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TY - UNPB AU - Loisch, G. AU - Chen, Y. AU - Groß, M. AU - Kalantaryan, D.K. AU - Koschitzki, C. AU - Krasilnikov, M. AU - Li, X. AU - Lishilin, O. AU - Melkumyan, D. AU - Monaco, L. AU - Niemczyk, R. AU - Oppelt, A. AU - Sertore, D. AU - Stephan, F. AU - Vashchenko, G. AU - Weilbach, T. ED - Tavares, Daniel ED - Picoreti, Renan ED - Bruno, Gustavo ED - Marques, Sergio ED - Schaa, Volker R.W. TI - Measurement of Cs₂Te Cathode Response in a High-Gradient Photoinjector J2 - Proc. of IBIC2020, Santos, Brazil, 14-18 September 2020 CY - Santos, Brazil T2 - International Beam Instrumentation Conference T3 - 9 LA - english AB - Cesium-Telluride is a widely used semiconductor photocathode material in electron photoinjectors for its high quantum efficiency and its stability in a high-gradient RF-gun environment. Even though the properties of such cathodes have been studied in the past decades, the emission process is still not fully modeled. One of the parameters that has not been directly quantified in experiment is the lengthening of electron bunches in Cs₂Te with respect to the incident UV laser pulse length - often referred to as cathode response time - due to photon penetration depth variations and scattering processes. Especially for applications such as novel accelerator technologies, ultrafast electron diffraction and free electron lasers with ever higher demands on short bunch durations, the minimum attainable bunch length from the electron gun is a decisive quantity. We present the first direct measurement of Cs₂Te cathode temporal response by measuring electron bunch lengths and profiles with a few tens of femtoseconds resolution at the Photoinjector Test facility at DESY Zeuthen (PITZ). We also show first results on the impact of photocathode properties on cathode response. PB - JACoW Publishing CP - Geneva, Switzerland ER -