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- J.H. Han, I. Bohnet, M. Krasilnikov, F. Stephan
DESY-Zeuthen, Deutsches Elektronen-Synchrotron, Zeuthen, Germany
- K. Flöttmann
DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
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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.
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