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    Wyświetlanie 1-10 z 10
    Tytuł:
    Peculiarities of Swift Proton Transmission through Tapered Glass Capillaries
    Autorzy:
    Komarov, F.
    Kamyshan, A.
    Pil'ko, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503781.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.35.+a
    Opis:
    A study of the 150-300 keV proton beam transmission through glass (borosilicate) tapered capillaries with different diameters of the input and output of the capillary was performed. The focusing effect was observed. The areal density of the transmitted beam is enhanced by approximately 20 times. It was shown that changing a taper angle from 0.5 deg to 1.7 deg evidences the increase of the transmission coefficient more than by 300 times keeping the initial energy spectrum of ions.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 16-18
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sputtering and Implantation of VV-6025X Surface with Slow Heavy Ions Monitored with PIXE
    Autorzy:
    Antoszewska, M.
    Balcerski, J.
    Brzozowski, R.
    Dolecki, K.
    Frątczak, E.
    Gwizdałła, T.
    Pawłowski, B.
    Moneta, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367499.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.35.+a
    61.80.Lj
    Opis:
    In this work the characteristic radiation, emitted during interaction of medium energy (200 keV) ambient heavy ions (Ar) with $Fe_{4}Co_{66}Si_{12}B_{14}Nb_{1}Mo_{2}Cu_{1}$ (VV-6025X) amorphous alloy, was measured in grazing incident-exit angle geometry and in time sequence, in order to determine dynamics of formation of subsurface region, damaged through implantation, sputtering and interface mixing. It was shown that structure and composition of surface is unstable against heavy ions irradiation due to preferential sputtering and implantation of ions, and recoils, and that the dynamics of such modification can be monitored in-situ with particle induced X-ray emission (PIXE) method.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 136-137
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ionisation Efficiency in Conical Hot Cavities
    Autorzy:
    Turek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033720.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.77.Ka
    07.05.Tp
    34.35.+a
    Opis:
    Surface ionisation in a new type of hot cavity characterised by the shape of a truncated cone is considered in the paper. Influence of the hot cavity shape and its temperature on the ionisation efficiency of stable and long-lived nuclides is under investigation and the supremacy of elongated conical cavities is proven. The role of the extraction opening size is studied and its optimal diameter ( ≈ 1 mm) is found for the considered cavity shapes. It is shown that the extraction voltages of 1-2 kV are large enough to obtain high efficiencies and saturation of the current-voltage curves is observed above these values. Changes of ionisation effciency with the ioniser temperature are investigated - increase of ion yield with T is observed. It was proven that cold spots inside the ioniser cavity (near the extraction opening - in the considered case) can degrade ion source performance by several tens percent.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 259-263
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of Ionization in a Spherical Surface Ionizer
    Autorzy:
    Turek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504138.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.77.Ka
    07.05.Tp
    34.35.+a
    Opis:
    A Monte Carlo method-based model of a hot cavity surface ion source with a spherically shaped ionizer is presented. A numerical code enables studies of ion source efficiency as a function of an extraction voltage, geometry of the ionizer and its temperature, the size of extraction aperture and many other factors. The calculation results for a variety of mentioned parameters are presented. A novel configuration of surface ion source is proposed and discussed - the efficiency of the source with an almost spherically shaped ionizer could be much higher than that of currently used constructions of ion sources.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 188-191
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Electron Impact on Ionization of Short-Lived Isotopes in a Hot Cavity
    Autorzy:
    Turek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1199206.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.77.Ka
    07.05.Tp
    34.35.+a
    Opis:
    A Monte Carlo method based numerical model of hot cavity surface ion source that takes into account radioactive decay and the delay due to the sticking of particles to ionizer surface is considered. The influence of electron impact ionization by thermionic electrons accelerated by the extraction field is investigated. It is shown that the contribution from that process rises with decreasing half-life period and cannot be neglected, especially for substances of small surface ionization coefficient. The changes of relative yields from electron impact and surface processes with the length of the average sticking time are also studied.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1384-1387
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Ionization of Radioactive Nuclides - Numerical Simulations
    Autorzy:
    Turek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400445.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.77.Ka
    07.05.Tp
    34.35.+a
    Opis:
    The Monte Carlo method based model of the ionization in the hot cavity taking into account radioactive decay of nuclides is presented. The code upgraded compared to the previous version enables calculation of the ion source ionization efficiency not only for different geometries and temperatures of the ionizer, extraction voltages etc. but also gives opportunity of setting different values of the nuclide half-life and its sticking time, which may be considered as the main factor determining the time that a particle spends in the ion source. The results of calculations are presented together with the discussion of the radioactive decay on the ion source performance.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 847-850
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ionization of Short-Lived Isotopes in Spherical Hot Cavities
    Autorzy:
    Turek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402238.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.77.Ka
    07.05.Tp
    34.35.+a
    Opis:
    The numerical model of ionization of short-lived nuclides in spherical hot cavities is presented. Two different cavity configurations are considered: one of them (the hemispherical one) resembles that known from already existing ion sources while the other (closer to the full sphere) could be more efficient for short-lived isotopes. Changes of ionization efficiency with the half-life period as well as with the particle average sticking time are presented and discussed. Influence of the extraction opening radius on ionization efficiency is also under investigation.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 935-938
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interface Properties of Single and Bi-Layer $Fe_3O_4$ Films Grown on MgO(001) Studied by RBS and Channeling Experiments
    Autorzy:
    Kim-Ngan, N.
    Balogh, A.
    Brötz, J.
    Zając, M.
    Korecki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535628.pdf
    Data publikacji:
    2010-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.35.+a
    68.35.Ct
    68.35.Fx
    68.47.Gh
    Opis:
    Series of $Fe_3O_4$/MgO(001) and $Fe_3O_4$/Fe/MgO(001) films (single- and bi-layer films, respectively) with a total layer thickness in the range of 20 ÷ 150 nm were investigated by the Rutherford backscattering spectrometry (2 MeV $He^{+}$ ion beam), by the Rutherford backscattering spectrometry channeling experiments (1.5 MeV $He^{+}$ ion beam). Depending on the layer thickness of each layer and the film geometry, a single Fe peak and/or a double-anomaly feature was revealed in the Rutherford backscattering spectra. For all films no magnesium presence in the surface layer was observed. For both single- and bi-layer films with a total layer thickness less than 60 nm only one minimum was observed in the channeling curves, while a double minimum was revealed for the bi-layer films with a larger thickness. X-ray reflectometry measurements have revealed that the film density is the same as that of the bulk one.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 4; 570-575
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-Dimensional Simulations of H¯ Ions Extraction
    Autorzy:
    Turek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030213.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.77.Ka
    07.05.Tp
    34.35.+a
    41.75.Ak
    41.75.Cn
    Opis:
    The 2D particle-in-cell method based model of a negative ion source is presented. The spatial distributions of electrostatic potential and plasma component densities are presented. Changes of negative ion distribution and potential as well as the extracted H¯ current with the plasma grid bias voltage are investigated. The presence of the potential well near the plasma grid surface that traps the negative ions is shown. Increase of the H¯ ions density inside the chamber with the negative bias voltage is demonstrated. Influence of the H¯ ion flux outgoing from the plasma grid on the extracted current was checked: increase by factor 2 is observed when the flux rises 4 times. Current-voltage characteristics of the ion source are presented, saturation of the curve is observed above 50 kV.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 254-258
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculations of Ion Beam Emittance for Hot Cavity Ion Source
    Autorzy:
    Turek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402237.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.77.Ka
    07.05.Tp
    34.35.+a
    41.75.Ak
    41.75.Cn
    Opis:
    Emittance of short-lived nuclide beams produced in hot cavity ion sources is calculated. Influence of half-life period as well as the average sticking time on beam emittance is under investigation. Two different shapes of ionizer cavity are considered: almost fully spherical and hemispherical ones. Changes of beam emittance due to the extraction channel geometry (its diameter and length) are studied. A new concept of scaled efficiency (ion source brightness analogon) is introduced in order to compare the two-ion source configurations. Phase space portraits of the extracted beams are presented.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 931-934
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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