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    Wyświetlanie 1-46 z 46
    Tytuł:
    Surface Modification of Solids by Extreme Ultraviolet and Plasma Treatment
    Autorzy:
    Bartnik, A.
    Fiedorowicz, H.
    Skrzeczanowski, W.
    Czwartos, J.
    Wachulak, P.
    Jarocki, R.
    Kostecki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030617.pdf
    Data publikacji:
    2018-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    laser plasma
    photoionized plasma
    surface treatment
    nanostructures
    Opis:
    In this paper, results of surface modification, using a laser-produced plasma source of extreme ultraviolet, and the extreme ultraviolet induced low temperature plasmas, are presented. It was shown that irradiation of different materials by intense extreme ultraviolet pulses results in strong changes of the surface morphology. Examples of micro- and nanostructures obtained this way are presented. It was also demonstrated that a dual action of the radiation pulses and low temperature plasmas allows to modify a molecular structure of exposed materials.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 2; 267-270
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of the propagation of intense laser pulses in gas for laser plasma acceleration
    Autorzy:
    Giulietti, D.
    Cecchetti, C. A.
    Drenska, N. V.
    Faccini, N.
    Gatti, C.
    Gatti, G.
    Giulietti, A.
    Gizzi, L.
    Labate, L.
    Levato, T.
    Martellotti, S.
    Pathak, N.
    Valente, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147890.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    intense laser pulses
    ultra-short laser pulse
    laser plasma
    plasma acceleration
    Opis:
    The role of the propagation mechanisms of intense and ultra-short laser pulses in gas is presented, as well as the first results of the laser plasma acceleration (LPA) tests at Frascati National Laboratories (INFN), in the frame of NTA-PLASMONX project.
    Źródło:
    Nukleonika; 2012, 57, 2; 221-225
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulations of generation of high-energy ion beams driven by a petawatt femtosecond laser
    Autorzy:
    Domański, J
    Badziak, J.
    Jabłoński, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/146458.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    laser acceleration
    laser plasma
    ions
    particle-in-cell simulations
    Opis:
    This contribution presents results of a Particle-in-Cell simulation of ion beam acceleration via the interaction of a petawatt 25 fs laser pulse of high intensity (up to ~1021 W/cm2) with thin hydrocarbon (CH) and erbium hydride (ErH3) targets of equal areal mass density (of 0.6 g/m2). A special attention is paid to the effect that the laser pulse polarization and the material composition of the target have on the maximum ion energies and the number of high energy (>10 MeV) protons. It is shown that both the mean and the maximum ion energies are higher for the linear polarization than for the circular one. A comparison of the maximum proton energies and the total number of protons generated from the CH and ErH3 targets using a linearly polarized beam is presented. For the ErH3 targets the maximum proton energies are higher and they reach 50 MeV for the laser pulse intensity of 1021 W/cm2. The number of protons with energies higher than 10 MeV is an order of magnitude higher for the ErH3 targets than that for the CH targets.
    Źródło:
    Nukleonika; 2015, 60, 2; 229-232
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Power Laser Laboratory at the Institute of Plasma Physics and Laser Microfusion : equipment and preliminary research
    Autorzy:
    Zaraś-Szydłowska, A.
    Badziak, J.
    Rosiński, M.
    Makowski, J.
    Parys, P.
    Piotrowski, M.
    Ryć, L.
    Wołowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146603.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    femtosecond pulses
    high-power laser
    inertial confinement fusion
    laser plasma
    Opis:
    The purpose of this paper is to present the newly-opened High Power Laser Laboratory (HPLL) at the Institute of Plasma Physics and Laser Microfusion (IPPLM). This article describes the laser, the main laboratory accessories and the diagnostic instruments. We also present preliminary results of the first experiment on ion and X-ray generation from laser-produced plasma that has been already performed at the HPLL.
    Źródło:
    Nukleonika; 2015, 60, 2; 245-248
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proton emission from laser - generated plasmas at different intensities
    Autorzy:
    Torrisi, L.
    Cutroneo, M.
    Cavallaro, S.
    Giuffrida, L.
    Margarone, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/146370.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    laser-generated plasma
    proton acceleration
    Opis:
    Proton acceleration from laser-generated plasma is carried out at intensities ranging between 1010 and 1019 W/cm2, by using ns, ps and fs laser systems. The high energy density transferred from the pulsed laser beam into the solid target generates ionized species released in vacuum from the solid surface. Fast electrons followed by slower ions build up a double-layer and a consequent electric field, which is responsible for the ion acceleration mainly along the target-normal. Polymeric targets containing nanostructures (or metallic species) with high laser absorbing capacity, and metallic hydrates (or H-enriched metals), permit to increase the plasma temperature and density, thus to improve the proton beam energy and current. Thick targets and low laser intensities, operating in repetitive pulse, allows to generate high currents of low energy protons. On the other hand, through the use of thin targets and high laser intensities enabled the generation of high proton energies, above 1 MeV.
    Źródło:
    Nukleonika; 2012, 57, 2; 237-240
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Post acceleration of ions emitted from laser and spark - generated plasmas
    Autorzy:
    Torrisi, L.
    Cavallaro, S.
    Rosiński, M.
    Nassisi, V.
    Paperny, V.
    Romanov, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146658.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    post ion acceleration
    laser plasma
    ion beam
    ion implantation
    Opis:
    Pulsed lasers at intensities of the order of 1010 W/cm2 interacting with solid matter in vacuum, produce hot plasmas at high temperatures and densities. The charge state distributions of the plasma generate a high electric field, which induces high ion acceleration along the normal to the target surface. The high yield of the emitted ions can generate a near constant current by using repetitive pulses irradiating thick targets. In order to increase ion energy, a post-acceleration system can be employed by using acceleration voltages above 10 kV. Special ion extraction methods can be employed to generate the final ion beam, which is multi-ionic and multi-energetic, due to the presence of different ion species and of different charge states. In this article four different methods of post ion acceleration, employed at the INFN-LNS of Catania, at the IPPLM of Warsaw, at the INFN of Lecce and at the LPI of Moscow, are presented, discussed and compared. All methods are able to implant ions in different substrates at different depth and at different dose-rates.
    Źródło:
    Nukleonika; 2012, 57, 3; 323-332
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of low-temperature plasmas formed in low-density gases surrounding laser-produced plasmas
    Autorzy:
    Majszyk, Mateusz
    Bartnik, Andrzej
    Skrzeczanowski, Wojciech
    Fok, Tomasz
    Węgrzyński, Łukasz
    Szczurek, Mirosław
    Fiedorowicz, Henryk
    Powiązania:
    https://bibliotekanauki.pl/articles/2202566.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    extreme ultraviolet
    EUV
    laser plasma
    low pressure
    photoionization
    plasma
    soft X-ray
    SXR
    Opis:
    Low-temperature plasma production is possible as a result of photoionization using high-intensity extreme ultraviolet (EUV) and soft X-ray (SXR) pulses. Plasma of this type is also present in outer space, e.g., aurora borealis. It also occurs when high-velocity objects enter the atmosphere, during which period high temperatures can be produced locally by friction. Low-temperature plasma is also formed in an ambient gas surrounding the hot laser-produced plasma (LPP). In this work, a special system has been prepared for investigation of this type of plasma. The LPP was created inside a chamber fi lled with a gas under a low pressure, of the order of 1–50 mbar, by a laser pulse (3–9 J, 1–8 ns) focused onto a gas puff target. In such a case, the SXR/EUV radiation emitted from the LPP was partially absorbed in the low-density gas. In this case, high- and low-temperature plasmas (Te ~100 eV and ~1 eV, respectively) were created locally in the chamber. Investigation of the EUV-induced plasmas was performed mainly using spectral methods in ultraviolet/visible (UV/VIS) light. The measurements were performed using an echelle spectrometer, and additionally, spatial–temporal measurements were performed using an optical streak camera. Spectral analysis was supported by the PGOPHER numerical code.
    Źródło:
    Nukleonika; 2023, 68, 1; 11--17
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Post-acceleration of ions from the laser-generated plasma
    Autorzy:
    Giuffrida, L.
