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    Wyświetlanie 1-4 z 4
    Tytuł:
    Studies of plasma and craters produced by the interaction of high-energy sub-nanosecond laser with silver target
    Autorzy:
    Woryna, E.
    Badziak, J.
    Parys, P.
    Suchańska, R.
    Wołowski, J.
    Krása, J.
    Láska, L.
    Pfeifer, M.
    Rohlena, K.
    Ullschmied, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147102.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    ion beam
    laser
    laser-induced crater
    plasma
    Opis:
    The results of measurements of microablation from a silver target irradiated by the high-power PALS laser system in Prague are presented. In this experiment the laser beam of energy of about 110 J in a 400 ps pulse was focused perpendicularly to the massive silver target. The target surface position was changed with respect to the focal spot of the laser beam in the range from -2.5 to 2.5 mm. A set of four ion collectors was used for plasma ion emission measurements. The effect of the laser pulse interaction with the target, i.e. craters and damages formed in the vicinity of the craters, were investigated with the use of scanning electron microscopy (SEM) and optical microscopy methods. The characteristics of the crater were compared with the essential parameters of ion streams emitted from the plasma produced in the same laser shot.
    Źródło:
    Nukleonika; 2002, 47, 4; 147-150
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and theoretical investigations of crater formation in an aluminium target in a PALS experiment
    Autorzy:
    Borodziuk, S.
    Doskach, I.
    Gus'kov, S.
    Jungwirth, K.
    Kálal, M.
    Kasperczuk, A.
    Kralikova, B.
    Krousky, E.
    Limpouch, J.
    Masek, K.
    Pfeifer, M.
    Pisarczyk, P.
    Pisarczyk, T.
    Rohlena, K.
    Rozanov, V.
    Skala, J.
    Ullschmied, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147967.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    laser-produced plasma
    crater
    absorption of laser radiation
    resonance mechanism
    inverse bremsstrahlung
    interferometry
    fast electrons
    Opis:
    Experimental and theoretical results of investigations of the iodine laser - Al solid target interactions on the PALS (Prague Asterix Laser System) facility are presented. The experimental investigations of laser interaction with massive Al targets devoted to shock wave propagation in solids and crater formation physics are presented. Experiments were performed with the use of high intensity laser pulses (1013 15 W/cm2) for two laser wavelengths (0.438 mi m and 1.315 mi m) and four laser beam radii (from 35 mi m up to 600 ěm). The crater dimensions were measured using optical microscopy and a wax-replica technique. Plasma expansion out of the target was measured via three-frame interferometry. Theoretical model of the postpulse crater formation by the shock wave propagating and decaying in solids after the end of the laser pulse is presented and applied for the explanation of the results obtained in experiments.
    Źródło:
    Nukleonika; 2004, 49, 1; 7-14
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electromagnetic pulses produced by expanding laser - produced Au plasma
    Autorzy:
    De Marco, M.
    Cikhardt, J.
    Krása, J.
    Velyhan, A.
    Pfeifer, M.
    Krouský, E.
    Klír, D.
    Řezáč, D.
    Limpouch, J.
    Margarone, D.
    Ullschmied, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147922.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    laser-produced plasma
    electromagnetic pulse (EMP)
    return target current
    Moebius loop antenna
    inductive target probe
    Opis:
    The interaction of an intense laser pulse with a solid target produces large number of fast free electrons. This emission gives rise to two distinct sources of the electromagnetic pulse (EMP): the pulsed return current through the holder of the target and the out flow of electrons into the vacuum. A relation between the characteristics of laser-produced plasma, the target return current and the EMP emission are presented in the case of a massive Au target irradiated with the intensity of up to 3 × 1016 W/cm2. The emission of the EMP was recorded using a 12 cm diameter Moebius loop antennas, and the target return current was measured using a new type of inductive target probe (T-probe). The simultaneous use of the inductive target probe and the Moebius loop antenna represents a new useful way of diagnosing the laser–matter interaction, which was employed to distinguish between laser-generated ion sources driven by low and high contrast laser pulses.
    Źródło:
    Nukleonika; 2015, 60, 2; 239-243
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-energy ion implantation from high-intensity laser
    Autorzy:
    Cutroneo, M.
    Torrisi, L.
    Ullschmied, J.
    Dudzak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/146359.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    high-intensity laser
    implantation
    material modification
    Opis:
    The laser-matter interaction using nominal laser intensity above 1015 W/cm2 generates in vacuum non- -equilibrium plasmas accelerating ions at energies from tens keV up to hundreds MeV. From thin targets, using the TNSA regime, plasma is generated in the forward direction accelerating ions above 1 MeV per charge state and inducing high-ionization states. Generally, the ion energies follow a Boltzmann-like distribution characterized by a cutoff at high energy and by a Coulomb-shift towards high energy increasing the ion charge state. The accelerated ions are emitted with the high directivity, depending on the ion charge state and ion mass, along the normal to the target surface. The ion fluencies depend on the ablated mass by laser, indeed it is low for thin targets. Ions accelerated from plasma can be implanted on different substrates such as Si crystals, glassy-carbon and polymers at different fluences. The ion dose increment of implanted substrates is obtainable with repetitive laser shots and with repetitive plasma emissions. Ion beam analytical methods (IBA), such as Rutherford backscattering spectroscopy (RBS), elastic recoil detection analysis (ERDA) and proton-induced X-ray emission (PIXE) can be employed to analyse the implanted species in the substrates. Such analyses represent ‘off-line’ methods to extrapolate and to character the plasma ion stream emission as well as to investigate the chemical and physical modifications of the implanted surface. The multi-energy and species ion implantation from plasma, at high fluency, changes the physical and chemical properties of the implanted substrates, in fact, many parameters, such as morphology, hardness, optical and mechanical properties, wetting ability and nanostructure generation may be modified through the thermal-assisted implantation by multi-energy ions from laser-generated plasma.
    Źródło:
    Nukleonika; 2016, 61, 2; 109-113
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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