FEL2017 - List of Authors (Giannessi, L.)

Paper	Title	Page
MOD04	Status and Perspectives of the FERMI FEL Facility	19
	L. Giannessi, E. Allaria, L. Badano, F. Bencivenga, C. Callegari, F. Capotondi, F. Cilento, P. Cinquegrana, M. Coreno, I. Cudin, G. D'Auria, M.B. Danailov, R. De Monte, G. De Ninno, P. Delgiusto, A.A. Demidovich, M. Di Fraia, S. Di Mitri, B. Diviacco, A. Fabris, R. Fabris, W.M. Fawley, M. Ferianis, P. Furlan Radivo, G. Gaio, D. Gauthier, F. Gelmetti, F. Iazzourene, S. Krecic, M. Lonza, N. Mahne, M. Malvestuto, C. Masciovecchio, M. Milloch, N.S. Mirian, F. Parmigiani, G. Penco, A. Perucchi, L. Pivetta, O. Plekan, M. Predonzani, E. Principi, L. Raimondi, P. Rebernik Ribič, F. Rossi, E. Roussel, L. Rumiz, C. Scafuri, C. Serpico, P. Sigalotti, S. Spampinati, C. Spezzani, M. Svandrlik, M. Trovò, A. Vascotto, M. Veronese, R. Visintini, D. Zangrando, M. Zangrando Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	FERMI is the seeded Free Electron Laser (FEL) user facility at the Elettra laboratory in Trieste, operating in the VUV to EUV and soft X-rays spectral range; the radiation produced by the seeded FEL is characterised by a number of desirable properties, such as wavelength stability, low temporal jitter and longitudinal coherence. In this paper, after an overview of the FELs performances, we will present the development plans under consideration for the next 3 to 5 years. These include an upgrade of the LINAC and of the existing FEL lines, the possibility to perform multi-pulse experiments in different configurations and an Echo Enabled Harmonic Generation experiment on FEL-2, the FEL line extending to 4 nm (310 eV).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-MOD04
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MOP005	FEL Pulse Shortening by Superradiance at FERMI	38
	N.S. Mirian, L. Giannessi Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy S. Spampinati Private Address, warrigton, United Kingdom
	Explorations of saturated superradiant regime is one of the methods that could be used to reduce the duration of the pulses delivered by FERMI. Here we present simulation studies that show the possible application of a superradiant cascade leading to a minimum pulse duration below 8 fs and to a peak power exceeding the GW level in both FEL lines FEL-1 and FEL-2.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-MOP005
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TUB05	First Demonstration of Fully Coherent Super-Radiant Pulses From a Short-Pulse Seeded FEL
	X. Yang BNL, Upton, Long Island, New York, USA L. Giannessi Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	The generation of a single X-ray isolated spike of radiation with peak power at the GW level and femtosecond temporal duration represents an almost unique opportunity for time-resolved non-linear spectroscopy. Such a condition is met by an FEL operating in superradiance. The resulting pulse has a self-similar shape deriving from the combined dynamics of saturation and slippage of the radiation over fresh electrons. The pulse is followed by a long pedestal, resulting from the complex dynamics occurring in the tail after saturation. This tail consists of a train of pulses with both transverse and longitudinal coherence and decaying amplitudes. We analyze the dynamical conditions on slippage and pulse length leading to the formation of the main pulse and the following tail. We study the correlation of the tail structure with the longitudinal phase space of the e-beam and provide recipes to partially suppress it near the background level leading to the fully coherent super-radiant pulse. Our analytical prediction of the intensity peak of the leading pulse evolving along the undulator before, during, and after becoming a super-radiant pulse agrees well with the simulations.
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THB02	Non-Standard Use of Laser Heater for FEL Control and THz Generation	566
	E. Allaria, L. Badano, M.B. Danailov, A.A. Demidovich, S. Di Mitri, D. Gauthier, L. Giannessi, G. Penco, E. Roussel, P. Sigalotti, S. Spampinati, M. Trovò, M. Veronese Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy E. Roussel SOLEIL, Gif-sur-Yvette, France
	The laser heater system is currently used at various FEL facilities for an accurate control of the electron beam energy spread in order to suppress the micro-bunching instabilities that can develop in high brightness electron beams. More recently, studies and experiments have shown that laser-electron interaction developing in the laser heater can open new possibilities for tailoring the electron beam properties to meet special requirements. A suitable time-shaping of the laser heater pulse opened the door to the generation of (tens of) femtosecond-long FEL pulses. Using standard laser techniques it is also possible to imprint onto the electron bunch, energy and density modulations in the THz frequency range that, properly sustained through the accelerator, can be exploited for generation of coherent THz radiation at GeV beam energies. Such recent results at the FERMI FEL are here reported, together with near future plans.
	Slides THB02 [14.882 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-THB02
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Paper

