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TY - UNPB AU - Dehn, M.A. AU - Aulenbacher, K. AU - Bechthold, V. AU - Fichtner, F. ED - Ramberger, Suitbert ED - Draper, Mick ED - Schaa, Volker RW TI - Longitudinal Halo From NEA and PEA Photocathodes J2 - Proc. of ERL2017, Geneva, Switzerland, June 18-23, 2017 C1 - Geneva, Switzerland T2 - ICFA Advanced Beam Dynamics Workshop T3 - 59 LA - english AB - For high average electron beam currents the length of the electron bunches must match the acceptance of the accelerator. At Johannes Gutenberg-Universität we are able to measure the longitudinal pulse responses of different photocathodes: negative electron affinity (NEA) types and positive electron affinity (PEA) types. With NEA (Cs:GaAs), the pulse response depends on the wavelength of photoexcitation and show at 800nm a long and relatively intense tail whereas at 400nm a similar shape but with orders of magnitude lower intensity is observed. In comparison to this distribution, PEA pulse responses (K2CsSb) show a similar shape as well but another order of magnitude less intensity than NEA in the blue excitation. PB - JACoW Publishing CP - Geneva, Switzerland ER -