113 results on '"Danailov, M. B."'
Search Results
102. High harmonic source for seeding of FERMI@Elettra
- Author
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Goh, S. J., Slot, P. J. M., Bert Bastiaens, Biedron, S. G., Danailov, M. B., Milton, S. V., Herek, J., Boller, K. J., Laser Physics & Nonlinear Optics, and Optical Sciences
- Abstract
FERMI@Elettra is a free electron laser user facility that will produce high-brightness, ultra-short pulses with broad wavelength coverage for a wide range of user experiments. Currently, FERMI uses the HGHG technique to improve both the longitudinal and spectral coherence and the stability of the output of the laser. Using a High Harmonic (HH) source to drive the HGHG process will allow FERMI to reach shorter wavelengths with a single stage. It also will provide a comparison between HH and HGHG seeding methods. For the HH source, we will use neutral atoms in a hollow waveguide in combination with pulse shaping of the drive laser pulse to provide wavelength tuning as well as selective enhancement of the harmonic orders. In this paper, we the discuss the scaling of HH generation to several hundreds of nanoJoule pulse energy at a specific harmonic (several tens of MW peak power) and present the HH source under construction at the university of Twente.
103. First operation of the electro optical sampling diagnostics of the FERMI@Elettra FEL
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Marco Veronese, Abrami, A., Allaria, E., Bossi, M., Danailov, M. B., Ferianis, M., Fröhlich, L., Grulja, S., Predonzani, M., Rossi, F., Scalamera, G., Spezzani, C., Tudor, M., and Trovò, M.
104. FEL-based transient grating spectroscopy
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Biedron, Sandra G., Bencivenga, F., Cucini, R., Capotondi, F., Battistoni, A., Mincigrucci, R., Giangrisostomi, E., Gessini, A., Manfredda, M., Nikolov, I. P., Pedersoli, E., Principi, E., Svetina, C., Parisse, P., Casolari, F., Danailov, M. B., Kiskinova, M., and Masciovecchio, C.
- Published
- 2015
- Full Text
- View/download PDF
105. The MagneDyn beamline at the FERMI free electron laser
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Marco Malvestuto, Antonio Caretta, Richa Bhardwaj, Simone Laterza, Fulvio Parmigiani, Alessandro Gessini, Matteo Zamolo, Fabio Galassi, Rudi Sergo, Giuseppe Cautero, Miltcho B. Danailov, Alexander Demidovic, Paolo Sigalotti, Marco Lonza, Roberto Borghes, Adriano Contillo, Alberto Simoncig, Michele Manfredda, Lorenzo Raimondi, Marco Zangrando, Malvestuto, M., Caretta, A., Bhardwaj, R., Laterza, S., Parmigiani, F., Gessini, A., Zamolo, M., Galassi, F., Sergo, R., Cautero, G., Danailov, M. B., Demidovic, A., Sigalotti, P., Lonza, M., Borghes, R., Contillo, A., Simoncig, A., Manfredda, M., Raimondi, L., and Zangrando, M.
- Subjects
Time resolved X-ray spectroscopy ,Instrumentation - Abstract
The scope of this paper is to outline the main marks and performances of the MagneDyn beamline, which was designed and built to perform ultrafast magnetodynamic studies in solids. Open to users since 2019, MagneDyn operates with variable circular and linear polarized femtosecond pulses delivered by the externally laser-seeded FERMI free-electron laser (FEL). The very high degree of polarization, the high pulse-to-pulse stability, and the photon energy tunability in the 50-300 eV range allow performing advanced time-resolved magnetic dichroic experiments at the K-edge of light elements, e.g., carbon and at the M- and N-edge of the 3d-transition-metals and rare earth elements, respectively. To this end, two experimental end-stations are available. The first is equipped with an in situ dedicated electromagnet, a cryostat, and an extreme ultraviolet Wollaston-like polarimeter. The second, designed for carry-in user instruments, hosts also a spectrometer for pump-probe resonant x-ray emission and inelastic spectroscopy experiments with a sub-eV energy resolution. A Kirkpatrick-Baez active optics system provides a minimum focus of similar to 20x20 mu m(2) FWHM at the sample. A pump laser setup, synchronized with the FEL-laser seeding system, delivers sub-picosecond pulses with photon energies ranging from the mid-IR to near-UV for optical pump-FEL probe experiments with a minimal pump-probe jitter of few femtoseconds. The overall combination of these features renders MagneDyn a unique state-of-the-art tool for studying ultrafast magnetic and resonant emission phenomena in solids. Published under an exclusive license by AIP Publishing.
