteristics for future applications at free electron lasers and linear accelerators. The energy of the electron beam varies in the range between 4 and 5 MeV. One of the important properties of the delivered beam is the longitudinal phase space of the electron beam. Measurements of the momentum distributions show a small energy spread. The principle of the measurement of the bunch length will be discussed, time resolutions will be shown and preliminary results will be given. The design to measure the correlation between momentum and time distribution of the electron bunch will be shown with calculated resolutions.  
PT29 Dark Current Measurements at the PITZ Rf Gun 242
 
  • J.H. Han, I. Bohnet, M. Krasilnikov, F. Stephan
    DESY-Zeuthen, Deutsches Elektronen-Synchrotron, Zeuthen, Germany
  • K. Flöttmann
    DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
 
  For photoelectron rf guns with acceleration gradients of 40 MV/m or higher at the photo cathode operated at the rf pulse length of 100 μs or more, the amount of dark current might be comparable with the photoelectron beam. Strong dark current can cause multipacting, radiation damages and cryogenic losses. At the photo injector test facility at DESY Zeuthen (PITZ) the dark current was measured with various solenoid setups at the rf gun by Faraday cup. We compare the dark current behavior of different photo cathodes. Experimental results are discussed with simulations.