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Control of the Polarization of a Vacuum-Ultraviolet, High-Gain, Free-Electron Laser

Enrico Allaria Bruno Diviacco Carlo Callegari 1 Paola Finetti 2 Benoît Mahieu Jens Viefhaus Marco Zangrando 3 Giovanni de Ninno 4, 5 Guillaume Lambert 6 Eugenio Ferrari Jens Buck Markus Ilchen Boris Vodungbo 7 Nicola Mahne 8 Cristian Svetina 9 Carlo Spezzani 10 Simone Di Mitri Giuseppe Penco 11 Mauro Trovó William M. Fawley Primoz R. Rebernik David Gauthier 12 Cesare Grazioli Marcello Coreno 13 Barbara Ressel Antti Kivimäki 14 Tommaso Mazza Leif Glaser Frank Scholz 15 Joern Seltmann 16 Patrick Gessler Jan Grünert 17 Alberto de Fanis 18 Michael Meyer André Knie 19 Stefan P. Moeller 20 Lorenzo Raimondi Flavio Capotondi 21, 22 Emanuele Pedersoli Oksana Plekan Miltcho B. Danailov Alexander Demidovich Ivaylo Nikolov 23, 24 Alessandro Abrami Julien Gautier 25 Jan Lüning 26 Philippe Zeitoun 7 Luca Giannessi 27
Abstract : The two single-pass, externally seeded free-electron lasers (FELs) of the FERMI user facility are designed around Apple-II-type undulators that can operate at arbitrary polarization in the vacuum ultraviolet-to-soft x-ray spectral range. Furthermore, within each FEL tuning range, any output wavelength and polarization can be set in less than a minute of routine operations. We report the first demonstration of the full output polarization capabilities of FERMI FEL-1 in a campaign of experiments where the wavelength and nominal polarization are set to a series of representative values, and the polarization of the emitted intense pulses is thoroughly characterized by three independent instruments and methods, expressly developed for the task. The measured radiation polarization is consistently >90% and is not significantly spoiled by the transport optics; differing, relative transport losses for horizontal and vertical polarization become more prominent at longer wavelengths and lead to a non-negligible ellipticity for an originally circularly polarized state. The results from the different polarimeter setups validate each other, allow a cross-calibration of the instruments, and constitute a benchmark for user experiments.
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Submitted on : Monday, June 15, 2015 - 2:09:51 PM
Last modification on : Friday, December 3, 2021 - 11:34:03 AM

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Enrico Allaria, Bruno Diviacco, Carlo Callegari, Paola Finetti, Benoît Mahieu, et al.. Control of the Polarization of a Vacuum-Ultraviolet, High-Gain, Free-Electron Laser. European Physical Education Review, SAGE Publications, 2014, 4 (4), pp.041040. ⟨10.1103/PhysRevX.4.041040⟩. ⟨hal-01163727⟩

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