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Dresden 2009 – scientific programme

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DS: Fachverband Dünne Schichten

DS 26: Poster II

DS 26.44: Poster

Wednesday, March 25, 2009, 09:30–12:30, P5

XPS and UPS investigations of Cs2Te photo cathodes — •Mike Sperling1, Ruslan Ovsyannikov1, Nadja Kath1, Sara Canzio1, Hermann Duerr1, Antje Vollmer1, Sven Lederer2, Siegfried Schreiber2, Frank Stephan2, Paolo Michelato3, Laura Monaco3, Carlo Pagani3, and Daniele Sertore31HZB-BESSY II, Berlin, Germany — 2DESY, Hamburg and Zeuthen, Germany — 3INFN Milano, LASA, Milano, Italy

Caesium Telluride (Cs2Te) photo-cathodes 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. A rapidly unexpected decrease of the initially QE, from 10

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