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Now showing items 1 - 8 of 8

  • X-ray phase-contrast imaging for laser-induced shock waves

    Antonelli, L.   Barbato, F.   Mancelli, D.   Trela, J.   Zeraouli, G.   Boutoux, G.   Neumayer, P.   Atzeni, S.   Schiavi, A.   Volpe, L.   Bagnoud, V.   Brabetz, C.   Zielbauer, B.   Bradford, P.   Woolsey, N.   Borm, B.   Batani, D.  

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  • Propagation-based imaging phase-contrast enhanced imaging setup for single shot acquisition using laser-generated X-ray sources

    Barbato, F.   Batani, D.   Mancelli, D.   Trela, J.   Zeraouli, G.   Boutoux, G.   Neumayer, P.   Atzeni, S.   Schiavi, A.   Volpe, L.   Bagnoud, V.   Brabetz, C.   Zielbauer, B.   Bradford, P.   Woolsey, N.   Borm, B.   Antonelli, L.  

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  • Generation of high energy laser-driven electron and proton sources with the 200 TW system VEGA 2 at the Centro de Laseres Pulsados

    Volpe, L.   Fedosejevs, R.   Gatti, G.   Pérez-Hernández, J. A.   Méndez, C.   Apiñaniz, J.   Vaisseau, X.   Salgado, C.   Huault, M.   Malko, S.   Zeraouli, G.   Ospina, V.   Longman, A.   De Luis, D.   Li, K.   Varela, O.   García, E.   Hernández, I.   Pisonero, J. D.   García Ajates, J.   Alvarez, J. M.   García, C.   Rico, M.   Arana, D.   Hernández-Toro, J.   Roso, L.  

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  • Propagation-based imaging phase-contrast enhanced imaging setup for single shot acquisition using laser-generated X-ray sources

    Barbato, F.   Batani, D.   Mancelli, D.   Trela, J.   Zeraouli, G.   Boutoux, G.   Neumayer, P.   Atzeni, S.   Schiavi, A.   Volpe, L.   Bagnoud, V.   Brabetz, C.   Zielbauer, B.   Bradford, P.   Woolsey, N.   Borm, B.   Antonelli, L.  

    The development of new diagnostics is important to improve the interpretation of experiments. Often well-known physical processes and techniques originally developed in unrelated fields of science can be applied to a different area with a significant impact on the quality of the produced data. X-ray phase-contrast imaging (XPCI) is one techniques which has found many applications in biology and medicine. This is due to its capability to emphasise the presence of strong density variations normally oriented with respect to the X-ray propagation direction. With the availability of short energetic X-ray pulses XPCI extends to time-resolved pump-probe measurements of laser-matter interaction where strong density gradient are also present. In this work we present the setup for XPCI tested at the laser PHELiX at GSI in Germany.
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  • X-ray phase-contrast imaging for laser-induced shock waves

    Antonelli, L.   Barbato, F.   Mancelli, D.   Trela, J.   Zeraouli, G.   Boutoux, G.   Neumayer, P.   Atzeni, S.   Schiavi, A.   Volpe, L.   Bagnoud, V   Brabetz, C.   Zielbauer, B.   Bradford, P.   Woolsey, N.   Borm, B.   Batani, D.  

    X-ray phase-contrast imaging (XPCI) is a versatile technique with applications in many fields, including fundamental physics, biology and medicine. Where X-ray absorption radiography requires high density ratios for effective imaging, the image contrast for XPCI is a function of the density gradient. In this letter, we apply XPCI to the study of laser-driven shock waves. Our experiment was conducted at the Petawatt High-Energy Laser for Heavy Ion EXperiments (PHELIX) at GSI. Two laser beams were used: one to launch a shock wave and the other to generate an X-ray source for phase-contrast imaging. Our results suggest that this technique is suitable for the study of warm dense matter (WDM), inertial confinement fusion (ICF) and laboratory astrophysics. Copyright (C) EPLA, 2019
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  • Generation of high energy laser-driven electron and proton sources with the 200 TW system VEGA 2 at the Centro de Laseres Pulsados

    Volpe, L.   Fedosejevs, R.   Gatti, G.   Perez-Hernandez, J. A.   Mendez, C.   Apinaniz, J.   Vaisseau, X.   Salgado, C.   Huault, M.   Malko, S.   Zeraouli, G.   Spina, V   Longman, A.   De Luis, D.   Li, K.   Varela, O.   Garcia, E.   Hernandez, I   Pisonero, J. D.   Garcia Ajates, J.   Alvarez, J. M.   Garcia, C.   Rico, M.   Arana, D.   Hernandez-Toro, J.   Roso, L.  