- Published
- 2022
106. Characterization of soft x-ray echo-enabled harmonic generation free-electron laser pulses in the presence of incoherent electron beam energy modulations
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Carlo Spezzani, Giuseppe Penco, S. Di Mitri, M. B. Danailov, G. De Ninno, Marco Veronese, M. Trovo, Erik Hemsing, Enrico Allaria, Paolo Cinquegrana, Simone Spampinati, Luca Giannessi, L. Badano, Eléonore Roussel, G. Perosa, Najmeh Mirian, Primoz Rebernik Ribič, Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Mirian, N. S., Perosa, G., Hemsing, E., Allaria, E., Badano, L., Cinquegrana, P., Danailov, M. B., De Ninno, G., Giannessi, L., Penco, G., Spampinati, S., Spezzani, C., Roussel, E., Ribič, P. R., Trovó, M., Veronese, M., and Di Mitri, S.
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Accelerator Physics (physics.acc-ph) ,Nuclear and High Energy Physics ,Brightness ,Physics and Astronomy (miscellaneous) ,[PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph] ,Echo Enabled Harmonic Generation ,Microbunching Instability ,FOS: Physical sciences ,QC770-798 ,Photon energy ,01 natural sciences ,7. Clean energy ,law.invention ,Optics ,law ,Nuclear and particle physics. Atomic energy. Radioactivity ,0103 physical sciences ,High harmonic generation ,ddc:530 ,Harmonic number ,010306 general physics ,Physics ,010308 nuclear & particles physics ,business.industry ,Free-electron laser ,Surfaces and Interfaces ,Laser ,Wavelength ,Cathode ray ,Physics::Accelerator Physics ,Physics - Accelerator Physics ,business - Abstract
Physical review accelerators and beams 24(8), 080702 (2021). doi:10.1103/PhysRevAccelBeams.24.080702, Echo-enabled harmonic generation free-electron lasers (EEHG FELs)are promising candidates to produce fully coherent soft x-ray pulses by virtue of efficient high harmonic frequency up-conversion from UV lasers.The ultimate spectral limit of EEHG, however, remains unclear, because of the broadening and distortions induced in the output spectrum by residual broadband energy modulations in the electron beam. We present a mathematical description of the impact of incoherent(broadband) energy modulations on the bunching spectrum produced by the microbunching instability through both the accelerator and the EEHG line. The model is in agreementwith a systematic experimental characterization of the FERMI EEHGFEL in the photon energy range $130-210$ eV. We find that amplification of electron beam energy distortions primarily in the EEHG dispersive sections explains an observed reductionof the FEL spectral brightness that is proportional to the EEHGharmonic number. Local maxima of the FEL spectral brightness and of the spectralstability are found for a suitable balance of the dispersive sections'strength and the first seed laser pulse energy. Such characterizationprovides a benchmark for user experiments and future EEHG implementations designed to reach shorter wavelengths., Published by American Physical Society, College Park, MD
- Published
- 2021
107. Linear optics control of sideband instability for improved free-electron laser spectral brightness
- Author
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Marco Veronese, Giuseppe Penco, G. Perosa, Najmeh Mirian, M. B. Danailov, S. Di Mitri, Simone Spampinati, Paolo Cinquegrana, Eléonore Roussel, Paolo Sigalotti, L. Badano, Enrico Allaria, Niky Bruchon, Luca Giannessi, P. Rebernik, M. Trovo, G. De Ninno, Alexander Demidovich, Elettra Sincrotrone Trieste, ENEA C.R. Frascati, Via E. Fermi, 45, 00044 Frascati, Roma, Italy, affiliation inconnue, DYnamique des Systèmes COmplexes (DYSCO), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM], Perosa, G., Allaria, E. M., Badano, L., Bruchon, N., Cinquegrana, P., Danailov, M. B., Demidovich, A., De Ninno, G., Giannessi, L., Mirian, N., Penco, G. M., Rebernik, P., Roussel, E., Sigalotti, P., Spampinati, S., Veronese, M., Trovo, M., and Di Mitri, S.