    Torrisi, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/146664.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    laser ablation
    laser-plasma
    post-acceleration
    ion implantation
    Rutherford backscattering spectrometry (RBS) analysis
    Opis:
    An application of the laser-generated plasma for multi-energetic ion implantation is reported. In an experiment performed at Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud (INFN-LNS) of Catania, Italy the Nd:YAG laser was used, operating at the 1064 nm wavelength with the intensity of 1010 W/cm2. A laser pulse of 9 ns duration and 300 mJ energy was employed to ablate a solid target placed in a high vacuum. The free ion expansion occurred in a constant potential chamber placed at 30 kV positive voltage with respect to the ground, which allowed to extract ions with energy proportional to the charge state. In an another experiment, performed at the PALS Prague laser facility (1315 nm, 400 ps pulse width and the laser pulse energy delivered on target equal to about 35 J) Ti ions were obtained through the ablation of solid targets in vacuum by means of 1015 W/cm2 laser pulses. In both cases ion energy analyzers were used to measure the energy-to-charge ratio of the ions. The ion energy distribution was determined from the time-of-flight measurements. The depth profiles measured through Rutherford backscattering spectrometry (RBS) analysis are in good agreement with the ion energy analyzer spectroscopy measurements.
    Źródło:
    Nukleonika; 2011, 56, 2; 161-163
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser-induced ablation: physics and diagnostics of ion emission
    Autorzy:
    Torrisi, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/146624.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    laser-generating plasma
    Boltzmann distribution
    time-of-flight
    Opis:
    Pulsed lasers generating beams of different intensities may be used to produce ablation of solid targets placed in high vacuum and to generate pulsed plasma and ion acceleration. The plasma is in a non-equilibrium condition and in the first instant the particles being generated are subject to thermal interactions, to a supersonic gas expansion in vacuum and to a Coulomb acceleration due to the high electric field developed along the normal to the target surface. The ion diagnostics, based on time-of-flight technique, allow us to measure the mean ion energy, the total number of ions, as well as the ion energy and charge state distributions. The ion energy distributions may be described by the Coulomb- -Boltzmann-Shifted (CBS) function, which after fitting to the experimental data may be used to determine the equivalent ion temperature and the accelerating voltage. Given the equivalent acceleration voltage and the plasma Debye length, it is possible to estimate the magnitude of the electric field developed in the plasma. Measurements of the ablation yield, plasma dimension and optical spectroscopy allow us to calculate the atomic and electronic plasma density and to evaluate the coronal plasma temperature. Some applications of the laser-induced ablation consist in the realization of laser ion sources (LIS), generation of multi-energetic ion beams by using a post-accelerating voltage, use of ultra-intense fs lasers to accelerate ions to energies of the order of tens MeV/nucleon. Other special applications include the pulsed laser deposition (PLD) of thin films, the laser ablation coupled to mass quadrupole spectrometry (LAMQS) probes, ablation of biological tissues, and generation of plasma for astrophysical and nuclear investigations.
    Źródło:
    Nukleonika; 2011, 56, 2; 113-117
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pulsed laser induced potassium oxide plasma analyzed by optical emission spectrum technique
    Autorzy:
    Khalaf, Madyan A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193329.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Laser - Induced Plasma (LIP)
    Nd:YAG laser
    Optical Emission Spectroscopic
    potassium oxide plasma
    Opis:
    In this work, a spectroscopic research on laser-produced potassium oxide plasma using optical emission spectroscopy (OES) technology is provided. Laser-induced K2O plasma produced at various laser energy has also been defined by visible emission spectroscopy. Plasma is created by a solid potassium oxide object radiated by a pulsed laser in a room environment. A Nd:YAG laser pulse 9 ns in duration with wavelength of (532) nm and a focal length of (10) cm in the range of energy (300-700) mJ is used to generate plasma from a planar K2O sample. The electron temperature (Te) was calculated in ratio line intensities method, while the electron density (ne) was calculated using Saha-Boltzmann equation, also another plasma parameters was calculated such as plasma (fp), Debye length (λD) and Debye number (ND). The increase in electron temperature and density was observed as a function of laser energies. Measurement of the production of the electron temperature in the rang (0.996-1.202) eV, While the electron density is in the rang (1.8×1016-8.8×1016) cm-3.
    Źródło:
    World Scientific News; 2021, 153, 2; 192-204
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hot electron refluxing in the short intense laser pulse interactions with solid targets and its influence on K-α radiation
    Autorzy:
    Horný, W.
    Klimo, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/148753.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron recirculation
    electron refluxing
    K-α radiation
    laser–plasma interactions
    particle-in-cell simulation
    Opis:
    Fast electrons created as a result of the laser beam interaction with a solid target penetrate into the target material and initialize processes leading to the generation of the characteristic X-ray K-α radiation. Due to the strong electric field induced at the rear side of a thin target the transmitted electrons are redirected back into the target. These refl uxing electrons increase the K-α radiation yield, as well as the duration of the X-ray pulse and the size of the radiation emitting area. A model describing the electron refl uxing was verifi ed via particle- -in-cell simulations for non-relativistic electron energies. Using this model it was confi rmed that the effect of the electron refluxing on the generated X-ray radiation depends on the target thickness and the target material. A considarable increase of the number of the emitted K-α photons is observed especially for thin targets made of low-Z materials, and for higher hot electron temperatures.
    Źródło:
    Nukleonika; 2015, 60, 2; 233-237
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generation of shock waves in dense plasmas by high-intensity laser pulses
    Autorzy:
    Pasley, J.
    Bush, I. A.
    Robinson, A. P. L.
    Rajeev, P. P.
    Mondal, S.
    Lad, A. D.
    Ahmed, S.
    Narayanan, V.
    Ravindra Kumar, D
    Kingham, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147346.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    shock waves
    radiation hydrodynamics
    laser–plasma interactions
    fast ignition
    inertial confinement fusion
    Doppler spectroscopy
    Opis:
    When intense short-pulse laser beams (I > 1022 W/m2, τ < 20 ps) interact with high density plasmas, strong shock waves are launched. These shock waves may be generated by a range of processes, and the relative significance of the various mechanisms driving the formation of these shock waves is not well understood. It is challenging to obtain experimental data on shock waves near the focus of such intense laser–plasma interactions. The hydrodynamics of such interactions is, however, of great importance to fast ignition based inertial confinement fusion schemes as it places limits upon the time available for depositing energy in the compressed fuel, and thereby directly affects the laser requirements. In this manuscript we present the results of magnetohydrodynamic simulations showing the formation of shock waves under such conditions, driven by the j × B force and the thermal pressure gradient (where j is the current density and B the magnetic field strength). The time it takes for shock waves to form is evaluated over a wide range of material and current densities. It is shown that the formation of intense relativistic electron current driven shock waves and other related hydrodynamic phenomena may be expected over time scales of relevance to intense laser–plasma experiments and the fast ignition approach to inertial confi nement fusion. A newly emerging technique for studying such interactions is also discussed. This approach is based upon Doppler spectroscopy and offers promise for investigating early time shock wave hydrodynamics launched by intense laser pulses.
    Źródło:
    Nukleonika; 2015, 60, 2; 193-198
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Verify the plasma parameters generated from the Tin material using the laser-induced plasma technique
    Autorzy:
    Ahmed, Baida M.
    Aadim, Kadhim A.
    Khalaf, Madyan A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030607.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Laser-Induced Plasma (LIP)
    Nd:YAG laser
    Optical Emission Spectroscopic (OES)
    Tin (Sn)
    Opis:
    In this work, A spectroscopic research on laser-produced tin plasma using optical emission spectroscopy (OES) technology is provided. Laser-induced Sn plasma produced at various laser energy has also been defined by visible emission spectroscopy. Plasma is created by a solid tin object radiated by a pulsed laser in a room environment. A Nd:YAG laser pulse 9 ns in duration with wavelength of 1064 nm and a focal length of 10 cm in the range of energy 500-800 mJ is used to generate plasma from a planar Sn sample. The electron temperature (Te) was calculated in ratio line intensities method, while the electron density (ne) was calculated using Saha-Boltzmann equation, also another plasma parameters was calculated such as plasma (fp), Debye length (λD) and Debye number (ND). The increase in electron temperature and density was observed as a function of laser energies. Measurement of the production of the electron temperature in the rang 0.926-0.952 eV, While the electron density is in the rang (1.9×1015-2.5×1015) cm-3.
