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- M. Veronese, A. Abrami, E. Allaria, R. Appio, L. Badano, P. Craievich, S. Di Mitri, M. Ferianis, L. Fröhlich, S. Grulja, G. Penco, M. Predonzani, F. Rossi, C. Spezzani, C. Svetina, M. Trovò, M. Tudor
ELETTRA, Basovizza, Italy
- A.O. Borga
NIKHEF, Amsterdam, The Netherlands
- F. Cianciosi
ESRF, Grenoble, France
- L. Pavlovič
University of Ljubljana, Faculty of Electrical Engineering, Ljubljana, Slovenia
- M. Petronio
DEEI, Trieste, Italy
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Frontier fast dynamics science is founded on accelerator based photon pulsed source operating now from THz to hard x-rays. The longitudinal electron bunch properties play a crucial role to assure the needed high performances and reliability at most advanced accelerator based facilities. Therefore most FELs are equipped with this a new class of demanding longitudinal diagnostics. FERMI@Elettra, the most recent running seeded FEL designed to cover the VUV/Soft x-ray range, is a brilliant example. Tight design tolerances together with the seeded scheme called for state of the art longitudinal diagnostics. We present the FERMI@elettra longitudinal electron beam diagnostics that have been designed, installed and successfully commissioned at the FERMI@Elettra accelerator. In particular we describe: the low energy longitudinal profile system using Cherencov radiation, the coherent radiation bunch length monitors (CBLM), the bunch arrival monitors (BAM), the low energy (LERFD) and high energy (HERFD) RF deflectors, the electro optical sampling stations (EOS) and the bunching strength monitor system based on coherent UV transition radiation. We introduce the design of these diagnostics and present the latest results we obtained with beam.
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