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Nuclear and High Energy Physics ,Brightness ,Physics and Astronomy (miscellaneous) ,[PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph] ,01 natural sciences ,law.invention ,Optics ,law ,sidebands ,0103 physical sciences ,High harmonic generation ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,010306 general physics ,Quadrupole magnet ,FEL ,[PHYS]Physics [physics] ,Physics ,Synchrotron Radiation and Free-Electron Lasers ,010308 nuclear & particles physics ,business.industry ,Free-electron laser ,Surfaces and Interfaces ,Undulator ,Laser ,Modulational instability ,Spectral brilliance ,lcsh:QC770-798 ,Physics::Accelerator Physics ,business ,Coherence (physics) - Abstract
International audience; Extension of stable longitudinal coherence from vacuum ultraviolet to x rays is highly sought after in the free-electron laser (FEL) community, but it is often prevented by bandwidth broadening originated in the electron beam microbunching instability. We demonstrate that a proper tuning of the linear optics before the beam enters the undulator mitigates the microbunching-induced sideband instability. The experiment was conducted at the Fermi FEL operated in echo-enabled harmonic generation mode, where the spectral brightness at 7 nm wavelength was doubled. The FEL performance is compared to nonoptimized optics solutions and characterized in terms of peak intensity and spectral bandwidth shot-to-shot stability. The technique has straightforward implementation, because it uses quadrupole magnets routinely adopted for beam transport, and it applies to any FEL architecture, so paving the way to the production of high-intensity Fourier-transform limited x-ray pulses in existing and planned FEL facilities.
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- 2020
108. The FERMI free-electron lasers
- Author
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Allaria E., Badano L., Bassanese S., Capotondi F., Castronovo D., Cinquegrana P., Danailov M.B., D'Auria G., Demidovich A., De Monte R., De Ninno G., Di Mitri S., Diviacco B., Fawley W.M., Ferianis M., Ferrari E., Gaio G., Gauthier D., Giannessi L., Iazzourene F., Kurdi G., Mahne N., Nikolov I., Parmigiani F., Penco G., Raimondi L., Rebernik P., Rossi F., Roussel E., Scafuri C., Serpico C., Sigalotti P., Spezzani C., Svandrlik M., Svetina C., Trovo M., Veronese M., Zangrando D., Zangrando M., Giannessi, L., Allaria, E, Badano, L., Bassanese, S., Capotondi, Flavio, Castronovo, D., Cinquegrana, Paolo, Danailov, M. B., D'Auria, G., Demidovich, A., De Monte, R., DE NINNO, Giovanni, DI MITRI, Simone, Diviacco, Bruno, Fawley, W. M., Ferianis, M., Ferrari, Eugenio, Gaio, G., Gauthier, D., Iazzourene, F., Kurdi, G., Mahne, N., Nikolov, I., Parmigiani, Fulvio, Penco, G., Raimondi, L., Rebernik, P., Rossi, F., Roussel, E., Scafuri, C., Serpico, Claudio, Sigalotti, P., Spezzani, C., Svandrlik, M., Svetina, Cristian, Trovò, Mauro, Veronese, M., Zangrando, D., and Zangrando, M.