    Źródło:
    World Scientific News; 2020, 144; 326-337
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Controlling the plasma electron number density of copper metal using NIR picosecond laser-induced plasma spectroscopy
    Autorzy:
    Fikry, Mohamed
    Tawfik, Walid
    Omar, Magdy
    Powiązania:
    https://bibliotekanauki.pl/articles/2033963.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    picosecond
    LIPS
    laser induced plasma spectroscopy
    copper
    electron density
    Stark broadening
    Opis:
    In this paper, we investigate a new method to control the plasma electron number density of copper metal using a near-infrared (NIR) picosecond Nd:YAG laser-induced plasma spectroscopy (LIPS) technique. The applied laser parameters are as follows; laser pulse energy and intensity varied from 29.2 to 59.4 mJ ± 3% and from 6.01×1010 to 12.35×1010 W/cm2 ± 5%, respectively, for a single pulse at 170 ps pulse duration, and beam diameter about 0.5 ± 0.1 mm. By considering the Stark broadening of a specific spectral line, electron density can be calculated using a neutral copper line at 521.8 nm, assuming the local thermodynamic equilibrium (LTE) condition. The observed electron density values were 1.09×1016, 2.24×1016, 3.60×1016, and 4.75×1016 cm–3 for the laser pulse energies 29.2, 41, 52.4, and 59.4 mJ, respectively. The plasma electron density values are increased with the increase in laser pulse energy. Such findings were interpreted due to an increase in the mass ablation rates with laser pulse energy. The obtained results explore the ability to control the plasma electron density by controlling the picosecond pulse energy. These results can contribute to the development of plasma technologies and their applications in many fields.
    Źródło:
    Optica Applicata; 2021, 51, 3; 365-374
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on fast electron transport in the context of fast ignition
    Autorzy:
    Batani, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/146597.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    inertial confinement fusion (ICF)
    fast ignition (FI)
    fast electrons
    ultra-high-intensity lasers
    relativistic laser-plasma interaction
    Opis:
    This paper deals with the problem of fast electron propagation in plasmas, in the context of the fast ignition (FI) approach to inertial confinement fusion (ICF). In FI, a short-pulse high-intensity laser beam should generate a beam of relativistic electrons, which propagate into the compressed pellet, depositing energy and igniting the fuel. The study of electron propagation in dense matter is hence essential to the success of this scheme. The propagation of relativistic electrons in dense matter is determined by collisions of fast electrons with ions and electrons in the material, which can be described in terms of stopping power, but it also depends on self-generated magnetic and electric fields, which play a major, or even dominant role. In this paper we will show the importance of such collective effects by discussing several experimental examples.
    Źródło:
    Nukleonika; 2011, 56, 2; 99-106
    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:
    Laser nuclear fusion: current status, challenges and prospect
    Autorzy:
    Badziak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/201663.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser
    plasma
    inertial fusion
    laser acceleration
    Opis:
    In 2009, in Lawrence Livermore National Laboratory, USA, National Ignition Facility (NIF) - the largest thermonuclear fusion device ever made was launched. Its main part is a multi-beam laser whose energy in nanosecond pulse exceeds 1MJ (106 J). Its task is to compress DT fuel to the density over a few thousand times higher than that of solid-state DT and heat it to 100 millions of K degrees. In this case, the process of fuel compression and heating is realized in an indirect way - laser radiation (in UV range) is converted in the so-called hohlraum (1 cm cylinder with a spherical DT pellet inside) into very intense soft X radiation symmetrically illuminating DT pellet. For the first time ever, the fusion device's energetic parameters are sufficient for the achieving the ignition and self-sustained burn of thermonuclear fuel on a scale allowing for the generation of energy far bigger than that delivered to the fuel. The main purpose of the current experimental campaign on NIF is bringing about, within the next two-three years, a controlled thermonuclear 'big bang' in which the fusion energy will exceed the energy delivered by the laser at least ten times. The expected 'big bang' would be the culmination of fifty years of international efforts aiming at demonstrating both physical and technical feasibility of generating, in a controlled way, the energy from nuclear fusion in inertial confined plasma and would pave the way for practical realization of the laser-driven thermonuclear reactor. This paper briefly reviews the basic current concepts of laser fusion and main problems and challenges facing the research community dealing with this field. In particular, the conventional, central hot spot ignition approach to laser fusion is discussed together with the more recent ones - fast ignition, shock ignition and impact ignition fusion. The research projects directed towards building an experimental laser-driven thermonuclear reactor are presented as well.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 729-738
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser ablated carbon plume : experiment and modelling
    Autorzy:
    Moscicki, T.
    Hoffman, J.
    Szymanski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/146429.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    laser ablation
    plasma plume
    Opis:
    Laser ablation of graphite is studied both theoretically and experimentally. Plasma temperature and electron density in the early phase of expansion into vacuum are measured as a function of distance from the target. The experimental results agree well with the theoretical simulations. The simulation of ablation shows that plasma plume considerably affects the ablation rate.
    Źródło:
    Nukleonika; 2012, 57, 2; 283-286
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Overview of the application of laser - based techniques in plasma - wall interaction research program at IFPiLM
    Autorzy:
    Kubkowska, M.
    Gąsior, P.
    Czarnecka, A.
    Rosiński, M.
    Wołowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147816.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma-wall interaction
    plasma spectroscopy
    laser-induced breakdown spectroscopy (LIBS)
    Opis:
    The purpose of this paper is to give an overview of the progress in the application of the laser-based techniques which has been achieved in the research in the field of plasma-wall interaction (PWI) at the Division of Laser-Produced Plasmas (DLPP), Institute of Plasma Physics and Laser Microfusion (IFPiLM, Warsaw, Poland) since 2005. The evolution of the experimental set-up which started in a simple configuration for the laser ablative co-deposit removal is presented with stress on the milestones which led to subsequent modifications, namely installation of laser induced breakdown spectroscopy (LIBS), fast HR (high resolution) CCDs, pulsed fiber-laser and the common triggering system.
    Źródło:
    Nukleonika; 2012, 57, 2; 163-166
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Capabilities of Thomson parabola spectrometer in various laser-plasma- and laser-fusion-related experiments
    Autorzy:
    Tchórz, Przemysław
    Szymański, Maciej
    Rosiński, Marcin
    Chodukowski, Tomasz
    Borodziuk, Stefan
    Powiązania:
    https://bibliotekanauki.pl/articles/2202568.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    acceleration
    diagnostic
    ion
    laser
    plasma
    Thomson spectrometer
    Opis:
    The Thomson parabola spectrometer (TPS) [1] is a well-known, universal diagnostic tool that is widely used in laser plasma experiments to measure the parameters of accelerated ions. In contrast to other popular ion diagnostics, such as semiconductor detectors or ion collectors, the TPS is not greatly affected by electromagnetic pulses generated during high-power laser interaction with matter and can be tuned to acquire data in various energy ranges of accelerated ions, depending on the goal of the experiment. Despite the many advantages of this diagnostic device, processing the collected data is a diffi cult task and requires a lot of caution during interpretation of gathered results. In this work, we introduce the basic principles of operation and data analysis based on the numerical tool created specifi cally for the TPS designed at the Institute of Plasma Physics and Laser Microfusion, present a range of data obtained during various recent experiments in which our TPS was used, and highlight the diffi culties in data analysis depending on the purpose of the experiment and the experimental setup.
    Źródło:
    Nukleonika; 2023, 68, 1; 29--36
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental assessment of changes in structural steel composition by progressive technology cutting
    Autorzy:
    Mascenik, Jozef
    Powiązania:
    https://bibliotekanauki.pl/articles/2037386.pdf
    Data publikacji:
    2021
    Wydawca:
    STE GROUP
    Tematy:
    laser
    plasma
    water jet
    cutting
    structure
    microhardness
    Opis:
    The submitted paper deals with the issue of change in structure, hardness and thermally affected zone of the samples of a toothed wheel part produced by technology of cutting by plasma, laser and water jet. The cutting process by laser and plasma technology causes intensive thermal affection of material and change in structure and microhardness in the cutting area referred to as thermally affected zone. The paper describes three material cutting technologies of the toothed wheel part. The experimental part contains description of experimental sample preparation, its hardness measurement and examination of structure along with further evaluation through graphs and photo documentation of structures.
    Źródło:
    Management Systems in Production Engineering; 2021, 4 (29); 266-273
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The origin and chronology of medieval silver coins based on the analysis of chemical composition
    Autorzy:
    Pańczyk, E.
    Sartowska, B.
    Waliś, L.
    Dudek, J.
    Weker, W.
