| Paper |
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| WEPPH048 |
XPS Studies of Cs2Te Photocathodes
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457 |
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- H. A. Duerr, R. Ovsyannikov, M. Sperling, A. Vollmer
BESSY GmbH, Berlin
- J. H. Han, S. Schreiber, S. Lederer
DESY, Hamburg
- P. Michelato, L. Monaco, C. Pagani, D. Sertore
INFN/LASA, Segrate (MI)
- F. Stephan
DESY Zeuthen, Zeuthen
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Cesium Telluride (Cs2Te) photocathodes are used as sources for electron beams because of their high quantum efficiency (QE) and their ability to release high peak current electron bunches in a high gradient RF-gun. Starting from a high QE level of about 10% the quantum efficiency of these cathodes decreases during operation in a photo-injector to below 0.5%. To understand this behaviour, XPS investigations on the chemical composition were performed at BESSY. In this contribution we compare two fresh cathodes from INFN with one used under normal operation at FLASH and one used at PITZ at a higher than usual RF-gradient of 60 MV/m.
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| THAAU02 |
Operational Experience of FLASH
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- B. Faatz, S. Schreiber
DESY, Hamburg
- K. Honkavaara
Uni HH, Hamburg
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Since summer 2005 the free electron laser FLASH at DESY is operating as a user facility. It produces 10 fs long laser like pulses from the vacuum ultraviolet to the soft X-ray wavelength range. Many successful user experiments have been carried out with this world wide unique facility. In this paper we report on operational issues of the facility.
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Slides
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