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TY - CONF AU - Huang, P.W. AU - Chen, Y. AU - Grigoryan, A. AU - Groß, M. AU - Isaev, I.I. AU - Kitisri, P. AU - Koschitzki, C. AU - Krasilnikov, M. AU - Lal, S. AU - Lederer, S. AU - Li, X. AU - Lishilin, O. AU - Melkumyan, D. AU - Michelato, P. AU - Monaco, L. AU - Niemczyk, R. AU - Oppelt, A. AU - Qian, H.J. AU - Sertore, D. AU - Shaker, H. AU - Shu, G. AU - Stephan, F. AU - Vashchenko, G. AU - Weilbach, T. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - Test of Cs2Te Thickness on Cathode Performance at PITZ J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - Cesium telluride is a widely used cathode in photo injectors, and its performance is one of the keys for not only emittance but also reliable operation. Over the years lots of experiences with Cs2Te photocathodes produced with the same recipe and thickness were gained at the DESY photo injectors, but cathode performance dependence on the cathode layer thickness were not investigated. In this paper, we test fresh Cs2Te cathodes with different thickness at the Photo Injector Test Facility at DESY in Zeuthen (PITZ). The QE and thermal emittance of these cathodes inside the high gradient RF gun will be compared. Besides, the injector emittance under the operation conditions of the XFEL will also be measured with these cathodes. PB - JACoW Publishing CP - Geneva, Switzerland SP - 473 EP - 476 KW - cathode KW - emittance KW - gun KW - laser KW - FEL DA - 2019/11 PY - 2019 SN - "" SN - 978-3-95450-210-3 DO - doi:10.18429/JACoW-FEL2019-WEP062 UR - http://jacow.org/fel2019/papers/wep062.pdf ER -