    Widawski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147506.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    elemental composition
    medieval Central Europe coins
    scanning electron microscopy (SEM)
    laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS)
    numismatists
    Opis:
    Medieval Central Europe coins – the Saxon coins, also called as the Otto and Adelheid denarii, as well as the Polish ones, the Władysław Herman and Bolesław Śmiały coins – were examined to determine their provenance and dating. Their attribution and chronology often constitute a serious problem for historians and numismatists. For hundreds of years, coins were in uncontrolled conditions and in variable environment. Destructed and inhomogeneous surface were the effect of corrosion processes. Electron microscopy with energy dispersive X-ray analysis (scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS)), X-ray fluorescence (XRF) analysis (energy dispersive X-ray fluorescence (EDXRF) and total reflection X-ray fluorescence (TXRF)), and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) were applied. The results of these investigations are significant for our knowledge of the history of Central European coinage, especially of Polish coinage.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 2; 657-663
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ponderomotive self-focusing of a short laser pulse under a plasma density ramp
    Autorzy:
    Kant, N.
    Saralch, S.
    Singh, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/146636.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    self-focusing
    underdense plasma
    plasma density ramp
    ponderomotive force
    short laser pulse
    Gaussian beam
    Opis:
    The ponderomotive self-focusing of a short laser pulse in an underdense plasma under a plasma density ramp is analyzed. The pulse may acquire a minimum spot size due to the ponderomotive self-focusing. Beyond the focus, the nonlinear refraction starts weakening, and the spot size of the laser pulse increases, resulting in an oscillatory self-focusing and defocusing behavior of the beam with the propagation distance. In order to minimize the defocusing, we introduce a localized upward plasma density ramp. Due to the upward plasma density ramp, the laser beam retains a minimum spot size. Self-focusing becomes stronger with a mild ripple as the propagation distance increases. The conditions for the ponderomotive self-focusing for suitable parameters of the laser beam and the plasma are determined. The plasma density ramp of the considered type may be observed in gas jet plasma experiments.
    Źródło:
    Nukleonika; 2011, 56, 2; 149-153
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhanced resonant second harmonic generation in plasma based on density transition
    Autorzy:
    Kant, N.
    Thakur, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/148562.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    second harmonic generation
    laser
    plasma density ramp
    self-focusing
    Opis:
    Resonant second harmonic generation of a relativistic self-focusing laser in plasma with density ramp profile has been investigated. A high intense Gaussian laser beam generates resonant second harmonic beam in plasma with density ramp profile. The second harmonic undergoes periodic focusing in the plasma channel created by the fundamental wave. The normalized second harmonic amplitude varies periodically with distance and attains maximum value in the focal region. Enhancement in the second harmonic amplitude on account of relativistic self-focusing of laser based on plasma density transition is seen. Plasma density ramp plays an important role to make self-focusing stronger which leads to enhance the second harmonic generation in plasma.
    Źródło:
    Nukleonika; 2015, 60, 2; 355-360
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modyfikacja stanowiska do obróbki laserowej powiększająca wydajność i jakość obróbki
    Modification of a laser processing workstation, enhancing productivity and quality of processing
    Autorzy:
    Liaushuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/202559.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    obróbka
    laser
    polaryzacja
    strumień lasera
    processing
    polarization
    plasma
    quality
    Opis:
    W artykule przedstawione są wybrane zagadnienia związane z obróbką laserową przy wykorzystaniu stanowiska badawczego i lasera Laser Patara (model PA-016-QTG). Celem pracy jest zaprojektowanie i wizualizacja systemów kontroli polaryzacji wiązki lasera podczas cięcia laserem, wykonanie obliczeń i opracowanie dokumentacji technicznej. Opracowanie koncepcji i wykonanie zintegrowanego oprzyrządowania do oświetlenia pola obróbki laserowej oraz zapobiegania niepożądanemu wpływowi plazmy na obróbkę.
    The article dwells on several issues connected with creating a research facility for investigating laser processing of materials. The facility is based on the Patara PA-016-QTG laser. Creating this research facility was connected with developing the visualization of systems controlling laser beam polarization in the process of laser cutting, and creating the complex equipment for illuminating the field of laser processing, and for preventing the unwanted effect of plasma on the processed surface. The concept solutions obtained in the development process are presented together with the author’s calculations and extracts from the technical documentation which appeared in the process of their production.
    Źródło:
    Zeszyty Naukowe Politechniki Poznańskiej. Organizacja i Zarządzanie; 2015, 65; 55-69
    0239-9415
    Pojawia się w:
    Zeszyty Naukowe Politechniki Poznańskiej. Organizacja i Zarządzanie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Instytut Fizyki Plazmy i Laserowej Mikrosyntezy – 40 lat badań dla zrównoważonego rozwoju
    The Institute of Plasma Physics and Laser Microfusion - 40 years of research for sustainable development
    Autorzy:
    Bielski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/214237.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Instytut Fizyki Plazmy i Laserowej Mikrosyntezy
    fizyka plazmy
    urządzenia badawcze
    tematyka badań
    współpraca międzynarodowa
    Institute of Plasma Physics and Laser Microfusion
    plasma physics
    research infrastructure
    fields of research
    international collaboration
    Opis:
    W roku 2016 mija 40 rocznica założenia Instytutu Fizyki Plazmy i Laserowej Mikrosyntezy w Warszawie. Został on utworzony w dniu 1 stycznia 1976 r. celem badania różnych metod i urządzeń do wytwarzania gorącej plazmy, w których mogą zachodzić reakcje syntezy termojądrowej (fuzji) jąder izotopów wodoru (reakcje DD - deuter-deuter albo DT - deuter-tryt). Badania plazmy laserowej realizowano także we współpracy z Instytutem Fizyki Rosyjskiej Akademii Nauk - RAN Moskwie (FIAN) kierowanym przez prof. N. Basowa laureata nagrody Nobla. W 2005 r. nastąpiło podpisanie z Komisją Europejską Kontraktu Asocjacyjnego. Na jego podstawie rozpoczęła się w Polsce działalność koordynowana przez IFPiLM Asocjacja EURATOM-IFPiLM grupująca kilkanaście polskich ośrodków zajmujących się badaniami i technologiami fuzyjnymi w układach z magnetycznym utrzymaniem plazmy (MCF) tzn. w tokamakach i w stellaratorach. Rozpoczęto od podstaw opracowywanie metod diagnostycznych dla układów MCF, stosowanie technik laserowych w technologiach fuzyjnych i badania efektów oddziaływania plazma – ściana także z użyciem układu PF-1000. Dla stellaratora W7-X (w Greifswald, Niemcy) przygotowano układy do diagnostyki rentgenowskiej, a dla układu JET oryginalny detektor promieniowania X (detektor GEM). IFPiLM uczestniczy w dużym projekcie dotyczącym opracowywania koncepcji radialnej kamery neutronowej dla budowanego tokamaka ITER (w Cadarache, Francja). W IFPiLM realizowane są modelowania numeryczne plazmy w układach MCF. Sukcesywnie zwiększa się udział naukowców z IFPiLM w badaniach na dużych tokamakach w Europie (głównie na układzie JET w Culham, Wielka Brytania). W programie EURATOM jest też projekt dotyczący fuzji laserowej (IFE) realizowany w IFPiLM. Od 2014 r. europejski program fuzyjny jest koordynowany przez konsorcjum EUROfusion. Program krajowy koordynuje IFPiLM w ramach Centrum – Nowe Technologie Energetyczne (CeNTE). Obok prac dotyczących fuzji laserowej w IFPiLM prowadzone są badania oddziaływań laserów dużej mocy z materią. Większość tych prac jest wykonywana w ramach konsorcjum LaserLab-Europe realizowanych głównie w Ośrodku Badawczym PALS w Pradze (Republika Czeska). Od 2007 r. w Instytucie rozpoczęto badania i budowę plazmowych napędów satelitarnych w ramach projektów międzynarodowych. W 2013 r. zbudowany w IFPiLM prototyp (silnik typu Halla) przeszedł pomyślnie testy w laboratoriach ESA w Holandii i w IFPiLM. Instytut podlega Ministerstwu Energii. Pierwszym dyrektorem Instytutu był prof. Sylwester Kaliski. Od października 2010 r. dyrektorem Instytutu jest dr hab. prof. Andrzej Gałkowski. W IFPiLM jest zatrudnionych 85 pracowników (w tym 10 profesorów i 25 doktorów).
