Dr. Flavio Capotondi Profile

Dr. Flavio Capotondi

at Elettra-Sincrotrone Trieste SCpA

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Author

Publications (11)

Proceedings Article | 9 June 2023 Presentation + Paper

Splitting and delaying fully coherent FELs pulses for advancing ultrafast x-ray science: the AC/DC optical device at the FERMI FEL

Alberto Simoncig, Michele Manfredda, Giulio Gaio, Nicola Mahne, Lorenzo Raimondi, Claudio Fava, Simone Gerusina, Riccardo Gobessi, Alessandro Abrami, Flavio Capotondi, Dario De Angelis, Ralf Hendrik Menk, Matteo Pancaldi, Emanuele Pedersoli, Marco Zangrando

Proceedings Volume 12581, 125810B (2023) https://doi.org/10.1117/12.2668796

KEYWORDS: Free electron lasers, Ultrafast phenomena, X-rays, Optical components, Beam steering, Extreme ultraviolet

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Proceedings Article | 8 July 2021 Open Access

An approach for realizing four-wave-mixing experiments stimulated by two-color extreme ultraviolet pulses

F. Bencivenga, R. Mincigrucci, F. Capotondi, A. Calvi, R. Cucini, L. Foglia, E. Pedersoli, E. Principi, A. Simoncig, P. Cinquegrana, M. Danailov, G. De Ninno, S. Di Mitri, G. Gaio, A. Gessini, L. Giannessi, N. Mahne, M. Manfredda, I. Nikolov, G. Penco, L. Raimondi, P. Ribič, C. Svetina, M. Trovò, M. Zangrando, C. Masciovecchio

Proceedings Volume 11886, 118860E (2021) https://doi.org/10.1117/12.2593345

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Proceedings Article | 14 May 2019 Presentation

Time-resolved studies of the diamond-to-graphite transition induced by a short-wavelength free-electron laser radiation (Conference Presentation)

Sven Toleikis, Franz Tavella, Hauke Höppner, Victor Tkachenko, Nikita Medvedev, Flavio Capotondi, Torsten Golz, Yun Kai, Michele Manfredda, Emanuele Pedersoli, Mark Prandolini, Nikola Stojanovic, Takanori Tanikawa, Ulrich Teubner, Beata Ziaja

Proceedings Volume 11035, 1103508 (2019) https://doi.org/10.1117/12.2523139

KEYWORDS: Free electron lasers, Extreme ultraviolet, Diamond, Laser optics, Phase measurement, Time metrology, Ultrafast phenomena, Femtosecond phenomena

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Proceedings Article | 17 May 2017 Presentation + Paper

Four-wave-mixing experiments and beyond: the TIMER/mini-TIMER setups at FERMI

Laura Foglia, Filippo Bencivenga, Riccardo Mincigrucci, Alberto Simoncig, Andrea Calvi, Riccardo Cucini, Emiliano Principi, Marco Zangrando, Nicola Mahne, Michele Manfredda, Lorenzo Raimondi, Emanuele Pedersoli, Flavio Capotondi, Maya Kiskinova, Claudio Masciovecchio

Proceedings Volume 10237, 102370C (2017) https://doi.org/10.1117/12.2268068

KEYWORDS: Mirrors, Laser beam diagnostics, Scattering, Laser scattering, Signal detection, Diffraction, Extreme ultraviolet, Free electron lasers, Nonlinear optics, Raman scattering, Photon polarization, Polarization, X-rays, Four wave mixing, Raman spectroscopy, Spectroscopy

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Proceedings Article | 2 November 2016 Presentation

Wavefront sensor based diagnostic of FERMI FEL photon beam (Conference Presentation)

Lorenzo Raimondi, Nicola Mahne, Michele Manfredda, Cristian Svetina, Daniele Cocco, Flavio Capotondi, Emanuele Pedersoli, Maya Kiskinova, Marco Zangrando

Proceedings Volume 9965, 99650F (2016) https://doi.org/10.1117/12.2239212

KEYWORDS: Free electron lasers, Wavefront sensors, Diagnostics, Wavefronts, Mirrors, Imaging systems, Sensors, Wave propagation, Diffraction, X-ray optics

