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    Wyświetlanie 1-4 z 4
    Tytuł:
    Time Delay in Thin Dielectric Slabs with Saturable Nonlinearity
    Autorzy:
    Beličev, P.
    Ilić, I.
    Radovanović, J.
    Milanović, V.
    Hadžievski, Lj.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808066.pdf
    Data publikacji:
    2009-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Xp
    41.20.Jb
    42.25.Bs
    42.70.Nq
    Opis:
    Time delays for an intense transverse electric wave propagating through a slab with saturable nonlinearity are investigated. The nonlinearity is assumed in a form of the Vinetskii-Kukhtarev model, which is relevant for the slabs made of nonlinear photorefractive crystals, such as GaAs and $LiNbO_3$, which feature a saturable nonlinearity. The expressions for the group delay and the dwell time are derived and the relation between them is studied. It is shown that the difference between them has three different contributions. The first one corresponds to the self-interference associated with the dispersion of the medium surrounding the slab. The other two appear due to the nonlinearity of the slab and oblique incidence of the transverse electric wave. All the results are compared with the case of dielectric slabs with cubic (Kerr) nonlinearity.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 4; 834-837
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Goos-Hänchen Shift on Tunneling Times in Dispersive Nonlinear Media
    Autorzy:
    Ilić, I.
    Beličev, P.
    Milanović, V.
    Radovanović, J.
    Hadžievski, Lj.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795625.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Xp
    42.25.Bs
    42.65.Hw
    78.20.Ci
    Opis:
    The Goos-Hänchen effect is an optical phenomenon defined as a displacement of the reflected beam of linearly polarized light after the total internal reflection, which occurs perpendicularly to the direction of propagation. Due to this effect, when an optical wave propagates through a barrier, tunneling times may change accordingly. In this paper, we consider the impact of the Goos-Hänchen effect on group delay and dwell time for electromagnetic wave propagating through a nonlinear dispersive slab placed inside linear dispersive surroundings. Numerical calculations are performed for the special case, namely a double negative index metamaterial embedded into a material with a saturable nonlinearity, when a background medium is vacuum. The numerical results for tunneling times are calculated when the Goos-Hänchen effect is observed. It is shown that this approach gives more accurate expressions for tunneling times when the angle of incidence has a non-zero value.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 638-641
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Status report of the VINCY Cyclotron
    Autorzy:
    Nešković, N.
    Ristić-Ðurović, J.
    Vorojtsov, S. B.
    Belicev, P.
    Ivanenko, I. A.
    Ćirković, S.
    Vorozhtsov, A. S.
    Bojović, B.
    Dobrosavljević, A.
    Vujović, V.
    Comor, J. j.
    Pajović, S. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/146191.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    accelerators
    cyclotrons
    ion sources
    radioisotopes
    radiation research
    Opis:
    The VINCY Cyclotron is the main part of the TESLA Accelerator Installation. The diameter of the pole of this machine is 2000 mm. Its bending constant is 145 MeV while its focusing constant is 75 MeV. The radiofrequency system of the machine consists of two l/4-resonators with the eigenfrequency in the range from 17 to 31 MHz. Ions coming from a heavy ion source or a light ion source will be injected into the machine axially. They will be introduced into its median plane by a spiral inflector. Heavy ions accelerated in the machine will be extracted from it by a foil stripping system or by an electrostatic deflection system. Light ions will be extracted from it by the foil stripping system. The first programs of use of the VINCY Cyclotron are related to routine and experimental production of radioisotopes and radiopharmaceuticals, and to biomedical research with ion beams. The first beam extracted from the machine will be the proton beam of the energy of 22 MeV obtained from the H2+ beam extracted from the light ion source. This beam will be used first for production of radioisotope 18F and radio-pharmaceutical 18FDG, to be employed for positron emission tomography
    Źródło:
    Nukleonika; 2003, 48,suppl.2; 135-139
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of the 2nd Harmonic ECR Micro Plasma Sources by Using PIC/MCC Simulations
    Autorzy:
    Radmilović-Radjenović, M.
    Radjenović, B.
    Beličev, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419747.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.25.Os
    52.65.-y
    Opis:
    In this paper we have presented our simulation studies of 2.4 GHz microwave plasma production under the electron cyclotron resonance with an idea to expand the plasma generation conditions into the much lower pressure range and much shorter gap length. As the first for this purpose, we have focused on the influences of applied magnetic field, gas pressure and gap length on the breakdown and maintenance of plasmas. Calculations were performed by using a one-dimensional particle-in-cell/Monte Carlo collisions code with three velocity components. The obtained simulation results are in a good agreement with the available experimental data providing an insight into the resonant electron acceleration for ECR condition and the resonant electron confinement for the 2nd harmonic ECR. In addition, analytical expressions for the breakdown voltage and the trapping field have been derived.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 128-131
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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