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    Wyświetlanie 1-12 z 12
    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
    Tytuł:
    Numerical Analysis of Metal-Cylinder-Based Microwave Plasma Module
    Autorzy:
    Sobański, M.
    Jasiński, M.
    Mizeraczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366115.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.80.hp
    84.40.-x
    52.35.Hr
    84.40.Dc
    02.70.Dh
    88.30.E-
    52.65.-y
    52.50.Dg
    11.55.-m
    52.40.Fd
    84.40.Az
    Opis:
    We present optimization of energy transfer in the waveguide-supplied metal-cylinder-based microwave plasma module with an inner cylindrical quartz tube. The construction of microwave plasma module is based on a WR 340 waveguide standard. Presented microwave plasma module operates at atmospheric pressure and frequency of 2.45 GHz. There is a reduced height section waveguide in microwave plasma module which provides local increase of the electric field in the plasma region. Microwave plasma module is terminated with a movable plunger which plays the role of the tuning element. Tuning characteristics of microwave plasma module are defined as the dependence of the $P_{R}$/$P_{I}$ on the position $l_{s}$ of the movable plunger, where $P_{R}$ and $P_{I}$ are the microwave power reflected and power incident, respectively. The powers $P_{R}$ and $P_{I}$ are measured in the input plane of microwave plasma module. The purpose of the presented optimization is to achieve $P_{R}$ lower than 5% of $P_{I}$ in widest range of position of movable plunger $l_{s}$. We used Comsol Multiphysics software to make numerical analysis which allows to optimize the parameters of microwave plasma module. Results of numerical analysis show that $P_{R}$/$P_{I}$ is lower than 0.05 in a wide range of movable plunger position $l_{s}$.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1309-1311
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport Coefficients For Electrons in Mixtures $CF_4$/Ar/$O_2$ and CF, $CF_2$ or $CF_3$ Radicals
    Autorzy:
    Nikitović, Ž.
    Stojanović, V.
    Radmilović-Radjenović, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503491.pdf
    Data publikacji:
    2011-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    51.10.+y
    52.20.-j
    52.65.Pp
    52.65.Rr
    52.77.-j
    Opis:
    Transport coefficients for electrons in mixtures of $CF_{4}$ with Ar and $O_{2}$ for ratios of the electric field to the gas number density E/N from 1 Td to 1000 Td ($1Td=10^{-21} V m^2$) are presented. The analysis of non-conservative collisions revealed a range of the reduced electric field E/N where electron attachment introduced by radicals significantly changes electron kinetics obtained for mixtures without dissociation of $CF_{4}$ gas. The results obtained by using a simple, Two Term solutions for Boltzmann's equation are verified by Monte Carlo simulations. It was found that three body attachments for oxygen is not significant for pressures that are standard in plasma etching equipment i.e. below 1 Torr. Furthermore, the attachment to CF, $CF_{2}$ and $CF_{3}$ at low mean energies is significant, several orders of magnitude. At the same time the mean energy and energy distribution functions for the given E/N are the same as in unperturbed gas mixture. The large changes of the attachment rate are sufficient to change the nature of plasmas and turn them into ion-ion plasmas with very few electrons for realistic abundances.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 2; 289-291
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    H⁺ Scattering in n-Butanol
    Autorzy:
    Nikitović, Ž.
    Raspopović, Z.
    Stojanović, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032572.pdf
    Data publikacji:
    2017-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    51.10.+y
    52.20.Hv
    52.65.Pp
    Opis:
    In this paper we show predictions for the low energy cross-sections and transport properties for the H⁺ in n-butanol gas. These data are needed for modelling in numerous technologically important applications. Appropriate gas phase enthalpies of formation for the products were used to calculate scattering cross-section as a function of kinetic energy. Calculated cross-sections can be used to obtain transport parameters as a function of E/N (E - electric field, N - gas density) for H⁺ in n-butanol gas.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 4; 1420-1423
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rate Coefficients of $F^{-}$ Ions in $Ar//BF_{3}$ Mixtures
    Autorzy:
    Nikitović, Ž.
    Stojanović, V.
    Raspopović, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400505.pdf
    Data publikacji:
    2015-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    51.10.+y
    52.20.Hv
    52.65.Pp
    Opis:
    Transport parameters of $F^{-}$ ions in mixtures $Ar//BF_{3}$ in DC fields were calculated using Monte Carlo simulation technique assuming the scattering cross-section set assembled on the basis of Nanbu's technique separating elastic from reactive collisions. In this work we present characteristic energy and rate coefficients for low and moderate reduced electric fields E/N (N - gas density) and account for the non-conservative collisions.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 6; 1634-1636
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cross-section and transport parameters of Ne⁺ in CF₄
    Autorzy:
    Nikitović, Ž.
    Stojanović, V.
    Raspopović, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058180.pdf
    Data publikacji:
    2016-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    51.10.+y
    52.20.Hv
    52.65.Pp
    Opis:
    A cross-section set for scattering Ne⁺ ions in CF₄ is assessed by using available experimental data for charge transfer cross-sections. In this paper we present new results for the mean energy, reduced mobility and diffusion coefficients for low and moderate reduced electric fields E/N (N - gas density) and account for the non-conservative collisions. The Monte Carlo method is used to calculate transport properties of Ne⁺ ions in CF₄ at temperature of T=300 K.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 6; 1343-1345
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of Electron Kinetics in $BF_{3}$
    Autorzy:
    Nikitović, Ž.