    The Centro de Laseres Pulsados in Salamanca, Spain has recently started operation phase and the first user access period on the 6 J 30 fs 200 TW system (VEGA 2) already started at the beginning of 2018. In this paper we report on two commissioning experiments recently performed on the VEGA 2 system in preparation for the user campaign. VEGA 2 system has been tested in different configurations depending on the focusing optics and targets used. One configuration (long focal length F =3D 130 cm) is for underdense laser-matter interaction where VEGA 2 is focused onto a low density gas-jet generating electron beams (via laser wake field acceleration mechanism) with maximum energy up to 500 MeV and an X-ray betatron source with a 10 keV critical energy. A second configuration (short focal length F =3D 40 cm) is for overdense laser-matter interaction where VEGA 2 is focused onto a 5 mu m thick Al target generating a proton beam with a maximum energy of 10 MeV and temperature of 2.5 MeV. In this paper we present preliminary experimental results.
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  • Development of an adjustable Kirkpatrick-Baez microscope for laser driven x-ray sources

    Zeraouli, G.   Gatti, G.   Longman, A.   Perez-Hernandez, J. A.   Arana, D.   Batani, D.   Jakubowska, K.   Volpe, L.   Roso, L.   Fedosejevs, R.  

    A prototype of a highly adjustable Kirkpatrick-Baez (KB) microscope has been designed, built, and tested in a number of laser driven x-ray experiments using the high power (200 TW) VEGA-2 laser system of the Spanish Centre for Pulsed Lasers (CLPU). The presented KB version consists of two, perpendicularly mounted, 500 mu m thick silicon wafers, coated with a layer of platinum, a few tens of nanometers thick. Unlike the usual millimeter thick glass substrate, this design allows for a larger bending flexibility and large adjustment range. According to simulations, this KB microscope offers broadband multikiloelectron volt reflection spectra (1 eV-20 keV), allowing more spectral tunability than conventional Bragg crystals. In addition to be vacuum compatible, this prototype is characterized by a relatively small size (21 cm x 31 cm x 27 cm) and permits remote control and modification both of the radii of curvature (down to 10 m) and of the grazing incidence angle (up to 60 mrad). A few examples of focusing performance tests and experimental results are discussed.
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  • Soft X-ray measurements with a gas detector coupled to microchips in laser-plasma experiments at VEGA-2

    Claps, G.   Cordella, F.   Pacella, D.   Romano, A.   Murtas, F.   Batani, D.   Turianska, O.   Raffestin, D.   Volpe, L.   Zeraouli, G.   Perez-Hernandez, J. A.   Malko, S.  

    This work presents an innovative usage of the GEMpix detector for soft X-rays (SXR) measurements aimed to make an estimate of the electron temperature of a Laser Produced Plasma (LPP). The GEMpix is a proportional gas detector based on three Gas Electron Multipliers (GEMs) with a Front-End Electronics (FEE) based on four Timepix chips. This FEE provides the Time over Threshold (ToT) acquisition mode pixel by pixel and then a digital measure of the released charge in the gas mixture. In addition, the charge can be amplified through the GEM foils with 4 orders of magnitude spanning gain offering, in this way, a big dynamic range and adjustable sensitivity. Chip design provides a threshold for each channel. All the thresholds are set in order to cut electronic noise and detect X-rays. In this configuration, a cut on the low amplitude signals is set, but the gain has been tuned in order to observe the main signal due to the soft X-rays reaching the detector. This detector works in an energy range between 2 to 15 keV. It offers good imaging properties, high efficiency and absolute calibration. It offers a good immunity to Electromagnetic Pulse (EMP), as checked at VEGA-2 laser facility (hundreds of TWin about 30 fs). In these experiments, where the formation of warm dense matter produced by blast waves has been studied, a measure of the plasma temperature was required. This measurement was realized applying some filters on the active area of the detector, in correspondence of three chips. With this configuration a study of the GEMpix response due to the photons coming from the coronal plasma produced by the laser on the target has been done for each single shot. GEMpix revealed innovative and attractive features, compared to the state of the art where passive films or detectors based on indirect conversion are used, for SXR imaging and spectral analysis to infer the electron temperature.
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