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    Wyświetlanie 1-6 z 6
    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:
    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:
    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:
    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:
    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
      Wyświetlanie 1-6 z 6

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