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Nuclear and High Energy Physics ,Extreme ultraviolet lithography ,02 engineering and technology ,Radiation ,01 natural sciences ,law.invention ,Optics ,free-electron laser ,law ,0103 physical sciences ,010306 general physics ,coherence Special issue on X-ray Free-Electron Laser ,Instrumentation ,Nuclear and High Energy Physic ,Physics ,coherence Special issue on X-ray Free-Electron Lasers ,lasers ,free-electron lasers ,business.industry ,Wavelength range ,Free-electron laser ,021001 nanoscience & nanotechnology ,Laser ,laser ,Extreme ultraviolet ,Optoelectronics ,0210 nano-technology ,business ,Coherence (physics) ,Fermi Gamma-ray Space Telescope - Abstract
FERMI is a seeded free-electron laser (FEL) facility located at the Elettra laboratory in Trieste, Italy, and is now in user operation with its first FEL line, FEL-1, covering the wavelength range between 100 and 20 nm. The second FEL line, FEL-2, a high-gain harmonic generation double-stage cascade covering the wavelength range 20–4 nm, has also completed commissioning and the first user call has been recently opened. An overview of the typical operating modes of the facility is presented.
- Published
- 2015
109. Determining the polarization state of an extreme ultraviolet free-electron laser beam using atomic circular dichroism
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R. Ivanov, Markus Ilchen, A. J. Rafipoor, Y. Ovcharenko, Oksana Plekan, Frank Stienkemeier, M. Devetta, Carlo Callegari, Andrey K. Kazansky, Miltcho B. Danailov, Alexander Demidovich, Marcello Coreno, Cesare Grazioli, K. Ueda, Tommaso Mazza, Kevin C. Prince, Cristian Svetina, Robert Richter, Paola Bolognesi, Nikolay M. Kabachnik, Lorenzo Avaldi, Patrick O'Keeffe, Paola Finetti, M. Di Fraia, Lorenzo Raimondi, John Costello, V. Lyamayev, Nicola Mahne, T. Möller, G. De Ninno, S. Düsterer, Michael Meyer, Mazza, T., Ilchen, M., Rafipoor, A. J., Callegari, C., Finetti, P., Plekan, O., Prince, K. C., Richter, R., Danailov, M. B., Demidovich, A., De Ninno, G., Grazioli, C., Ivanov, R., Mahne, N., Raimondi, L., Svetina, C., Avaldi, L., Bolognesi, P., Coreno, M., O'Keeffe, P., DI FRAIA, Michele, Devetta, M., Ovcharenko, Y., Möller, T. h., Lyamayev, V., Stienkemeier, F., Düsterer, S., Ueda, K., Costello, J. T., Kazansky, A. K., Kabachnik, N. M., and Meyer, M.
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electron ,Photon ,ultrafast phenomena ,Physics::Optics ,General Physics and Astronomy ,General Biochemistry, Genetics and Molecular Biology ,FERMI ,law.invention ,Optics ,law ,Physics ,Wavefront ,FEL ,polarization ,Multidisciplinary ,business.industry ,Free-electron laser ,General Chemistry ,Laser ,Polarization (waves) ,laser ,circular dichroism ,Extreme ultraviolet ,Optoelectronics ,business ,Ultrashort pulse ,Fermi Gamma-ray Space Telescope - Abstract
Ultrafast extreme ultraviolet and X-ray free-electron lasers are set to revolutionize many domains such as bio-photonics and materials science, in a manner similar to optical lasers over the past two decades. Although their number will grow steadily over the coming decade, their complete characterization remains an elusive goal. This represents a significant barrier to their wider adoption and hence to the full realization of their potential in modern photon sciences. Although a great deal of progress has been made on temporal characterization and wavefront measurements at ultrahigh extreme ultraviolet and X-ray intensities, only few, if any progress on accurately measuring other key parameters such as the state of polarization has emerged. Here we show that by combining ultra-short extreme ultraviolet free electron laser pulses from FERMI with near-infrared laser pulses, we can accurately measure the polarization state of a free electron laser beam in an elegant, non-invasive and straightforward manner using circular dichroism. © 2014 Macmillan Publishers Limited.
