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cathode

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PT29 Dark Current Measurements at the PITZ Rf Gun PITZ, gun, secondary-beams, simulation 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.