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TY - UNPB AU - Prat, E. AU - Aiba, M. AU - Bettoni, S. AU - Craievich, P. AU - Dijkstal, P. AU - Ferrari, E. AU - Ischebeck, R. AU - Löhl, F. AU - Malyzhenkov, A. AU - Orlandi, G.L. AU - Reiche, S. AU - Schietinger, T. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - Emittance Measurements and Minimization at SwissFEL J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - The transverse emittance of the electron beam is a fundamental parameter that determines the performance of free-electron-lasers (FELs). In this contribution, we present emittance measurements carried out at SwissFEL, the X-ray FEL facility that recently started to operate at PSI in Switzerland, including a description of our measurement methods and optimization procedures. We obtained slice emittance values at the undulator entrance down to ~200 nm for an electron beam with a charge of 200 pC and an r.m.s. duration of ~30 fs. Furthermore, we achieved slice emittances as low as ~100 nm for 10 pC beams with few femtosecond duration. PB - JACoW Publishing CP - Geneva, Switzerland ER -