- Published
- 2014
110. Laser heater commissioning at an externally seeded free-electron laser
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S. Bassanese, M. Dal Forno, M. Trovo, Simone Spampinati, S. Di Mitri, D. Castronovo, M. B. Danailov, Lars Fröhlich, Enrico Allaria, C. Serpico, Eugenio Ferrari, Marco Veronese, Luigi P. Badano, M. Svandrlik, Alexander Demidovich, Bruno Diviacco, Giuseppe Penco, Luca Giannessi, Sandra Biedron, W. M. Fawley, Paolo Craievich, Stephen V. Milton, Carlo Spezzani, G. De Ninno, Giulio Gaio, Spampinati, S., Allaria, E., Badano, L., Bassanese, S., Biedron, S., Castronovo, D., Craievich, P., Danailov, M. B., Demidovich, A., DE NINNO, Giovanni, Di Mitri, S., Diviacco, B., DAL FORNO, Massimo, Ferrari, Eugenio, Fawley, W. M., Fröhlich, L., Gaio, G., Giannessi, L., Penco, G., Serpico, C., Spezzani, C., Trovò, M., Veronese, M., Milton, S. V., and Svandrlik, M.
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Physics ,Brightness ,Nuclear and High Energy Physics ,Physics and Astronomy (miscellaneous) ,business.industry ,Astrophysics::High Energy Astrophysical Phenomena ,Free-electron laser ,Surfaces and Interfaces ,Radiation ,Laser ,Linear particle accelerator ,law.invention ,Nuclear physics ,Optics ,law ,Extreme ultraviolet ,Cathode ray ,Physics::Accelerator Physics ,lcsh:QC770-798 ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,business ,Surfaces and Interface ,Fermi Gamma-ray Space Telescope - Abstract
FERMI is the first user facility based upon an externally seeded free-electron laser (FEL) and was designed to deliver high quality, transversely and longitudinally coherent radiation pulses in the extreme ultraviolet and soft x-ray spectral regimes. The FERMI linear accelerator includes a laser heater to control the longitudinal microbunching instability, which otherwise is expected to degrade the quality of the high brightness electron beam sufficiently to reduce the FEL output intensity and spectral brightness. In this paper, we present the results of the FERMI laser heater commissioning. For the first time, we show that optimizing the electron beam heating at an upstream location (beam energy, 100 MeV) leads to a reduction of the incoherent energy spread at the linac exit (beam energy, 1.2 GeV). We also discuss some of the positive effects of such heating upon the emission of coherent optical transition radiation and the FEL output intensity.
- Published
- 2014
111. Two-colour pump–probe experiments with a twin-pulse-seed extreme ultraviolet free-electron laser
- Author
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Emanuele Pedersoli, Cristian Svetina, Simone Spampinati, Paolo Sigalotti, Roberto Borghes, Paolo Cinquegrana, C. Serpico, Lorenzo Raimondi, David Gauthier, Flavio Capotondi, P. Charalambous, G. Kurdi, L. Froehlich, R. Ivanov, Ivaylo Nikolov, Carlo Spezzani, Filippo Bencivenga, Nicola Mahne, Miltcho B. Danailov, Alexander Demidovich, Benoît Mahieu, Eugenio Ferrari, Giuseppe Penco, Bruno Diviacco, Luca Giannessi, G. De Ninno, Marco Zangrando, Mauro Trovò, Enrico Allaria, Alessandro Gessini, S. Di Mitri, D. Castronovo, W. M. Fawley, Maya Kiskinova, Claudio Masciovecchio, Daniele Fausti, Sincrotrone Trieste, NEST-INFM (INFM), National Institute for Nuclear Physics (INFN), School of Applied Sciences, University of Nova Gorica, Techniques of Informatics and Microelectronics for integrated systems Architecture (TIMA), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Italian National agency for new technologies, Energy and sustainable economic development [Frascati] (ENEA), Elettra Sincrotrone Trieste, Laboratoire d'optique appliquée (LOA), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-École Nationale Supérieure de Techniques Avancées (ENSTA Paris), CNR Istituto Officina dei Materiali (IOM), Consiglio Nazionale delle Ricerche [Roma] (CNR), Istituto Nazionale di Fisica Nucleare (INFN), Techniques de l'Informatique et de la Microélectronique pour l'Architecture des systèmes intégrés (TIMA), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Allaria, E., Bencivenga, F., Borghes, R., Capotondi, Flavio, Castronovo, D., Charalambous, P., Cinquegrana, Paolo, Danailov, M. B., DE NINNO, Giovanni, Demidovich, A., Di Mitri, S., Diviacco, B., Fausti, Daniele, Fawley, W. M., Ferrari, Eugenio, Froehlich, L., Gauthier, D., Gessini, A., Giannessi, L., Ivanov, R., Kiskinova, Maya, Kurdi, G., Mahieu, B., Mahne, N., Nikolov, I., Masciovecchio, C., Pedersoli, E., Penco, G., Raimondi, L., Serpico, Claudio, Sigalotti, P., Spampinati, S., Spezzani, C., Svetina, Cristian, Trovò, Mauro, and Zangrando, M.