    The year 2016 marks the 60th anniversary of the establishment of the Institute of Plasma Physics and Laser Microfusion in Warsaw (Poland). The newly-created institute realized research on the properties of laser-produced plasma, plasma generated in high-current discharges in plasma-focus devices, and compression of plasma using explosive materials. On 1 January 2007, the Euratom-IPPLM Association was established for coordination by the IPPLM over ten institutions all over Poland that carry out research in plasma physics and technology related to magnetic confinement fusion in the tokamaks and stellarators. New projects were initiated: study of plasma processes in tokamaks, research in fusion technology, development of diagnostics for tokamaks (JET, WEST and ITER), and for the stellarator W7-X. Since 2007, the IPPLM has participated in the European HiPER project, whose aim is to build a fusion infrastructure to demonstrate the effectiveness of laser fusion. After the year 2013, the research and development of fusion in Europe is coordinated by the consortium EUROfusion. The Polish fusion programme is presently coordinated by the IPPLM within the Center of New Technologies for Energy (CeNTE). Generally, the previously realised research is continued. Since October 2010, the director of the institute has been Prof. Andrzej Gałkowski. Currently, the Institute is employing 85 workers, including 45 researchers.
    Źródło:
    Postępy Techniki Jądrowej; 2016, 3; 2-4
    0551-6846
    Pojawia się w:
    Postępy Techniki Jądrowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functional plasma-deposited coatings
    Autorzy:
    Pashechko, M.
    Kindrachuk, M.
    Gumeniuk, I.
    Tisov, O.
    Zahrebelniy, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/957956.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    plasma deposition
    coating
    laser treatment
    thermal cycling
    mass transfer
    adhesion
    wear resistance
    Opis:
    The paper focuses on the problem of low adhesion of plasma sprayed coatings to the substrate. The subsequent laser treatment modes and their influence on the coating-substrate interface were studied. This allows to decrease the level of met-stability of the coating, thus decreasing its hardness down to 11–12 GPa on the surface and to about 9 GPa on depth of 400 μm. The redistribution of alloying elements through solid and liquid diffusion improves mechanical properties and rises the adhesion up to 450 MPa after remelting and up to 90–110 MPa after laser-aided thermal cycling. At the same time, remelting of coating helps to decrease its porosity down to 1%. The obtained complex of properties also allows to improve wear resistance of coatings and to decrease friction factor.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 4; 301-304
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The source of X-rays and high-charged ions based on moderate power vacuum discharge with laser triggering
    Autorzy:
    Alkhimova, M. A.
    Vovchenko, E. V.
    Melekhov, A. P.
    Ramakoti, R. S.
    Savelov, A. S.
    Krapiva, P. S.
    Moskalenko, I. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/146864.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    laser-triggered vacuum discharge
    sources of X-rays
    ion composition of plasma
    Opis:
    The source of X-ray radiation with the energy of quanta that may vary in the range hv = 1÷12 keV was developed for studies in X-ray interaction with matter and modifi cation of solid surfaces. It was based on a vacuum spark discharge with the laser triggering. It was shown in our experiments that there is a possibility to adjust X-ray radiation spectrum by changing the confi guration of the electrode system when the energy stored in the capacitor is varied within the range of 1÷17 J. A comprehensive study of X-ray imaging and quanta energy was carried out. These experiments were carried out for the case of both direct and reverse polarity of the voltage on the electrodes. Additionally, ion composition of plasma created in a laser-triggered vacuum discharge was analyzed. Highly charged ions Zn(+21), Cu(+20) and Fe(+18) were observed.
    Źródło:
    Nukleonika; 2015, 60, 2; 221-227
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wavelet analysis of time-of-flight ion mass spectrometry signals
    Analiza falkowa sygnałów otrzymywanych w spektrometrze czasu przelotu
    Autorzy:
    Rumianowski, R.
    Józefczyk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/256348.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
    Tematy:
    laser deposition
    plasma technology
    wavelet analysis
    osadzanie laserowe
    technologia plazmowa
    analiza falkowa
    Opis:
    The problem of deposition of thin layers on non-layer substrates occupies a special place in modem materials technology. One of the fast-growing methods is laser ablation involving the evaporation of materiał by the laser pulse, thereby forming a plasma cloud, which is then deposited on the substrate. The basie method of diagnostics of plasma cloud is a mass spectrometer. The paper has presented the physical bases of the operation time of flight mass spectrometer and the theoretical models of signal received from the spectrometer. In the experimental part, the spectrum obtained for Pb2 lead particles that were then subjected to wavelet analysis is presented, thanks to which we have received additional information about the composition of the plasma cloud and about any other isotopes. The paper is an introduction to further research on the use of wavelet transform in spectroscopic analysis.
    We współczesnej technologii materiałowej szczególne miejsce zajmuje zagadnienie osadzania cienkich warstw na innych niż warstwa podłożach. Jedną z szybko rozwijających się metod jest ablacja laserowa polegająca na odparowaniu impulsem lasera materiału, w wyniku czego powstaje obłok plazmy, który jest następnie osadzany na podłożu. Podstawową metodą diagnostyki obłoku plazmy jest spektrometr masowy. W pracy przedstawiono podstawy fizyczne działania spektrometru masowego czasu przelotu oraz teoretyczne modele sygnału otrzymywanego ze spektrometru. W części doświadczalnej zaprezentowano widmo otrzymane dla cząsteczki ołowiu Pb2, które następnie poddano analizie falkowej, dzięki czemu otrzymano dodatkowe informacje o składzie obłoku plazmy. Praca jest wstępem do dalszych badań nad zastosowaniem transformaty f alkowej w analizie spektroskopowej.
    Źródło:
    Problemy Eksploatacji; 2016, 4; 119-126
    1232-9312
    Pojawia się w:
    Problemy Eksploatacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of plasma expansion plumes in view of pulses laser irradiating centimeter-scale spherical space debris
    Autorzy:
    Fang, Yingwu
    Powiązania:
    https://bibliotekanauki.pl/articles/27310108.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    plasma expansion plume
    pulse laser
    centimeter-scale spherical space debris
    dynamic model
    Opis:
    The objective of this article was to investigate the dynamic evolution behaviors of plasma expansion plumes by pulses laser irradiating centimeter-scale spherical space debris. A calculated model of centimeter-scale spherical space debris irradiated by pulses laser was firstly deduced based on FEM (finite element method)/COMSOL, and the action rules of plasma expansion plumes by pulses laser-generated irradiating the debris were simulated for different laser powers and action times. The results showed that the velocity of plasma expansion plumes was increased with the increase of laser powers and action times. Especially, when the laser power was 700 kW and the action time was close to 25 μs, the maximum velocity of plasma expansion plumes approached 1.91 km/s, and the diffusion radius of plasma expansion plumes was increased by about 2.5 mm. Further, the diffusion radius was about twice that of 400 kW when the action time reached about 48 μs. As a result, by simulating the transient flow process of nanosecond pulses laser irradiating small spherical space debris, the flow field evolution information and plasma plumes evolution characteristics of centimeter-scale space debris at nanosecond time resolution were revealed.
    Źródło:
    Optica Applicata; 2023, 53, 3; 363--375
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Self-similar solution of laser-produced plasma expansion into vacuum with kappa-distributed electrons
    Autorzy:
    Bennaceur-Doumaz, D.
    Bara, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/146601.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    kappa distribution function
    laser-produced plasmas
    nonthermal electrons
    plasma expansion
    self-similar solution
    Opis:
    The expansion of semi-infi nite laser produced plasma into vacuum is analyzed with a hydrodynamic model for cold ions assuming electrons modeled by a kappa-type distribution. Self-similar analytic expressions for the potential, velocity, and density of the plasma have been derived. It is shown that nonthermal energetic electrons have the role of accelerating the self-similar expansion.
    Źródło:
    Nukleonika; 2016, 61, 2; 115-118
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Factors Influencing Dry Sliding Wear Behaviour of Laser Remelted Plasma Sprayed Mo Coating Using Response Surface Methodology
    Autorzy:
    Manjunatha, S. S.
    Manjaiah, M.