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FERMI is the first seeded EUV-SXR free electron laser (FEL) user facility, and it is operated at Elettra Sincrotrone Trieste. Two of the four already operating beamlines, namely LDM (Low Density Matter) and DiProI (Diffraction and Projection Imaging), use a Kirkpatrick-Baez (K-B) active X-ray optics system for focusing the FEL pulses onto the target under investigation. A wafefront sensor is used as diagnostic for the characterization of the focused spot and for the optimization of the parameters of these active optical systems as well. The aim of this work is, first, to describe in detail the optimization procedure using the wavefront sensor through the minimization of the Zernike coefficients, and second, report on the final results obtained on the K-B optical system at the DiProI endstation. The wavefront sensor, mounted out of focus behind the DiProI chamber, allows to compute the intensity distribution of the FEL beam, typically a mix between several modes resulting in a ”noisy hyper-Gaussian” intensity profile, and the wavefront residual from ideal propagation shape and after tilt correction. Combining these two measures we can obtain the electric field of the wave out of focus. Propagating back the electric field we reconstruct the focal spot in far field approximation. In this way the sensor works as a diagnostic reconstructing the focal spot. On the other hand, after modelling the electric field with a Zernike polynomial it is easy and fast to optimize the mirror bending and the optical system angles by minimizing the aberrations, quantified in terms of Zernike coefficients. Since each coefficient corresponds to a single parameter, they can be minimized one at the time. Online wavefront measurements have made possible the optimization of the bending acting on the mirror curvature, and of the (pitch and roll) angle positions of the K-B system. From the wavefront measurements we have inferred a focal spot for DiProI of 5.5 μm x 6.2 μm at 32 nm wavelength, confirmed by the PMMA ablation imprints. The experimental results were compared with the predictions from simulations obtained using the WISE code, starting from the characterization of the actual mirror surface metrology. The results from simulations were found to be in agreement with the experimental measurements.

Proceedings Article | 12 May 2015 Paper

Optically induced Fe magnetization reversal in Fe/MnAs/GaAs(001)

C. Spezzani, E. Ferrari, E. Allaria, F. Vidal, L. Lounis, A. Ciavardini, R. Delaunay, F. Capotondi, E. Pedersoli, M. Coreno, C. Svetina, L. Raimondi, M. Zangrando, R. Ivanov, I. Nikolov, A. Demidovich, M. Danailov, G. De Ninno, H. Popescu, M. Eddrief, M. Kiskinova, M. Sacchi

Proceedings Volume 9512, 95120I (2015) https://doi.org/10.1117/12.2184710

KEYWORDS: Iron, Pulsed laser operation, Picosecond phenomena, Magnetism, Laser optics, Laser scattering, Free electron lasers, Reflectivity, Scattering, Diffusion

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Proceedings Article | 12 May 2015 Paper

FEL-based transient grating spectroscopy

F. Bencivenga, R. Cucini, F. Capotondi, A. Battistoni, R. Mincigrucci, E. Giangrisostomi, A. Gessini, M. Manfredda, I. Nikolov, E. Pedersoli, E. Principi, C. Svetina, P. Parisse, F. Casolari, M. Danailov, M. Kiskinova, C. Masciovecchio

Proceedings Volume 9512, 951212 (2015) https://doi.org/10.1117/12.2186121

KEYWORDS: Free electron lasers, Mirrors, Nonlinear optics, Extreme ultraviolet, Charge-coupled devices, CCD image sensors, Beam splitters, X-rays, Sensors, Phase matching

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Proceedings Article | 8 October 2014 Paper

Polarization measurement of free electron laser pulses in the VUV generated by the variable polarization source FERMI

P. Finetti, E. Allaria, B. Diviacco, C. Callegari, B. Mahieu, J. Viefhaus, M. Zangrando, G. De Ninno, G. Lambert, E. Ferrari, J. Buck, M. Ilchen, B. Vodungbo, N. Mahne, C. Svetina, C. Spezzani, S. Di Mitri, G. Penco, M. Trovò, W. Fawley, P. Rebernik, D. Gauthier, C. Grazioli, M. Coreno, B. Ressel, A. Kivimäki, T. Mazza, L. Glaser, F. Scholz, J. Seltmann, P. Gessler, J. Grünert, A. De Fanis, M. Meyer, A. Knie, S. Moeller, L. Raimondi, F. Capotondi, E. Pedersoli, O. Plekan, M. Danailov, A. Demidovich, I. Nikolov, A. Abrami, J. Gautier, J. Lüning, P. Zeitoun, L. Giannessi

Proceedings Volume 9210, 92100K (2014) https://doi.org/10.1117/12.2062717

KEYWORDS: Polarization, Polarimetry, Free electron lasers, Vacuum ultraviolet, Wave plates, Luminescence, Visible radiation, Mirrors, Dichroic materials, Photon polarization

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Proceedings Article | 17 September 2014 Paper