- Subjects
Diffraction ,Genetics and Molecular Biology (all) ,[PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph] ,General Physics and Astronomy ,Nanotechnology ,01 natural sciences ,Biochemistry ,Article ,General Biochemistry, Genetics and Molecular Biology ,010305 fluids & plasmas ,law.invention ,Physics and Astronomy (all) ,Optics ,law ,0103 physical sciences ,High harmonic generation ,010306 general physics ,Physics ,[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] ,Biochemistry, Genetics and Molecular Biology (all) ,Multidisciplinary ,[PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph] ,business.industry ,Chemistry (all) ,Free-electron laser ,Time evolution ,General Chemistry ,Laser ,3. Good health ,Pulse (physics) ,Extreme ultraviolet ,State of matter ,business - Abstract
Exploring the dynamics of matter driven to extreme non-equilibrium states by an intense ultrashort X-ray pulse is becoming reality, thanks to the advent of free-electron laser technology that allows development of different schemes for probing the response at variable time delay with a second pulse. Here we report the generation of two-colour extreme ultraviolet pulses of controlled wavelengths, intensity and timing by seeding of high-gain harmonic generation free-electron laser with multiple independent laser pulses. The potential of this new scheme is demonstrated by the time evolution of a titanium-grating diffraction pattern, tuning the two coherent pulses to the titanium M-resonance and varying their intensities. This reveals that an intense pulse induces abrupt pattern changes on a time scale shorter than hydrodynamic expansion and ablation. This result exemplifies the essential capabilities of the jitter-free multiple-colour free-electron laser pulse sequences to study evolving states of matter with element sensitivity., Free-electron lasers are a powerful new tool for studying properties and transient states of matter. Here, the authors use a novel seed scheme for generation of two XUV laser pulses of controlled wavelength and time separation that enables access to ultrafast phenomena with elemental sensitivity.
- Published
- 2013
112. Tunability experiments at the FERMI@Elettra free-electron laser
- Author
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Roberto Gunnella, Roberto Borghes, Erika Giangrisostomi, Enrico Allaria, Ivaylo Nikolov, Adriano Filipponi, M. Di Fraia, Claudio Masciovecchio, Luca Giannessi, Marco Zangrando, W. M. Fawley, Riccardo Cucini, M. Trovo, Filippo Bencivenga, S. Di Mitri, Flavio Capotondi, Giuseppe Penco, Carlo Spezzani, L. Froehlich, Francesco D'Amico, D. Castronovo, S. Di Fonzo, R. Ivanov, Benoît Mahieu, Cristian Svetina, Carlo Callegari, Miltcho B. Danailov, Alessandro Gessini, Marcello Coreno, Lorenzo Raimondi, G. De Ninno, Dario Giuressi, R. Sergo, A. Di Cicco, Daniele Cocco, Bruno Diviacco, Cesare Grazioli, Andrea Battistoni, Alexander Demidovich, Eugenio Ferrari, Emiliano Principi, Paolo Craievich, Paolo Cinquegrana, G. Passos, Nicola Mahne, Emanuele Pedersoli, Paolo Sigalotti, Allaria, E., Battistoni, Andrea, Bencivenga, F., Borghes, R., Callegari, C., Capotondi, F., Castronovo, D., Cinquegrana, P., Cocco, D., Coreno, M., Craievich, P., Cucini, R., D'Amico, F., Danailov, M. B., Demidovich, A., De Ninno, G., Di Cicco, A., Di Fonzo, S., DI FRAIA, Michele, Di Mitri, S., Diviacco, B., Fawley, W. M., Ferrari, Eugenio, Filipponi, A., Froehlich, L., Gessini, A., Giangrisostomi, Erika, Giannessi, L., Giuressi, D., Grazioli, Cesare, Gunnella, R., Ivanov, R., Mahieu, B., Mahne, N., Masciovecchio, C., Nikolov, I. P., Passos, G., Pedersoli, E., Penco, G., Principi, E., Raimondi, L., Sergo, R., Sigalotti, P., Spezzani, C., Svetina, Cristian, Trovò, M., and Zangrando, M.
