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TY - CONF AU - Chen, Y. AU - Brinker, F. AU - Decking, W. AU - Good, J.D. AU - Groß, M. AU - Huang, P.W. AU - Isaev, I.I. AU - Koschitzki, C. AU - Krasilnikov, M. AU - Lal, S. AU - Li, X. AU - Lishilin, O. AU - Loisch, G. AU - Melkumyan, D. AU - Niemczyk, R. AU - Oppelt, A. AU - Qian, H.J. AU - Shaker, H. AU - Shu, G. AU - Stephan, F. AU - Vashchenko, G. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - Frequency-Detuning Dependent Transient Coaxial RF Coupler Kick J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - We model and characterize a transverse kick which results from the coaxial RF coupler in the L-band RF gun at the Photo Injector Test Facility at DESY in Zeuthen (PITZ). The RF pulse is typically 600 µs long and used to produce a train of up to 2700 electron bunches. The kick is transient and found to be dependent on the detuning of the resonance frequency of the gun cavity. The frequency detuning within the RF macro-pulse results in a variation in the kick strength along the pulse. This leads to a downstream orbit and size change of individual bunches within the train. Using 3D RF field distributions calculated at detuned frequencies of the cavity, particle tracking simulations are performed to simulate the transient kick onto the bunch train. Given a drift distance, the orbit and size change along a train of fixed length is estimated. Systematic measurements of the kick have meanwhile been carried out. The temperature of the cooling water for the gun is tuned allowing detailed characterization of the frequency detuning within the RF pulse, and thereby measurements of the kick under conditions of practical interest. Experimental findings and simulation results will be presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 599 EP - 602 KW - gun KW - cavity KW - focusing KW - simulation KW - electron DA - 2019/11 PY - 2019 SN - "" SN - 978-3-95450-210-3 DO - doi:10.18429/JACoW-FEL2019-THP007 UR - http://jacow.org/fel2019/papers/thp007.pdf ER -