    Basavarajappa, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/356714.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser remelting
    plasma spray
    central composite design (CCD)
    response surface methodology (RSM)
    Mo coating
    Opis:
    Plasma spraying is a process widely used to fabricate wear resistant coatings. However, various problems are associated with plasma spraying out of which poor bonding strength between the coating and the substrate and the high porosity in the as sprayed coatings are of major concern. In order to eliminate these problems and enhance wear performance, the laser remelting process has been used. The laser remelting of plasma sprayed Mo coatings alters the wear mechanism and improves the wear resistance. The wear mechanism and wear volume loss depend on the applied load, sliding speed and sliding distance. Hence, an effort has been made to investigate the effect of process parameters on volume loss using Response Surface Methodology (RSM) based mathematical models. The experiments were planned as per Central Composite Design (CCD). The investigations revealed that the applied load was the most dominant factor affecting the volume loss of the coating. The sliding speed, sliding distance and interaction effects were considered as the next important parameters influencing the volume loss. The investigation also reveals that, the wear volume loss depends on two wear mechanisms, one being the formations of grooves along surface tribo films and other being fracture of splats with delamination of the coating.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 217-225
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Zno Nano Material Interaction With Nd:YAG Laser Under Vacuum
    Autorzy:
    Hussam, N. Mohammed Ali
    Yahya, Abdulkreem Salman
    Powiązania:
    https://bibliotekanauki.pl/articles/1179694.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Langmuir probe
    Nd:YAG laser etching
    Plasma generation
    ZnO nanomaterial
    electron density
    electron temperature
    Opis:
    The goal of this paper is to study the Nd:YAG laser interaction with the ZnO nanomaterial by etching the ZnO nanodisc surface. The preparation of ZnO nanodisc is studied also and the setup which we use in previous experiment published in the (IJRRR, Vol. X, Issue 1, March 2017) is used also. The interaction is done under vacuum conditions with high pressure in the range of (10-3) Tor. The main target of the paper is to study the plasma generated from the etching of the ZnO nanodisc by Nd:YAG laser.
    Źródło:
    World Scientific News; 2017, 72; 248-255
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ARIES 2018 : infrastructure, innovation, outreach
    Autorzy:
    Romaniuk, Ryszard S.
    Powiązania:
    https://bibliotekanauki.pl/articles/226770.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    particle accelerators
    accelerator science and technology
    novel accelerators
    high field magnets
    superconducting magnets
    RF particle guns
    particle detectors
    high energy physics
    applications of particle accelerators
    laser and plasma accelerators
    community and social implications of ARIES
    EC Integrating Introduction
    Opis:
    This article has two outreach aims. It concisely summarizes the main research and technical efforts in the EC H2020 ARIES Integrating Activity – Accelerator Research and Innovation for European Science and Society [1] during the period 2017/2018. ARIES is a continuation of CARE, TIARA and EuCARD projects [2-3]. The article also tries to show these results as an encouragement for local physics and engineering, research and technical communities to participate actively in such important European projects. According to the author’s opinion this participation may be much bigger [4-27]. All the needed components to participate – human, material and infrastructural are there [4,7]. So why the results are not satisfying as they should be? The major research subjects of ARIES are: new methods of particles acceleration including laser, plasma and particle beam interactions, new materials and accelerator components, building new generations of accelerators, energy efficiency and management of large accelerator systems, innovative superconducting magnets, high field and ultra-high gradient magnets, cost lowering, system miniaturization, promotion of innovation originating from accelerator research, industrial applications, and societal implications. Two institutions from Poland participate in ARIES – these are Warsaw University of Technology and Institute of Nuclear Chemistry and Technology in Warsaw. There are not present some of the key institutes active in accelerator technology in Poland. Let this article be a small contribution why Poland, a country of such big research potential, contributes so modestly to the European accelerator infrastructural projects? The article bases on public and internal documents of ARIES project, including the EU Grant Agreement and P1 report. The views presented in the paper are only by the author and not necessarily by the ARIES.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 1; 119-124
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optymalizacja parametrów pracy aparatury pomiarowej w analizie pierwiastkowej tkanek miękkich techniką ablacji laserowej z detekcją w spektrometrze mas z plazmą sprzężoną indukcyjnie
    Optimization of operating parameters of the measuring apparatus in elemental analysis of soft tissues using laser ablation technique with the detection in the mass spectrometer with inductively coupled plasma
    Autorzy:
    Lorenc, W.
    Barałkiewicz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/134863.pdf
    Data publikacji:
    2016
    Wydawca:
    ADVSEO
    Tematy:
    laser ablation
    inductively coupled plasma mass spectrometry
    optimization of operating parameters of instruments
    soft tissue
    Opis:
    Operating parameters of measurement equipment for the laser ablation of detection in the mass spectrometer with inductively coupled plasma were optimized. Optimization was employed in order to choose the conditions for carrying analyzes to ensure high analytical signal intensities and low values of relative standard deviation. Optimization was performed on a model sample with physicochemical properties similar to those of real samples of soft tissue. The following parameters underwent optimization: the energy of the laser pulse frequency, beam diameter and scanning speed. The selection of the optimal operating parameters was determined based on the intensity of the signal analysis, RSD value and visual evaluation of the process of ablation. Measurements were made using a quadrupole ICP-MS spectrometer (Elan DRC II PerkinElmer) with a laser ablation system (LSX-500 Cetac).
    Źródło:
    Technical Issues; 2016, 3; 67-73
    2392-3954
    Pojawia się w:
    Technical Issues
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Supertwarde warstwy W-B i W-Ti-B osadzane z tarcz spiekanych metodą SPS
    Super-hard films W-B and W-Ti-B deposited from targets sintered by SPS method
    Autorzy:
    Psiuk, Rafał
    Słomińska, Hanna
    Hoffman, Jacek
    Mościcki, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/211903.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej
    Tematy:
    ablacja laserowa
    borki wolframu domieszkowane tytanem
    spiekanie plazmowe
    laser ablation
    tungsten borides doped titanium
    plasma sintering
    Opis:
    Z rosnącym zapotrzebowaniem na niezawodne, a jednocześnie zapewniające dużą wydajność, narzędzia do skrawania i obróbki plastycznej, coraz większego znaczenia nabiera rozszerzająca się grupa supertwardych ceramik przewodzących prąd. Mate-riały te dobrze rokują w związku z rozwiązaniem problemów tradycyjnych materiałów narzędziowych, których niedoskonałości obejmują wysoką cenę (azotek krzemu, azotek boru), niezdolność do cięcia stopów żelaza w wyniku reakcji chemicznych (diament), niestabilność w obecności wilgoci (azotek boru) i względnie małą twardość (węglik wolframu). Również rosnący popyt na powłoki ochronne o wysokiej twardości, o dob-rych właściwościach sprężystych i stabilności termicznej powoduje, że badania nad nowymi systemami materiałowymi prowadzone są coraz intensywniej. Pomimo że azotki metali przejściowych są już z powodzeniem stosowane do różnych zadań w prze-myśle samochodowym i lotniczym, poszukiwanie ulepszonych materiałów jest tematem wciąż aktualnym. W pracy przedstawiono badania nad osadzaniem cienkich powłok z nowych supertwardych materiałów (SHM), którymi są borki wolframu. Dodatkowo zbadano wpływ domieszkowania tych materiałów tytanem. Warstwy osadzane były metodą ablacji laserowej PLD. Tarcze do osadzania zsyntetyzowane zostały metodą spiekania plazmowego SPS proszków boru i wolframu o stosunku atomów 4,5 do 1. Osadzane z użyciem lasera warstwy mają skład stechiometryczny podobny do użytych tarcz. W warstwach tych dominuje faza WB3. Badania przeprowadzone z użyciem SEM, XRD i nanoindentacji wykazały, że skład fazowy tarcz jest odwzorowany w war-stwach osadzonych laserem. Wszystkie uzyskane warstwy są bardzo twarde i stabilne termicznie. Warstwy osadzane laserem odznaczają się dużą chropowatością. Domiesz-kowanie tytanem zwiększa ilość fazy WB3 w spiekanych tarczach i osadzanych war-stwach oraz zmniejsza ilość i wielkość naniesionych na powierzchnię cząstek.
