We report the first experimental evidence of enhancement of self-amplified spontaneous emission, due to the use of an optical klystron. In this free-electron laser scheme, a relativistic electron beam passes through two undulators, separated by a dispersive section. The latter converts the electron-beam energy modulation produced in the first undulator in density modulation, thus enhancing the free-electron laser gain. The experiment has been carried out at the FERMI facility in Trieste. Powerful radiation has been produced in the extreme ultraviolet range, with an intensity a few orders of magnitude larger than in pure self-amplified spontaneous emission mode. Data have been benchmarked with an existing theoretical model.



Titolo: Experimental demonstration of enhanced self-amplified spontaneous emission by an optical klystron
Autori: 
DE NINNO, GIOVANNI
FERRARI, EUGENIO
mostra contributor esterni 
Data di pubblicazione: 2015
Rivista: 
PHYSICAL REVIEW LETTERS  
Abstract: We report the first experimental evidence of enhancement of self-amplified spontaneous emission, due to the use of an optical klystron. In this free-electron laser scheme, a relativistic electron beam passes through two undulators, separated by a dispersive section. The latter converts the electron-beam energy modulation produced in the first undulator in density modulation, thus enhancing the free-electron laser gain. The experiment has been carried out at the FERMI facility in Trieste. Powerful radiation has been produced in the extreme ultraviolet range, with an intensity a few orders of magnitude larger than in pure self-amplified spontaneous emission mode. Data have been benchmarked with an existing theoretical model.
Handle: http://hdl.handle.net/11368/2857304
Digital Object Identifier (DOI): http://dx.doi.org/10.1103/PhysRevLett.114.013901
URL: http://journals.aps.org/prl/
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