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Photonics 2017, 4(1), 15; doi:10.3390/photonics4010015

Optical Klystron Enhancement to Self Amplified Spontaneous Emission at FERMI

1
Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14-km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
2
Laboratory of Quantum Optics, University of Nova Gorica, 5001 Nova Gorica, Slovenia
3
Paul Scherrer Institut, 5232 Villigen, Switzerland
4
Enea, via Enrico Fermi 45, Frascati, 00044 Roma, Italy
*
Author to whom correspondence should be addressed.
Received: 1 February 2017 / Accepted: 23 February 2017 / Published: 1 March 2017
(This article belongs to the Special Issue Extreme UV Lasers: Technologies and Applications)
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Abstract

The optical klystron enhancement to a self-amplified spontaneous emission free electron laser has been studied in theory and in simulations and has been experimentally demonstrated on a single-pass high-gain free electron laser, the FERMI FEL-1, in 2014. The main concept consists of two undulators separated by a dispersive section that converts the energy modulation induced in the first undulator in density modulation, enhancing the coherent harmonic generation in the first part of the second undulator. This scheme could be replicated in a multi-stage: the bunching is enhanced after each dispersive section, consistently reducing the saturation length. We have applied the multi-stage optical klystron (OK) scheme on the FEL-2 line at FERMI, whose layout includes three dispersive sections. Optimizing the strength of the dispersions allowed a significant increase of the self-amplified spontaneous emission (SASE) intensity in comparison to a single-stage OK and extending to the soft-X rays the OK enhanced SASE previously demonstrated on FEL-1. View Full-Text
Keywords: free electron laser; SASE; optical klystron free electron laser; SASE; optical klystron
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Penco, G.; Allaria, E.; De Ninno, G.; Ferrari, E.; Giannessi, L.; Roussel, E.; Spampinati, S. Optical Klystron Enhancement to Self Amplified Spontaneous Emission at FERMI. Photonics 2017, 4, 15.

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