Title

Page

Status and Perspectives of the FERMI FEL Facility

19

L. Giannessi, E. Allaria, L. Badano, F. Bencivenga, C. Callegari, F. Capotondi, F. Cilento, P. Cinquegrana, M. Coreno, I. Cudin, G. D'Auria, M.B. Danailov, R. De Monte, G. De Ninno, P. Delgiusto, A.A. Demidovich, M. Di Fraia, S. Di Mitri, B. Diviacco, A. Fabris, R. Fabris, W.M. Fawley, M. Ferianis, P. Furlan Radivo, G. Gaio, D. Gauthier, F. Gelmetti, F. Iazzourene, S. Krecic, M. Lonza, N. Mahne, M. Malvestuto, C. Masciovecchio, M. Milloch, N.S. Mirian, F. Parmigiani, G. Penco, A. Perucchi, L. Pivetta, O. Plekan, M. Predonzani, E. Principi, L. Raimondi, P. Rebernik Ribič, F. Rossi, E. Roussel, L. Rumiz, C. Scafuri, C. Serpico, P. Sigalotti, S. Spampinati, C. Spezzani, M. Svandrlik, M. Trovò, A. Vascotto, M. Veronese, R. Visintini, D. Zangrando, M. Zangrando
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

FERMI is the seeded Free Electron Laser (FEL) user facility at the Elettra laboratory in Trieste, operating in the VUV to EUV and soft X-rays spectral range; the radiation produced by the seeded FEL is characterised by a number of desirable properties, such as wavelength stability, low temporal jitter and longitudinal coherence. In this paper, after an overview of the FELs performances, we will present the development plans under consideration for the next 3 to 5 years. These include an upgrade of the LINAC and of the existing FEL lines, the possibility to perform multi-pulse experiments in different configurations and an Echo Enabled Harmonic Generation experiment on FEL-2, the FEL line extending to 4 nm (310 eV).

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-MOD04

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP005

FEL Pulse Shortening by Superradiance at FERMI

38

N.S. Mirian, L. Giannessi
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
S. Spampinati
Private Address, warrigton, United Kingdom

Explorations of saturated superradiant regime is one of the methods that could be used to reduce the duration of the pulses delivered by FERMI. Here we present simulation studies that show the possible application of a superradiant cascade leading to a minimum pulse duration below 8 fs and to a peak power exceeding the GW level in both FEL lines FEL-1 and FEL-2.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-MOP005

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUB05

First Demonstration of Fully Coherent Super-Radiant Pulses From a Short-Pulse Seeded FEL

X. Yang
BNL, Upton, Long Island, New York, USA
L. Giannessi
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

The generation of a single X-ray isolated spike of radiation with peak power at the GW level and femtosecond temporal duration represents an almost unique opportunity for time-resolved non-linear spectroscopy. Such a condition is met by an FEL operating in superradiance. The resulting pulse has a self-similar shape deriving from the combined dynamics of saturation and slippage of the radiation over fresh electrons. The pulse is followed by a long pedestal, resulting from the complex dynamics occurring in the tail after saturation. This tail consists of a train of pulses with both transverse and longitudinal coherence and decaying amplitudes. We analyze the dynamical conditions on slippage and pulse length leading to the formation of the main pulse and the following tail. We study the correlation of the tail structure with the longitudinal phase space of the e-beam and provide recipes to partially suppress it near the background level leading to the fully coherent super-radiant pulse. Our analytical prediction of the intensity peak of the leading pulse evolving along the undulator before, during, and after becoming a super-radiant pulse agrees well with the simulations.

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THB02

Non-Standard Use of Laser Heater for FEL Control and THz Generation

566

E. Allaria, L. Badano, M.B. Danailov, A.A. Demidovich, S. Di Mitri, D. Gauthier, L. Giannessi, G. Penco, E. Roussel, P. Sigalotti, S. Spampinati, M. Trovò, M. Veronese
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
E. Roussel
SOLEIL, Gif-sur-Yvette, France

The laser heater system is currently used at various FEL facilities for an accurate control of the electron beam energy spread in order to suppress the micro-bunching instabilities that can develop in high brightness electron beams. More recently, studies and experiments have shown that laser-electron interaction developing in the laser heater can open new possibilities for tailoring the electron beam properties to meet special requirements. A suitable time-shaping of the laser heater pulse opened the door to the generation of (tens of) femtosecond-long FEL pulses. Using standard laser techniques it is also possible to imprint onto the electron bunch, energy and density modulations in the THz frequency range that, properly sustained through the accelerator, can be exploited for generation of coherent THz radiation at GeV beam energies. Such recent results at the FERMI FEL are here reported, together with near future plans.

Slides THB02 [14.882 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-THB02

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)