    With increasing demand for high-performance and long-lasting cutting and forming tools, the members of this expanding class of superhard metals hold promise to address the shortcomings of traditional tool materials. Those shortcoming include their high cost (silicon nitride, cubic boron nitride, and diamond), their inability to cut ferrous metals due to chemical reactions (diamond), instability in the presence of humidity (cubic boron nitride) and relatively low hardness (tungsten carbide). Also the increasing industrial demand for protective coatings with high hardness, good elastic properties and thermal stability calls for the investigation of new material systems. Although transition metal (TM) nitrides are successfully applied for different tasks in automotive or aero-space industries, the search for improved materials is an ongoing topic, being far from its end. In this work the study on deposition of thin films made of new super-hard materials (SHM) such as tungsten boride are presented. Additionally, the influence of doping by titanium of those materials is investigated. Investigated films were deposited by the pul-sed laser deposition method. The used targets were synthetized by SPS method. The powders of boron and tungsten in 4.5 to 1 molar faction were used. The films deposited by PLD method have stoichiometric composition such as used targets. The WB2 and WB3 phase are dominant. Research carried out using SEM, XRD and nanoindentation test showed that the phase composition of the targets is more important in the case of laser deposition than magnetron. All obtained layers are very hard and thermally stable. In the case of magnetron sputtering, smooth layers were obtained while the layers depo-sited by the laser have a very high roughness. Titanium doping increases the amount of WB3 phase in the sintered discs, while it has no significant effect on the properties of the deposited layers.
    Źródło:
    Obróbka Plastyczna Metali; 2019, 30, 2; 107-120
    0867-2628
    Pojawia się w:
    Obróbka Plastyczna Metali
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the bonding strength of FE-based self-fluxing alloy coating deposited by different methods on the steel substrate
    Autorzy:
    Feldshtein, E.
    Kardapolava, M.
    Dyachenko, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/266279.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    natryskiwanie plazmowe
    siła wiązania
    przetapianie laserem
    Fe-based self-fluxing alloy
    coating
    plasma spraying
    laser remelting
    bonding strength
    Opis:
    In the present paper, the bonding strength of Fe-based self-fluxing alloy coating deposited by plasma spraying, gluing and laser remelting and alloying on the steel substrate have been investigated. When flame melting, a globular structure is formed. Against the background of the solid solution carbide-boride phases are clearly distinguishable, between which the Fe–Fe2B and Fe–FeB eutectic colonies are situated. Laser remelting leads to the formation of metastable structures, reinforced with dendrites, consisting of alloyed Fe-α and Fe-γ. At the low laser beam speeds the coating is melted completely with the formation of a cast structure with the dendrites. When the laser beam speed is increased, the dendritic structure gets fragmented. Structures of coatings alloyed with B4C and remelted by the laser beam vary with the increase of the spot speed. The bonding strength of coating without subsequent remelting decreases by 4–5 times in comparison with remelted. The bonding strength of the reinforced glue coating has adhesive and adhesive-cohesive character. When the load increases in the coating, microcracks develop, which gradually spread to the center of the bonding surface. For plasma coatings after laser remelting without additional alloying, the maximum bonding strength is observed with the minimum laser beam speed. With increasing the laser beam speed it decreases almost 1.5 times. In glue coatings reinforced with B4C particulates by laser remelting, the bonding strength is lower by 1.2–1.4 times in comparison with plasma coating.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 355-364
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laserowe i plazmowe cięcie blach ze stali niestopowych i kwasoodpornych
    Thermal methods of shaping from sheets of inox and coal steels
    Autorzy:
    Zaborski, S.
    Stechnij, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/270023.pdf
    Data publikacji:
    2011
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    cięcie laserowe
    cięcie plazmowe
    chropowatość
    przemiana fazowa
    przemiana strukturalna
    laser cutting
    plasma cutting
    roughness
    phase transition
    structural transformation
    Opis:
    W referacie porównano, możliwe do uzyskania w warunkach przemysłowych, parametry jakości ciętych powierzchni, wyznaczonych na krawędziach typowych konstrukcyjnych materiałów metalowych. Celem działań eksperymentalnych było udzielenie pragmatycznej odpowiedzi na pytanie o wynikowe chropowatości powierzchni podczas cięcia laserowego i plazmowego dla identycznych elementów wykonanych ze stali niestopowej S235JRG2 oraz austenitycznej nierdzewnej 0H18N9. Zaprezentowano wyniki wielowariantowych prób przecinania metodami skoncentrowanej wiązki energii (plazma, laser), pokazując różnorodne możliwości kształtowania geometrii powierzchni obrabianych elementów. Publikacja ma charakter prezentacji praktycznego doświadczenia przemysłowego i formułuje utylitarne wnioski.
    The report compares possible to the obtainment, in industrial conditions, parameters of the surfaces quality, on edges in typical constructional materials of metal industry. Allowing the pragmatic answer on the question, about the roughness of the surface, while laser and plasma cutting. Details executed from coal steel S235JRG2 and stainless steel 0H18N9. Showing the varied possibilities of formation the geometry of the surface. The publication has the character of the practical industrial experience and formulates utilitarian conclusions.
    Źródło:
    Inżynieria Maszyn; 2011, R. 16, z. 4; 109-116
    1426-708X
    Pojawia się w:
    Inżynieria Maszyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The characteristics of welded joints of stainless steel for air conditioning application
    Charakterystyka połączeń spawanych ze stali odpornej na korozje w systemach klimatyzacji
    Autorzy:
    Węglowski, M. S.
    Węglowska, A.
    Kwieciński, K.
    Dworak, J.
    Rykała, J.
    Ziobro, G.
    Szafron, A.
    Noga, P.
    Richert, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/176124.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    air-conditioning
    laser welding
    plasma microwelding
    high speed friction welding
    klimatyzacja
    spawanie wiązką laserową
    spawanie mikroplazmowe
    zgrzewanie tarciowe szybkoobrotowe
    Opis:
    In the paper the results of metallographic examination of welded joints for car air-conditioning unit are presented. The European directives 2006/40/EC on the greenhouse gasses elimination demand to stop using traditional refrigerant and to change it to R744 medium in air conditioning installation. The R744 (CO2) refrigerant is environmental friendly medium if compared with standard solution such as R12, R134a or R1234yf and safer for passengers than R1234yf. The non-standard thermodynamic parameters of the R744 which translate into high pressure and high temperature require specific material to develop the shape and to specify the technology of manufacturing for the particular elements of the conduits and moreover the technologies of joining for the whole structure, which would meet the exploitation requirements of the new unit. To produce the test welded joints of stainless steels three different joining technologies were applied: laser welding, plasma welding as well as high speed friction welding. The results indicated that laser and plasma technologies guaranty the proper quality of welded joints and can be used for the air conditioning application in automotive industry.
    W pracy przedstawiono analizę wyników badań mikroskopowych połączeń spawanych stosowanych w samochodowych systemach klimatyzacji. Europejska dyrektywa 2006/40/WE dotycząca gazów cieplarnianych wymaga ograniczenia dotychczas używanych tradycyjnych czynników chłodniczych. Zaleca stosowanie czynnika R744 w instalacjach klimatyzacji. Nowy czynnik chłodniczy R744 (CO2) jest mniej niebezpieczny dla środowiska i bezpieczniejszy dla pasażerów w porównaniu z tradycyjnymi, m.in.: R12, R134a lub R1234yf niż R1234yf. Niestandardowe parametry termodynamiczne eksploatacji czynnika R744 - duże ciśnienie i wysoka temperatura wymagają wprowadzenia nowych materiałów, zmiany konstrukcji samych systemów i opracowania technologii poszczególnych jej elementów - przewodów. Również opracowania technologii łączenia elementów instalacji całej konstrukcji, spełniającej wymagania eksploatacyjne nowego systemu klimatyzacji. Próbne połączenia spawane elementów ze stali nierdzewnej wykonano z zastosowaniem trzech technologii: spawanie laserowe i mikroplazmowe oraz zgrzewanie tarciowe. Analiza wyników prowadzonych badań wykazała, że technologie laserowe i mikroplazmowe gwarantują odpowiednią jakość połączeń spawanych. Mogą być stosowane w systemach klimatyzacji w przemyśle motoryzacyjnym.
    Źródło:
    Advances in Manufacturing Science and Technology; 2017, 41, 3; 25-33
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of nitrogen on thermodynamic properties and plasma composition in discharge tube of CO-laser
    Autorzy:
    Grigorian, G. M.
