0482938 - FZÚ 2018 RIV US eng J - Journal Article
Finetti, P. - Höppner, H. - Allaria, E. - Callegari, C. - Capotondi, F. - Cinquegrana, P. - Coreno, M. - Cucini, R. - Danailov, M.B. - Demidovich, A. - De Ninno, G. - Di Fraia, M. - Feifel, R. - Ferrari, E. - Fröhlich, L. - Gauthier, D. - Golz, T. - Grazioli, C. - Kai, Y. - Kurdi, G. - Mahne, N. - Manfredda, M. - Medvedev, Nikita - Nikolov, I.P. - Pedersoli, E. - Penco, G. - Plekan, O. - Prandolini, M.J. - Prince, K. C. - Raimondi, L. - Rebernik, P. - Riedel, R. - Roussel, E. - Sigalotti, P. - Squibb, R. - Stojanovic, N. - Stranges, S. - Svetina, C. - Tanikawa, T. - Teubner, U. - Tkachenko, V. - Toleikis, S. - Zangrando, M. - Ziaja, B. - Tavella, F. - Giannessi, L.
Pulse duration of seeded free-electron lasers.
Physical Review X. Roč. 7, č. 2 (2017), s. 1-19, č. článku 021043. ISSN 2160-3308. E-ISSN 2160-3308
Institutional support: RVO:68378271
Keywords : ray free-eletron * amplified spontaneous-emission * spectral-phase interferometry * order harmonic radiation * extreme-ultraviolet * cross-correlation
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 14.385, year: 2017

The pulse duration, and the temporal intensity profile of free-electron laser (FEL) pulses, is of utmost importance for exploring the new perspectives offered by FELs, it is a nontrivial experimental parameter that needs to be characterized. We measured the pulse shape of an extreme ultraviolet externally seeded FEL operating in high-gain harmonic generation mode. Two different methods based on the cross-correlation of the FEL pulses with an external optical laser were used. The two methods, one capable of single-shot performance, may both be implemented as online diagnostics in FEL facilities. The measurements were carried out at the seeded FEL facility FERMI. The FEL temporal pulse characteristics were measured and studied in a range of FEL wavelengths and machine settings, and they were compared to the predictions of a theoretical model. The measurements allowed a direct observation of the pulse lengthening and splitting at saturation, in agreement with the proposed theory.

Permanent Link: http://hdl.handle.net/11104/0278320