Status of the K-B bendable optics at FERMI@Elettra FEL

L. Raimondi, C. Svetina, N. Mahne, D. Cocco, F. Capotondi, E. Pedersoli, M. Manfredda, M. Kiskinova, B. Keitel, G. Brenner, E. Plönjes, T. Mey, K. Mann, M. Zangrando

Proceedings Volume 9208, 920804 (2014) https://doi.org/10.1117/12.2062326

KEYWORDS: Mirrors, Free electron lasers, Diffraction, Wavefronts, Polymethylmethacrylate, Point spread functions, Wavefront sensors, Imaging systems, Metrology, X-ray optics

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FERMI is the first seeded EUV-SXR free electron laser (FEL) user facility operated at Elettra Sincrotrone Trieste. Two of the three already operating beamlines, namely LDM (Low DensityMatter) and DiProI (Diffraction and Projection Imaging), use a Kirkpatrick-Baez (K-B) active X-ray optics system for focusing the FEL pulses onto the target under investigation. The present work reports on the final results obtained from the optimization of the K-B optical system at the DiProI endstation. The aim of the optimization is to improve the system performances in terms of quality and size of the focal spot onto the sample, controlling the fluence as well. To characterize the performances and develop reliable and reproducible focusing procedures we performed a campaign of measurements with several diagnostic systems, including a wavefront sensor mounted after the DiProI chamber. Online wavefront measurements have made possible the optimization of the bending acting on the mirror curvature and of the (pitch and roll) angle positions of the K-B system. From the wavefront measurements we have inferred a focal spot of 8 μm x 9.5 μm, confirmed by the PMMA ablation imprints. The experimental results are compared with the predictions from simulations obtained using the WISE code, starting from the characterization of the actual mirror surface metrology. The results from simulations are in agreement with the experimental measurements. Filtering the Fourier transform of the mirror surface profiles, using the WISE code we have analyzed the impact of different spatial wavelengths on the focal spot degradation. For different energies of the incident beam we established the threshold where the focal spot degradation is no longer affected by the spatial wavelengths of the K-B mirror surfaces. In the very last period we were starting to observe a degradation of the focal spot. After a metrology analysis we concluded that the problem was due to a failure of the substrate material. We temporally solved the problem checking the mounting, but we have planned an improvement of the material for the future.

Proceedings Article | 30 September 2013 Paper

Status and achievements at FERMI@Elettra: the first double cascade seeded EUV-SXR FEL facility open to users

Cristian Svetina, Nicola Mahne, Lorenzo Raimondi, Luca Rumiz, Marco Zangrando, Enrico Allaria, Filippo Bencivenga, Carlo Callegari, Flavio Capotondi, Davide Castronovo, Paolo Cinquegrana, Paolo Craievich, Ivan Cudin, Massimo Dal Forno, Miltcho Danailov, Gerardo D'Auria, Raffaele De Monte, Giovanni De Ninno, Alexander Demidovich, Simone Di Mitri, Bruno Diviacco, Alessandro Fabris, Riccardo Fabris, William Fawley, Mario Ferianis, Eugenio Ferrari, Lars Froehlich, Paolo Furlan Radivo, Giulio Gaio, Luca Giannessi, Maya Kiskinova, Marco Lonza, Benoit Mahieu, Claudio Masciovecchio, Ivaylo Nikolov, Fulvio Parmigiani, Emanuele Pedersoli, Giuseppe Penco, Mauro Predonzani, Emiliano Principi, Fabio Rossi, Claudio Scafuri, Claudio Serpico, Paolo Sigalotti, Simone Spampinati, Carlo Spezzani, Michele Svandrlik, Mauro Trovo, Alessandro Vascotto, Marco Veronese, Roberto Visintini, Dino Zangrando

Proceedings Volume 8849, 88490O (2013) https://doi.org/10.1117/12.2023920

KEYWORDS: Free electron lasers, YAG lasers, Mirrors, Pulsed laser operation, Calibration, Diagnostics, Electron beams, Switching, Sensors, X-rays

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Proceedings Article | 27 September 2013 Paper

K-B bendable system optimization at FERMI@Elettra FEL: impact of different spatial wavelengths on the spot size

L. Raimondi, C. Svetina, N. Mahne, D. Cocco, F. Capotondi, E. Pedersoli, M. Kiskinova, B. Keitel, G. Brenner, E. Plönjes, T. Mey, K. Mann, M. Zangrando

Proceedings Volume 8848, 88480B (2013) https://doi.org/10.1117/12.2023024

KEYWORDS: Mirrors, Free electron lasers, Wavefronts, Wavefront sensors, Diffraction, Polymethylmethacrylate, Point spread functions, Computer simulations, Atomic force microscopy, X-ray optics

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Showing 5 of 11 publications

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