Paper | Title | Other Keywords | Page | ||
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PM05 | Optical Transmission Line For Streak Camera Measurements at Pitz | diagnostics, electron, longitudinal-dynamics, optics, PITZ | 98 | ||
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The photoinjector injector test facility at DESY Zeuthen (PITZ) [1]
produces electrons with a momentum of about 4 MeV/c. It is the aim to
measure the temporal characteristics of the electron bunch train and
single bunches with high accuracy of the order of 1 ps and less. Several
types of streak cameras will be used in combination with different
radiators which transform particle energy in light. The problem to be
solved is the light transport over a distance of about 27 m. Basic demands
to the optical system and design principles will be explained. The
optical and technical solutions will be presented. The strategy of
adjustment and commissioning of the optical system will be described. The
system contains switchable optics to use different radiators (OTR,
Cherenkov radiators). Diagnostic tools are foreseen at different
positions along the optical axis. The results of different measurements
in the lab and using the original system will be presented. The problems
on the minimalization of the time dipersion in the system will be
discussed.
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[1] F.Stephan, et al., Photo injector test facility under construction at DESY Zeuthen, FEL 2000, Durham |
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PT29 | Dark Current Measurements at the PITZ Rf Gun | PITZ, cathode, secondary-beams, simulation | 242 | ||
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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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