Temat: plasma - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Temporal distribution of linear densities of the plasma column in a plasma focus discharge
Autorzy:: Cikhardtova, B.
Kubeš, P.
Cikhardt, J.
Paduch, M.
Zielinska, E.
Kravárik, J.
Řezáč, K.
Kortanek, J.
Šíla, O.
Tematy:: plasma focus (PF)
plasma pinch
plasma diagnostics; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/147356.pdf Link otwiera się w nowym oknie
Opis:: Experiments were carried out on the PF-1000 plasma focus device, with a deuterium filling and with deuterium puffing from a gas-puff nozzle placed on the axis of the anode face. The current was reaching 2 MA. 15 interferometric frames from one shot were recorded with a Nd:YLF laser and a Mach–Zehnder interferometer, with 10–20 ns delay between the frames. As a result, the temporal and spatial distribution of the linear densities and the radial and axial velocities of the moving of plasma in the dense plasma column could be estimated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Diagnostic of temperature distribution in the chamber of GA plasma reactor
Autorzy:: Diatczyk, J.
Pawłat, J.
Stryczewska, H. D.
Tematy:: plasma diagnostic
non-thermal plasma
plasma reactors; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/123751.pdf Link otwiera się w nowym oknie
Opis:: Different diagnostic methods can be used to determine electrons and gas temperatures in the gliding arc plasma reactor. The electrons’ temperature has been determined by optical spectroscopy and gas temperature – by thermovision camera. The results of the thermovision diagnostics of the plasma generated by gliding arc for different process gases and their flow rates are presented and discussed in the paper.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Study of low temperature inactivation of spores using microwave excited air plasma
Autorzy:: Nagatsu, M.
Singh, M. K.
Zhao, Y.
Fujioka, Y.
Ogino, A.
Tematy:: plasma sterilization
low temperature plasma
microwave plasma
air plasma
VUV
radicals; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/385185.pdf Link otwiera się w nowym oknie
Opis:: In the present study, we investigated the inactivation characteristics and contribution of different inactivating factors generated in a low temperature and low pressure nitrogen, oxygen and air-simulated plasma for the inactivation of Geobacillus stearothermophilus spores. We used three optical filters i.e. thin quartz (lambda>180 nm), lithium fluorine (LiF, lambda>120 nm) and Pyrex glass (lambda>300 nm) plates to identify the most efficient wavelength range. The effect of optical radiations alone was studied through placing a small isolated and evacuated chamber with spore sample inside the plasma chamber.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Pinch modes in the SPEED2 plasma focus
Autorzy:: Kies, W.
Decker, G.
Berntien, U.
Sidelnikov, U.
Glushkov, D.
Koshelev, K.
Simanovskij, D.
Bobashev, S.
Tematy:: pinch plasma
pinch stability
plasma focus
plasma radiation
radiation source; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146993.pdf Link otwiera się w nowym oknie
Opis:: Deuterium discharges in the SPEED2 plasma focus (80 kJ, 200 kV, 2 MA, 400 ns) have been found unexpectedly stable within the operational regime as a neutron source. Only at higher filling pressures (above 6 mbar) sometimes m=0 instabilities appeared in the pinch column, especially in discharges of lower efficiency (moderate dynamics and neutron yield). Enhancing the electromagnetic radiation by doping these discharges with heavy gases (e.g. neon, argon) distinctly two pinch modes are produced, the micropinch mode (MPM) or the stable column mode (SCM), with a transition regime where the initial SCM is followed by the MPM. Micropinches are local radiative collapses initiated by m=0 instabilities of low-energy- density pinch plasmas. These instabilities and the successive micropinches can be suppressed by kinetic deuterons produced during dynamical compression of high-energy-density deuterium plasma sheaths. Depending on the relaxation of this fast deuteron component the pinch column can be stabilized for several tens of nanoseconds. While the short-lived (appr. 1 ns) micropinches erratically appear as point-like successive flashes along the pinch axis with temperatures about 1 keV and about solid density the reproducible SCM, optimized with respect to the compression ratio, forms a powerful linear radiation source of temperatures and densities similar to the MPM. The SCM needs powerful (fast) drivers in order to use the kinetic ion stabilization, but not necessarily MA currents as available from the SPEED2 driver. This opens the possibility to establish the SCM also in compact experiments like SPEED3 (8 kJ, 80 kV, 0.8 MA, 300 ns) or even SPEED4 (2 kJ, 40 kV, 250 kA, 300 ns).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Modelling of new generation plasma optical devices
Autorzy:: Litovko, I. V.
Goncharov, A. A.
Dobrovolskiy, A. N.
Naiko, L. V.
Naiko, I. V.
Tematy:: anode layer
plasma lens
plasma accelerator
plasma jet
space charge; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/971496.pdf Link otwiera się w nowym oknie
Opis:: The paper presents new generation plasma optical devices based on the electrostatic plasma lens configuration that opens a novel attractive possibility for effective high-tech practical applications. Original approaches to use of plasma accelerators with closed electron drift and open walls for the creation of a cost-effective low-maintenance plasma lens with positive space charge and possible application for low-cost, low-energy rocket engine are described. The preliminary experimental, theoretical and simulation results are presented. It is noted that the presented plasma devices are attractive for many different applications in the state-of-the-art vacuum-plasma processing.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Non - homogeneities in multi - element plasmas
Autorzy:: Pawelec, E.
