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TY - UNPB AU - Ferrari, E. ED - Schaa, Volker RW ED - Arduini, Gianluigi ED - Pranke, Juliana ED - Seidel, Mike ED - Lindroos, Mats TI - Polarization Control in High Gain Free Electron Lasers J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017 C1 - Copenhagen, Denmark T2 - International Particle Accelerator Conference T3 - 8 LA - english AB - Methods for the control of polarization of the radiation emitted in high gain free electron lasers (FELs) are recalled. The first demonstration of full polarization control in the extreme ultra-violet at FERMI FEL is presented, and the polarization characterized by three independent instruments and methods. The measured radiation polarization is consistently > 90%; observed effects of photon beam transport from the undulator to the radiation detectors is discussed. The results from the different polarimeter setups validate each other, allow a cross-calibration of the instruments, and constitute a benchmark for user experiments.* PB - JACoW CP - Geneva, Switzerland ER -