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View article: Circular dichroism experiments at the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>L</mml:mi></mml:mrow></mml:math> edge of magnetic transition metals enabled by elliptically polarized pulses from a seeded free-electron laser
Circular dichroism experiments at the edge of magnetic transition metals enabled by elliptically polarized pulses from a seeded free-electron laser Open
International audience
View article: Design strategies and technology of Elettra 2.0 for a versatile offer to the user community
Design strategies and technology of Elettra 2.0 for a versatile offer to the user community Open
View article: Bridging the gap of storage ring light sources and linac-driven free-electron lasers
Bridging the gap of storage ring light sources and linac-driven free-electron lasers Open
High-gain free-electron lasers (FELs) are driven by short, high-charge density electron beams as only produced at dedicated single pass or recirculating linear accelerators. We describe new conceptual, technical, and modeling solutions to …
View article: On “Coherent control in the extreme ultraviolet and attosecond regime by synchrotron radiation” by Hikosaka et al, Nat. Comm. 10, 4988 (2019)
On “Coherent control in the extreme ultraviolet and attosecond regime by synchrotron radiation” by Hikosaka et al, Nat. Comm. 10, 4988 (2019) Open
View article: Elettra and Elettra 2.0
Elettra and Elettra 2.0 Open
The status of the Italian 2.4/2.0 GeV third generation light source Elettra is presented together with the future upgrade concerning the new ultra-low emittance light source Elettra 2.0 that will provide ultra-high brilliance while the ver…
View article: Attosecond delays in photoionization studied with coherent-controlled FEL
Attosecond delays in photoionization studied with coherent-controlled FEL Open
Synopsis When an electron is ejected from an atom after absorption of a photon, the photoelectron wave packet has an extremely short group delay between the photon absorption and the electron emission. This interval, called the Eisenbud-Wi…
View article: Complete Characterization of Phase and Amplitude of Bichromatic Extreme Ultraviolet Light
Complete Characterization of Phase and Amplitude of Bichromatic Extreme Ultraviolet Light Open
Intense, mutually coherent beams of multiharmonic extreme ultraviolet light can now be created using seeded free-electron lasers, and the phase difference between harmonics can be tuned with attosecond accuracy. However, the absolute value…
View article: A detailed investigation of single-photon laser enabled Auger decay in neon
A detailed investigation of single-photon laser enabled Auger decay in neon Open
Single-photon laser enabled Auger decay (spLEAD) is an electronic de-excitation process which was recently predicted and observed in Ne. We have investigated it using bichromatic phase-locked free electron laser radiation and extensive ang…
View article: Free electron laser polarization control with interfering crossed polarized fields
Free electron laser polarization control with interfering crossed polarized fields Open
Free electron lasers emit powerful and coherent radiation in a wide wavelength range extending to hard X-rays. This radiation is also characterized by a high degree of polarization that is generally linear and depends on the undulator prop…
View article: A new quantum clock for measuring photoemission delay times
A new quantum clock for measuring photoemission delay times Open
The age of attosecond physics was ushered in by the invention of methods for probing phenomena on a time scale less than femtoseconds [F. Krausz, M. Ivanov, Rev. Mod. Phys. 81, 163 (2009)]. In photoemission, the Eisenbud-Wigner-Smith (EWS)…
View article: Coherent soft X-ray pulses from an echo-enabled harmonic generation free-electron laser
Coherent soft X-ray pulses from an echo-enabled harmonic generation free-electron laser Open
X-ray free-electron lasers (FELs), which amplify light emitted by a relativistic electron beam, are extending nonlinear optical techniques to shorter wavelengths, adding element specificity by exciting and probing electronic transitions fr…
View article: Time-resolved observation of interatomic Coulombic decay induced by two-photon double excitation of Ne$_{2}$
Time-resolved observation of interatomic Coulombic decay induced by two-photon double excitation of Ne$_{2}$ Open
The hitherto unexplored two-photon doubly-excited states [Ne$^{*}$($2p^{-1}3s$)]$_{2}$ were experimentally identified using the seeded, fully coherent, intense extreme ultraviolet free-electron laser FERMI. These states undergo ultrafast i…
View article: FERMI Configuration for the Echo Enabled Harmonic Generation Experiment
FERMI Configuration for the Echo Enabled Harmonic Generation Experiment Open
The FERMI FEL-2 undulator line, normally operated in the double stage high gain harmonic generation with the fresh bunch (HGHG-FB) has been temporary modified to allow operating the FEL in the Echo Enabled Harmonic Generation (EEHG) scheme…
View article: Amplified Emission of a Soft-X Ray Free-Electron Laser Based on Echo-Enabled Harmonic Generation
Amplified Emission of a Soft-X Ray Free-Electron Laser Based on Echo-Enabled Harmonic Generation Open
We report the first evidence of substantial gain in a soft-X ray Free Electron Laser (FEL) based on Echo-Enabled Harmonic Generation (EEHG). The experiment was focused on harmonics 36 (~7.3nm) and 45 (5.8 nm) and clearly demonstrated the e…
