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RIS citation export for FRXB06: Direct response time measurements on semiconductor photocathodes

TY  - UNPB
AU  - Loisch, G.
AU  - Chen, Y.
AU  - Groß, M.
AU  - Kalantaryan, D.K.
AU  - Koschitzki, C.
AU  - Krasilnikov, M.
AU  - Lederer, S.
AU  - Li, X.
AU  - Lishilin, O.
AU  - Melkumyan, D.
AU  - Monaco, L.
AU  - Niemczyk, R.
AU  - Oppelt, A.
AU  - Qian, H.J.
AU  - Sertore, D.
AU  - Stephan, F.
AU  - Valizadeh, R.
AU  - Vashchenko, G.
AU  - Weilbach, T.
ED  - Liu, Lin
ED  - Byrd, John M.
ED  - Neuenschwander, Regis T.
ED  - Picoreti, Renan
ED  - Schaa, Volker R. W.
TI  - Direct response time measurements on semiconductor photocathodes
J2  - Proc. of IPAC2021, Campinas, SP, Brazil, 24-28 May 2021
CY  - Campinas, SP, Brazil
T2  - International Particle Accelerator Conference
T3  - 12
LA  - english
AB  - Semiconductor photocathodes like Cs₂Te enable stable electron sources with high photon to electron conversion rate (quantum efficiency, QE) for high brightness photoinjectors. Besides QE, work function and vacuum stability, bunch lengthening is a key figure of merit for these sources, resulting from UV photon penetration into the semiconductor and scattering of excited electrons before emission. These processes and their statistical variation lead to a delay, as well as to lengthening of the extracted electron bunch w.r.t. the incident laser pulse, often referred to as "response time". Thus far, no direct measurement of the response time of Cs₂Te, one of the most widely used cathode materials, has been reported. As such a measurement is crucial for photocathode laser based bunch shaping, short bunch applications, emission modeling and for evaluating new cathode materials like CsKSb, a measurement procedure has been established at the photoinjector test facility at DESY in Zeuthen (PITZ) to measure longitudinal bunch shape variation due to cathode emission effects. Here, we introduce the method and show first results on direct cathode response measurements of Cs₂Te cathodes.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
ER  -