EIS: the scattering beamline at FERMI

Masciovecchio, C.; Battistoni, Andrea; Giangrisostomi, Erika; Bencivenga, Filippo; Principi, Emiliano; Mincigrucci, Riccardo; Cucini, Riccardo; Gessini, Alessandro; D’Amico, Francesco; Borghes, Roberto; Prica, Milan; Chenda, V.; Scarcia, Martin; Gaio, G.; Kurdi, G.; Demidovich, Alexander; Danailov, M. B.; Cicco, Andrea Di; Filipponi, A.; Gunnella, R.; Hatada, Keisuke; Mahne, Nicola; Raimondi, Lorenzo; Svetina, Cristian; Godnig, R.; Abrami, A.; Zangrando, Marco

doi:10.1107/s1600577515003380

Cited by 37 publications

(28 citation statements)

References 51 publications

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“…The measurements have been carried out at the EIS-TIMEX beamline of the FERMI seeded FEL facility (Elettra, Trieste, Italy) [14]. The FEL pulses (time duration ∼70 fs full-width-half-maximum (FWHM) [15], pulse energy ∼0.7 µJ) were focused on a 30 × 15 µm 2 spot size and spatially overlapped with the optical pump beam.…”

Section: Resultsmentioning

confidence: 99%

Transient EUV Reflectivity Measurements of Carbon upon Ultrafast Laser Heating

et al. 2017

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Time resolved extreme ultraviolet (EUV) transient reflectivity measurements on non-equilibrium amorphous carbon (a-C) have been carried out by combining optical and free electron laser (FEL) sources. The EUV probing was specifically sensitive to lattice dynamics, since the EUV reflectivity is essentially unaffected by the photo-excited surface plasma. Data have been interpreted in terms of the dynamics of an expanding surface, i.e., a density gradient rapidly forming along the normal surface. This allowed us to determine the characteristic time (τ 1 ps) for hydrodynamic expansion in photo-excited a-C. This finding suggests an extremely narrow time window during which the system can be assumed to be in the isochoric regime, a situation that may complicate the study of photo-induced metastable phases of carbon. Data also showed a weak dependence on the probing EUV wavelength, which was used to estimate the electronic temperature (T e ≈ 0.8 eV) of the excited sample. This experimental finding compares fairly well with the results of calculations, while a comparison of our data and calculations with previous transient optical reflectivity measurements highlights the complementarities between optical and EUV probing.

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Section: Resultsmentioning

confidence: 99%

Transient EUV Reflectivity Measurements of Carbon upon Ultrafast Laser Heating

et al. 2017

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“…The experiment was conducted at the Elastic and Inelastic Scattering–TIMEX beamline 5 at the FERMI@Elettra facility operating in the FEL-1 mode. The 56.8 eV (21.8 nm) s -polarised exciting radiation corresponds to the 12th harmonic of the seed laser.…”

Section: Methodsmentioning

confidence: 99%

EUV stimulated emission from MgO pumped by FEL pulses

Jonnard

André

Guen

et al. 2017

Structural Dynamics

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Stimulated emission is a fundamental process in nature that deserves to be investigated and understood in the extreme ultra-violet (EUV) and x-ray regimes. Today, this is definitely possible through high energy density free electron laser (FEL) beams. In this context, we give evidence for soft-x-ray stimulated emission from a magnesium oxide solid target pumped by EUV FEL pulses formed in the regime of travelling-wave amplified spontaneous emission in backward geometry. Our results combine two effects separately reported in previous works: emission in a privileged direction and existence of a material-dependent threshold for the stimulated emission. We develop a novel theoretical framework, based on coupled rate and transport equations taking into account the solid-density plasma state of the target. Our model accounts for both observed mechanisms that are the privileged direction for the stimulated emission of the Mg L2,3 characteristic emission and the pumping threshold.

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“…The experimental tests were performed at the EIS-TIMEX beamline (Masciovecchio et al, 2015) at the FERMI FEL in Trieste (Zangrando et al, 2014). The beamline optical design is characterized by an ellipsoidal focusing mirror of 1.4 m focal length.…”

Section: Methodsmentioning

confidence: 99%

A novel approach in the free-electron laser diagnosis based on a pixelated phosphor detector

Matruglio

Zilio

Sergo

et al. 2016

J Synchrotron Radiat

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A new high-performance method for the free-electron laser (FEL) focused beam diagnosis has been successfully tested at the FERMI FEL in Trieste, Italy. The novel pixelated phosphor detector (PPD) consists of micrometric pixels produced by classical UV lithography and dry etching technique, fabricated on a silicon substrate, arranged in a hexagonal geometry and filled with suitable phosphors. It has been demonstrated that the overall resolution of the system has increased by reducing the diffusion of the light in the phosphors. Various types of PPD have been produced and tested, demonstrating a high resolution in the beam profile and the ability to measure the actual spot size shot-to-shot with an unprecedented resolution. For these reasons, the proposed detector could become a reference technique in the FEL diagnosis field.

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EIS: the scattering beamline at FERMI

Cited by 37 publications

References 51 publications

Transient EUV Reflectivity Measurements of Carbon upon Ultrafast Laser Heating

Transient EUV Reflectivity Measurements of Carbon upon Ultrafast Laser Heating

EUV stimulated emission from MgO pumped by FEL pulses

A novel approach in the free-electron laser diagnosis based on a pixelated phosphor detector

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