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TY - CONF AU - Huang, P.W. AU - Chen, Y. AU - Filippetto, D. AU - Good, J.D. AU - Groß, M. AU - Isaev, I.I. AU - Koschitzki, C. AU - Krasilnikov, M. AU - Lal, S. AU - Li, X. AU - Lishilin, O. AU - Melkumyan, D. AU - Niemczyk, R. AU - Oppelt, A. AU - Qian, H.J. AU - Sannibale, F. AU - Shaker, H. AU - Stephan, F. AU - Tang, C.-X. AU - Vashchenko, G. AU - Wan, W. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - SINGLE SHOT CATHODE TRANSVERSE MOMENTUM IMAGING IN PHOTOINJECTORS J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In state of the art photoinjector electron sources, cathode performance determines the lower limit of achievable beam emittance. Measuring the thermal emittance at the photocathodes in electron guns is of vital importance for improving the injectors. Traditional methods, like solenoid scan, pepper-pot, need multi-shots and are time-consuming, therefore suffer from machine stability. Here we propose a new method, named cathode transverse momentum imaging. By tuning the gun solenoid focusing, the electrons’ transverse momentum at the cathode is imaged to a downstream screen, which enables a single shot measurement. Several experiments have been done at the Photo Injector Test Facility at DESY in Zeuthen (PITZ) with a Cs2Te cathode. Measurements of cathode transverse momentum, the corresponding spectra, cathode transverse momentum map and its correlation with surface electric field are presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1964 EP - 1967 DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS014 UR - http://jacow.org/ipac2019/papers/tupts014.pdf ER -