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FEL ,seeded ,tunability ,TIMEX ,DIPROI ,LDM ,Fermi ,Extreme ultraviolet lithography ,General Physics and Astronomy ,02 engineering and technology ,7. Clean energy ,01 natural sciences ,Thermopile ,law.invention ,symbols.namesake ,Optics ,law ,0103 physical sciences ,010306 general physics ,Physics ,business.industry ,Free-electron laser ,021001 nanoscience & nanotechnology ,Laser ,Wavelength ,Fourier transform ,Absorption edge ,symbols ,RADIATION ,0210 nano-technology ,business ,Coherence (physics) - Abstract
FERMI@Elettra is a free electron-laser (FEL)-based user facility that, after two years of commissioning, started preliminary users' dedicated runs in 2011. At variance with other FEL user facilities, FERMI@Elettra has been designed to deliver improved spectral stability and longitudinal coherence. The adopted scheme, which uses an external laser to initiate the FEL process, has been demonstrated to be capable of generating FEL pulses close to the Fourier transform limit. We report on the first instance of FEL wavelength tuning, both in a narrow and in a large spectral range (fine- and coarse-tuning). We also report on two different experiments that have been performed exploiting such FEL tuning. We used fine-tuning to scan across the 1s–4p resonance in He atoms, at ≈23.74 eV (52.2 nm), detecting both UV–visible fluorescence (4p–2s, 400 nm) and EUV fluorescence (4p–1s, 52.2 nm). We used coarse-tuning to scan the M4,5 absorption edge of Ge (∼29.5 eV) in the wavelength region 30–60 nm, measured in transmission geometry with a thermopile positioned on the rear side of a Ge thin foil.
- Published
- 2012
113. Magnetization and microstructure dynamics in Fe/MnAs/GaAs(001): Fe magnetization reversal by a femtosecond laser pulse.
- Author
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Spezzani C, Ferrari E, Allaria E, Vidal F, Ciavardini A, Delaunay R, Capotondi F, Pedersoli E, Coreno M, Svetina C, Raimondi L, Zangrando M, Ivanov R, Nikolov I, Demidovich A, Danailov MB, Popescu H, Eddrief M, De Ninno G, Kiskinova M, and Sacchi M
- Abstract
Thin film magnetization reversal without applying external fields is an attractive perspective for applications in sensors and devices. One way to accomplish it is by fine-tuning the microstructure of a magnetic substrate via temperature control, as in the case of a thin Fe layer deposited on a MnAs/GaAs(001) template. This work reports a time-resolved resonant scattering study exploring the magnetic and structural properties of the Fe/MnAs system, using a 100 fs optical laser pulse to trigger local temperature variations and a 100 fs x-ray free-electron laser pulse to probe the induced magnetic and structural dynamics. The experiment provides direct evidence that a single optical laser pulse can reverse the Fe magnetization locally. It reveals that the time scale of the magnetization reversal is slower than that of the MnAs structural transformations triggered by the optical pulse, which take place after a few picoseconds already.
- Published
- 2014
- Full Text
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