View article: Fixed-gap Undulators for Elettra and FERMI
Fixed-gap Undulators for Elettra and FERMI Open
In the context of an R program on alternative undulator schemes, two fixed-gap, linearly polarised, adjustable-phase undulators (APUs) were built and successfully tested, the first on the FERMI free electron laser, the second on the Elettr…
View article: Status and Perspectives of the FERMI FEL Facility (2019)
Status and Perspectives of the FERMI FEL Facility (2019) Open
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 characterized by wavelength stability…
View article: First Lasing of a Free Electron Laser in the Soft X-Ray Spectral Range with Echo Enabled Harmonic Generation
First Lasing of a Free Electron Laser in the Soft X-Ray Spectral Range with Echo Enabled Harmonic Generation Open
We report on the successful operation of a Free Electron Laser (FEL) in the Echo Enabled Harmonic Generation (EEHG) scheme at the FERMI facility at Sincrotrone Trieste. The experiment required a modification of the FEL-2 undulator line whi…
View article: Coherent THz Emission Enhanced by Coherent Synchrotron Radiation Wakefield
Coherent THz Emission Enhanced by Coherent Synchrotron Radiation Wakefield Open
We demonstrate that emission of coherent transition radiation by a ∼1 GeV energy-electron beam passing through an Al foil is enhanced in intensity and extended in frequency spectral range, by the energy correlation established along the be…
View article: Two-photon absorption of soft X-ray free electron laser radiation by graphite near the carbon K-absorption edge
Two-photon absorption of soft X-ray free electron laser radiation by graphite near the carbon K-absorption edge Open
View article: Soft X-Ray Second Harmonic Generation as an Interfacial Probe
Soft X-Ray Second Harmonic Generation as an Interfacial Probe Open
Nonlinear optical processes at soft x-ray wavelengths have remained largely unexplored due to the lack of available light sources with the requisite intensity and coherence. Here we report the observation of soft x-ray second harmonic gene…
View article: Polarization Characterization of Soft X-Ray Radiation at FERMI FEL-2
Polarization Characterization of Soft X-Ray Radiation at FERMI FEL-2 Open
The control of polarization state in soft and hard X-ray light is of crucial interest to probe structural and symmetry properties of matter. Thanks to their Apple-II type undulators, the FERMI-Free Electron Lasers are able to provide ellip…
View article: Element Selective Probe of the Ultra-Fast Magnetic Response to an Element Selective Excitation in Fe-Ni Compounds Using a Two-Color FEL Source
Element Selective Probe of the Ultra-Fast Magnetic Response to an Element Selective Excitation in Fe-Ni Compounds Using a Two-Color FEL Source Open
The potential of the two-color mode implemented at the FERMI free-electron laser (FEL) source for pumping and probing selectively different atomic species has been demonstrated by time-resolved scattering experiments with permalloy (FeNi a…
View article: Time-Resolved Measurement of Interatomic Coulombic Decay Induced by Two-Photon Double Excitation of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Ne</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Time-Resolved Measurement of Interatomic Coulombic Decay Induced by Two-Photon Double Excitation of Open
The hitherto unexplored two-photon doubly excited states [Ne*$(2p−^13s)]_2$ were experimentallyidentified using the seeded, fully coherent, intense extreme ultraviolet free-electron laser FERMI. Thesestates undergo ultrafast interatomic Co…
View article: Development Perspectives at FERMI
Development Perspectives at FERMI Open
FERMI is the seeded Free Electron Laser (FEL) user facility at the Elettra laboratory in Trieste, operating in the ultraviolet to soft X-rays spectral range; the radiation produced by the seeded FEL is characterized by a number of desirabl…
View article: Elettra Status Present Upgrades and Plans
Elettra Status Present Upgrades and Plans Open
The operational status of the Italian 2.4/2.0 GeV third generation light source Elettra is presented together with an account of some present upgrades and plans for the near future.
View article: Slow Interatomic Coulombic Decay of Multiply Excited Neon Clusters
Slow Interatomic Coulombic Decay of Multiply Excited Neon Clusters Open
Ne clusters (∼5000 atoms) were resonantly excited $(2p→3s)$ by intense free electron laser (FEL)radiation at FERMI. Such multiply excited clusters can decay nonradiatively via energy exchange betweenat least two neighboring excited atoms. …
View article: Chirped pulse amplification in an extreme-ultraviolet free-electron laser
Chirped pulse amplification in an extreme-ultraviolet free-electron laser Open
View article: Coherent control with a short-wavelength free-electron laser
Coherent control with a short-wavelength free-electron laser Open
View article: Widely tunable two-colour seeded free-electron laser source for resonant-pump resonant-probe magnetic scattering
Widely tunable two-colour seeded free-electron laser source for resonant-pump resonant-probe magnetic scattering Open
View article: Fermi Upgrade Plans
Fermi Upgrade Plans Open
FERMI has reached its nominal performance on both FEL lines, FEL-1 (12 eV to 62 eV) and FEL-2 (62 eV to 310 eV). After a brief overview of the activities with users, we will describe plans for LINAC , FEL and beamline upgrades for 2016-201…