Temat: laser plasma - Prolib Integro

Skocz do pozycji: 1.

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.
Tematy:: laser plasma
photoionized plasma
surface treatment
nanostructures; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1030617.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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.
Tematy:: intense laser pulses
ultra-short laser pulse
laser plasma
plasma acceleration; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/147890.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Numerical simulations of generation of high-energy ion beams driven by a petawatt femtosecond laser
Autorzy:: Domański, J
Badziak, J.
Jabłoński, S.
Tematy:: laser acceleration
laser plasma
ions
particle-in-cell simulations; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146458.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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.
Tematy:: femtosecond pulses
high-power laser
inertial confinement fusion
laser plasma; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146603.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Proton emission from laser - generated plasmas at different intensities
Autorzy:: Torrisi, L.
Cutroneo, M.
Cavallaro, S.
Giuffrida, L.
Margarone, D.
Tematy:: laser-generated plasma
proton acceleration; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146370.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

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.
Tematy:: post ion acceleration
laser plasma
ion beam
ion implantation; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146658.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

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
Tematy:: extreme ultraviolet
EUV
laser plasma
low pressure
photoionization
plasma
soft X-ray
SXR; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/2202566.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Post-acceleration of ions from the laser-generated plasma
Autorzy:: Giuffrida, L.
Torrisi, L.
Tematy:: laser ablation
laser-plasma
post-acceleration
ion implantation
Rutherford backscattering spectrometry (RBS) analysis; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146664.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Laser-induced ablation: physics and diagnostics of ion emission
Autorzy:: Torrisi, L.
Tematy:: laser-generating plasma
Boltzmann distribution
time-of-flight; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146624.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Pulsed laser induced potassium oxide plasma analyzed by optical emission spectrum technique
Autorzy:: Khalaf, Madyan A.
Tematy:: Laser - Induced Plasma (LIP)
Nd:YAG laser
Optical Emission Spectroscopic
potassium oxide plasma; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/1193329.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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