Tematy:: plasma spectroscopy
wall-stabilized arc
demixing in plasma
plasma modeling; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146398.pdf Link otwiera się w nowym oknie
Opis:: This work presents the results of modeling and measurements of plasma parameters performed in a wall -stabilized arc working in a mixture of gases. The temperature and composition of the plasma are analyzed and the homogeneity of the plasma along the arc column in different gas mixtures is studied.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Plasma reforming of liquid hydrocarbon in plasma - liquid systems
Autorzy:: Chernyak, V.
Nedybaliuk, O.
Martysh, E.
Olszewski, S.
Solomenko, O.
Shchedrin, A.
Levko, D.
Demchina, V.
Kudryavzev, V.
Tematy:: plasma reforming
plasma chemical technologies
chemical conversion
plasma liquid systems; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146464.pdf Link otwiera się w nowym oknie
Opis:: This paper presents the results of an experimental study of plasma-assisted reforming of ethanol into molecular hydrogen in a modified tornado type electrical discharge. Plasma acts as a catalyst and initiates fast chain reactions that do not progress under normal conditions. Passivation of the electrodes in the discharge chamber during the discharge operation prevents their erosion and increases the working time of the reactor.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Electrode erosion mechanism in the rod plasma injector type of generator as deduced from the structure of irradiated substrates
Autorzy:: Piekoszewski, J.
Stanisławski, J.
Grotzschel, R.
Matz, W.
Jagielski, J.
Szymczyk, W.
Tematy:: plasma alloying
plasma melting
vapor ionization; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/147032.pdf Link otwiera się w nowym oknie
Opis:: Titanium atoms were alloyed into a polycrystalline alundum substrate using a various number of intense pulses consisting of plasma of the working gas and vapor and low energy ions of Ti eroded from electrodes of the rod plasma injector type generator. It appears that at a single pulse titanium always forms a thin metallic film not mixed with the substrate material. With increasing number of pulses the amount of titanium atoms mixed into the substrate increases, whereas the thickness of the film - decreases. Analyses of phase composition and of structural properties, as well as computer simulations of thermal evolution brought the present authors to the conclusion that increase of number of pulses leads to decrease of melting temperature of the top layer of the substrate. It has also been confirmed that metallic ions eroded from electrodes do not undergo such acceleration like working gas ions do; their energy remains on the 200-300 eV level. It is concluded that erosion of the electrode material occurs during the last phase of the discharge via the vacuum arc mechanism.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Studies of interaction of plasma jets generated in a plasma focus facility with an ambient plasma in external magnetic field
Autorzy:: Filippov, N.
Filippova, T.
Filippov, A.
Friart, D.
Karakin, M.
Khautiev, E.
Krauz, V.
Mokeev, A.
Myalton, V.
Nikulin, S.
Simonet, F.
Tykshaev, V. P.
Vierne, J.
Vinogradov, V. P.
Tematy:: collisionless shocks
plasma focus
plasma jets; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/147551.pdf Link otwiera się w nowym oknie
Opis:: The aim of the present experiments was to reproduce and to study in laboratory quasi-perpendicular supercritical collisionless shocks similar to the Earth-Solar Wind shock, by using a plasma focus facility as the plasma source. The experiments were performed on the PF-3 facility (Filippov-type plasma focus) at a level of energy supply of about 1 MJ. Directed plasma jets are produced with axial velocities ~107 cm/s after compression of a plasma-current sheath in the initial stage of plasma focus formation. These jets then travel through an ambient plasma resulting in early gas ionization by X-ray radiation from the plasma focus, and at an angle of 90° to the 2500 G external magnetic field applied by a system based on rear-earth magnets. Our experimental conditions allowed us to reach a range MA ~ 5÷10.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Studies of plasma interactions with tungsten targets in PF-1000U facility
Autorzy:: Ladygina, M. S.
Skladnik-Sadowska, E.
Zaloga, D. R.
Sadowski, M. J.
Kubkowska, M.
Kowalska-Strzeciwilk, E.
Krawczyk, N.
Paduch, M.
Miklaszewski, R.
Garkusha, I. E.
Tematy:: plasma-surface interaction
plasma streams
tungsten
plasma focus
PF-1000U; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/147524.pdf Link otwiera się w nowym oknie
Opis:: This paper presents results of experimental studies of tungsten samples of 99.95% purity, which were irradiated by intense plasma-ion streams. The behaviour of tungsten, and particularly its structural change induced by high plasma loads, is of great importance for fusion technology. The reported measurements were performed within a modifi ed PF-1000U plasma-focus facility operated at the IFPiLM in Warsaw, Poland. The working gas was pure deuterium. In order to determine the main plasma parameters and to study the behaviour of impurities at different instants of the plasma discharge, the optical emission spectroscopy was used. The dependence of plasma parameters on the initial charging voltage (16, 19 and 21 kV) was studied. Detailed optical measurements were performed during interactions of a plasma stream with the tungsten samples placed at the z-axis of the facility, at a distance of 6 cm from the electrode outlets. The recorded spectra showed distinct WI and WII spectral lines. Investigation of a target surface morphology, after its irradiation by intense plasma streams, was performed by means of an optical microscope. The observations revealed that some amounts of the electrodes material (mainly copper) were deposited upon the irradiated sample surface. In all the cases, melted zones were observed upon the irradiated target surface, and in experiments performed at the highest charging voltage there were formed some cracks.
Dostawca treści:: Biblioteka Nauki

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