Timing methodologies and studies at the FERMI free‐electron laser. (18th December 2017)

• Record Type: Journal Article
• Authors: Mincigrucci, Riccardo; Bencivenga, Filippo; Principi, Emiliano; Capotondi, Flavio; Foglia, Laura; Naumenko, Denys; Simoncig, Alberto; Dal Zilio, Simone; Gessini, Alessandro; Kurdi, Gabor; Mahne, Nicola; Manfredda, Michele; Matruglio, Alessia; Nikolov, Ivaylo; Pedersoli, Emanuele; Raimondi, Lorenzo; Sergo, Rudi; Zangrando, Marco; Masciovecchio, Claudio
• Is Part Of: Journal of synchrotron radiation. Volume 25:Part 1(2018)
• Page Start: 44
• Page End: 51
• Publication Date: 2017-12-18
• Subjects: cross correlation -- timing -- FEL diagnostics -- pump–probe; Synchrotron radiation -- Periodicals; Free electron lasers -- Periodicals; 539.73505
• DOI: 10.1107/S1600577517016368
• Languages: English
• ISSNs: 0909-0495

Abstract

Abstract : A description of the novel timing methodologies developed at the FERMI FEL facility is given. Abstract : Time‐resolved investigations have begun a new era of chemistry and physics, enabling the monitoring in real time of the dynamics of chemical reactions and matter. Induced transient optical absorption is a basic ultrafast electronic effect, originated by a partial depletion of the valence band, that can be triggered by exposing insulators and semiconductors to sub‐picosecond extreme‐ultraviolet pulses. Besides its scientific and fundamental implications, this process is very important as it is routinely applied in free‐electron laser (FEL) facilities to achieve the temporal superposition between FEL and optical laser pulses with tens of femtoseconds accuracy. Here, a set of methodologies developed at the FERMI facility based on ultrafast effects in condensed materials and employed to effectively determine the FEL/laser cross correlation are presented.