    Cenian, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/240382.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CO-laser
    vibrational kinetics
    dissociation
    plasma-chemistry
    CN molecules
    C2
    electron kinetics
    dysocjacja
    chemia plazmy
    molekuły cyjanu
    kinetyka elektronów
    Opis:
    The role of the addition of nitrogen to the discharge plasma of CO lasers on thermodynamic properties and composition of the laser active medium is discussed here. It is shown that nitrogen addition improves laser characteristics and changes the composition of the laser active medium. The addition of nitrogen significantly decreases CO dissociation level and concentrations of C atoms created in plasma-chemical reactions of laser discharge.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 3; 31-43
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości tribologiczne powłok na bazie żelaza otrzymanych różnymi metodami technologicznymi
    The tribological properties of ferrous based coatings formed using different technological methods
    Autorzy:
    Feldshtein, E.
    Kardapolova, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/189880.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    natryskiwanie plazmowe
    stopowanie laserowe
    powłoki na bazie żelaza
    współczynnik tarcia
    zużycie
    plasma spraying
    laser alloying
    ferrous-based coatings
    friction coefficient
    wear
    Opis:
    W artykule przedstawiono wpływ powłok na bazie żelaza o różnym składzie chemicznym, nanoszonych różnymi metodami technologicznymi oraz warunków tarcia na właściwości tribologiczne pary trącej, tj. współczynnik tarcia i intensywność zużycia elementów węzła tarcia. Materiałem, na który nakładano powłokę, była stal C45, grubość powłok znajdowała się w zakresie 0,5-0,7 mm.
    Plasma-sprayed coatings on the base self-fluxing alloys were investigated. Clean ferrous-based alloy P-Cr16Fe5B4Si4 was used as well as the same with the addition of TaB, MoB, and B4C powders. Fire and laser washing were used to form coatings. The thickness measurements of coatings after processing were from 0.5–0.7 mm, on the base material of steel C45. The metallographic analysis indicated that coating structure depends on the chemical composition of the powder as well as the coating technology. When using an Amsler friction-wear machine, it was determined that when dry technical friction increasingly spreads of torque of friction are observed after some minutes of work, and when oil friction torque are very stable. Additional MoB laser alloying of the coating on a base of P-Cr4Mn2B4Si2V1 powder guarantees a minimal value of the mean friction coefficient. However, the minimal value of the momentary friction coefficient was registered for the coating with additional B4C laser alloying. During dry technical friction, using a coating on a base of P-Cr4Mn2B4Si2V1 powder with additional MoB or B4C laser alloying guarantees a multiple decrease in wear intensity. The presence of oil decreases the influence of material and technology of coating on wear intensity, the difference of values is no more then 20%.
    Źródło:
    Tribologia; 2011, 3; 31-42
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of cutting technology on properties of the cut edges
    Wpływ technologii cięcia na właściwości warstwy wierzchniej stali krawędzi ciętych
    Autorzy:
    Węglowski, M.S.
    Pfeifer, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/175855.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    plasma cutting
    laser beam cutting
    water jet cutting
    oxyfuel flame cutting
    cięcie plazmą
    cięcie wiązką laserową
    cięcie strumieniem wody
    cięcie tlenem
    Opis:
    The influence of cutting technologies on the quality, mechanical properties and microstructure of the cut edges of steel is presented. The cutting technologies cover: plasma, laser beam, water jet and oxyfuel flame cutting. During investigation the measurements of perpendicularity tolerance, hardness, mean high of the profile Rz5 and metallographic examination were carry out. The results revealed that the lowest hardness was achieved by water jet cutting, whereas the highest was obtained by plasma cutting under the water surface. The lowest perpendicularity was obtained by plasma cutting under the water surface but the highest was achieved by laser and HD plasma cutting. The conducted experiments revealed moreover that the lowest roughness was achieved by means of plasma cutting over the water surface, whereas the highest by laser beam cutting.
    W pracy przedstawiono wpływ technologii cięcia na właściwości mechaniczne, mikrostrukturę i jakość warstwy wierzchniej. Technologie cięcia obejmowały cięcie: plazmą, wiązką laserową, strumieniem wody oraz tlenem. Prowadzono pomiary tolerancji prostopadłości, twardości, średniej wysokości profilu Rz5. Wykonano również badania metalograficzne. Najmniejsza twardość powierzchni po cięciu zapewnia cięcie strumieniem wody, natomiast największe cięcie plazmą pod lustrem wody. Najmniejszą tolerancję prostopadłości zapewnia cięcie plazmą pod lustrem wody, natomiast największą cięcie wiązką laserową i plazmą HD. Najmniejszą chropowatość powierzchni zapewnia technologia cięcia plazmą nad lustrem wody, natomiast największą wiązką laserową.
    Źródło:
    Advances in Manufacturing Science and Technology; 2014, 38, 2; 63-73
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of unconventional methods of cutting on microstructure, topography and microhardness changes in steel
    Wpływ niekonwencjonalnych metod cięcia na zmiany mikrostruktury i właściwości stali węglowej
    Autorzy:
    Leszczyńska-Madej, B.
    Richert, M.
    Sak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/263864.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    plasma arc cutting
    laser cuting
    structure changes
    microhardness changes
    head affected zone
    cięcie łukiem plazmowym
    cięcie laserowe
    zmiany struktury
    mikrotwardość
    strefa wpływu ciepła
    Opis:
    The carbon steel for ąuenching and tempering has been cut with two different techniques, plasma arc and laser. The influence of these two unconventional methods of cutting on the changes of microstructure and properties has been studied in this paper. The structure changes after cutting were investigated by means of both light and scanning electron microscopy, additionally microhardness in the heat affected zone was measured. The performed investigations show that both methods of cutting have a strong influence on the structure and properties of investigated steels. Characteristic structure of cut area was a bainitic structure. The amount of bainite structure decreased with increased distance from the edge of the cutting sample. The plasma arc cutting influences the structure changes morę than laser beam. The bainitic structure after this method of cutting was observed to a depth of near 130 micrometers (laser), whereas after plasma arc - average 400 micrometers. Measured microhardness at the edge after cutting by both methods was about 28OHvO.l what makes up 130% increase comparing to materiał beyond the heat affected zone.
    Stal węglową do ulepszania cieplnego wycięto dwiema metodami: lukiem plazmowym i laserem. W artykule przedstawiono porównawcze wyniki badania mikrostruktury i mikrotwardości w strefie wpływu ciepła po cięciu stali tymi dwiema metodami. Cechą charakterystyczną było wystąpienie struktury bainitycznej w strefie wpływu cięcia. W przypadku cięcia laserem struktura bainitu obserwowana była do głębokości około 130 (Jm, z kolei po cięciu łukiem plazmowym strefa wpływu sięgała aż do głębokości 400 nm. Zmierzona mikrotwardość przy krawędzi po cięciu zarówno łukiem plazmowym, jak i laserem wynosiła około 280 Hv0,l, co w porównaniu z materiałem poza strefą wpływu stanowi wzrost o ponad 130%.
    Źródło:
    Metallurgy and Foundry Engineering; 2012, 38, 2; 109-115
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przecinanie materiałów na obrabiarkach CNC : wybór metody
    Cutting materials on CNC : methods selection
    Autorzy:
    Mazurkiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/315195.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    obrabiarki CNC
    przecinanie materiałów
    cięcie materiałów
    cięcie plazmowe
    cięcie laserem
    elektrodrążenie
    cięcie strumieniem wody
    cutting materials
    material cutting
    CNC machines
    water jet cutting
    laser cutting
    plasma cutting
    electrodischarge
    Opis:
    Cięcie materiałów stanowi pierwszą operacją technologii wytwarzania wyrobów. Zastosowanie nowoczesnych technologii cięcia, do których zaliczamy cięcie plazmowe, laserowe, elektrodrążenie i strumieniem wodnym, daje w tym zakresie duże możliwości. Wynika to głównie z zastosowania maszyn CNC realizujących precyzyjnie cały zaprojektowany proces cięcia. W artykule zwrócono uwagę na czynniki wpływające na wybór odpowiedniej metody cięcia na podstawie wymagań stawianych wyrobom, a także możliwości wynikającej z charakteru zastosowanej technologii oddziaływującej w odpowiedni sposób na materiał obrabiany.
    Cutting materials is the first step of manufacturing technology. The use of modern cutting technology, which include plasma cutting, laser, electrical discharge and water jet in this area gives great opportunities. This is mainly due to the use of CNC machines implementing the designed precision cutting process. The article focuses on the factors influencing the selection of the appropriate cutting method based on the requirements for products, as well as the opportunities arising from the nature of the technology used in the right way affecting the workpiece.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2013, 14, 3; 833-843
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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