    Šašić, O.
    Raspopović, Z.
    Stojanović, V.
    Radovanov, S.
    Mozetič, M.
    Cvelbar, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537846.pdf
    Data publikacji:
    2010-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    51.10.+y
    52.20.Fs
    52.65.Pp
    Opis:
    In this paper we used the available data for the electron impact scattering cross sections $BF_{3}$ to calculate the transport coefficients for electrons. Monte Carlo simulation was used to perform calculations of the transport coefficients as well as the rate coefficients in DC electric fields, crossed electric and magnetic DC and RF fields.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 5; 748-751
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport Parameters of $F^-$ Ions in $BF_3$
    Autorzy:
    Nikitović, Ž.
    Stojanović, V.
    Raspopović, Z.
    Jovanović, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205173.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    51.10.+y
    52.20.Hv
    52.65.Pp
    52.77.-j
    Opis:
    In this work we presented the new results for energy dependent cross-sections and transport coefficients as a function of E/N for $F^-$ ions in $BF_3$ gas. Results were obtained by using the Monte Carlo technique for cross-section set determined on the basis of the Nanbu theory. Monte Carlo method is applied to obtain swarm parameters at temperature of T=300 K.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 3; 724-726
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport Coefficients in Mixtures $Ar//H_2$
    Autorzy:
    Nikitović, Ž.
    Stojanović, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400294.pdf
    Data publikacji:
    2013-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    51.10.+y
    52.20.Hv
    52.65.Pp
    52.77.-j
    Opis:
    In this work we present electron transport coefficients for electrons in $Ar//H_2$ mixtures for the conditions used in plasma assisted technologies for semiconductor production i.e. in moderate to very high reduced electric field E/N (E - electric field, N - gas density). We used a two term numerical solution of the Boltzmann equation at the lowest E/N and mean energies and also Monte Carlo simulation technique at moderate and high E/N. We show that a good agreement with experimental data exists for low and moderate E/N and that based on the tests for pure $H_2$ and Ar we can model properly the high E/N development. Results were obtained for abundances of $H_2$ from 1% to 50%. Such data are required to test the sets of cross-section data which are necessary in kinetic models for this mixture and also to produce transport coefficients for fluid models. Hydrogen is used for etching of organic compounds, most importantly low k dielectrics, at the same time argon as a buffer gas is added to control the mean energy and distribution function. Besides, operation at high E/N allows the generation of fast neutrals for charging free etching on nanometer scales.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 1; 73-75
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cross-Sections and Transport Properties of $F^{-}$ Ions in $F_2$
    Autorzy:
    Stojanović, V.
    Nikitović, Ž.
    Jovanović, J.
    Raspopović, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205818.pdf
    Data publikacji:
    2014-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    51.10.+y
    52.20.Hv
    52.65.Pp
    52.77.-j
    Opis:
    We present the new results for the simple scattering cross-section set and proposed transport coefficients for $F^{-}$ ions in $F_2$ that can be used in such models. Nanbu's theory based on thermodynamic threshold energies and separating elastic and reactive collisions is used to calculate cross-sections for binary collisions of ions with atoms and molecules. Direct MC method is applied to obtain swarm parameters at temperature of T = 300 K.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 1; 46-48
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of Excitation by Heavy Particles in Pure $H_2$ Discharges at High E/N
    Autorzy:
    Stojanović, V.
    Nikitović, Ž.
    Powiązania:
    https://bibliotekanauki.pl/articles/1489837.pdf
    Data publikacji:
    2012-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    51.10.+y
    52.20.Hv
    52.65.Pp
    52.77.-j
    Opis:
    $H_{α}$ emission profiles were calculated for the high E/N (electric field E to gas density N ratio) Townsend discharges in pure hydrogen. Heavy particle collisions including the fast neutrals and interactions with the cathode surface are also included. The basic data were chosen to be in accordance with those used by Phelps. Monte Carlo simulation technique employing null collision method was used to follow electrons and heavy particles between collisions with $H_2$ or with surface for the conditions of a high E/N. Trajectories of reaction fragments are followed after the collision until their neutralization or thermalization down to the threshold of $H_{α}$ excitation. We obtained spatially resolved emission profiles and the Doppler broadened line profiles for the conditions of the experiment of Petrović and Phelps. Intensity of the Doppler profile wing showing $H_{α}$ emission of particles emerging from the cathode direction is obtained assuming that the reflection coefficient of the fast H atoms depends on the incident angle and on energy of the incident particle.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 3; 622-624
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model of Dynamical Correlation in Two-Ionic Strong Coupling Plasmas
    Autorzy:
    Chohra, T.
    Chenini, K.
    Meftah, M.
    Boukraa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807779.pdf
    Data publikacji:
    2009-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.20.Dq
    52.65.Cc
    47.40.Nm
    05.20.-y
    Opis:
    The dynamics of an impurity ion of charge $q_{0}$ embedded in a two-component ionic plasma is represented as that of a particle in a random medium. The effect of the surroundings on the impurity is represented by a memory function whose form is proposed in this work. Our choice stands for the strongly coupled plasma for which the memory function has an oscillatory behavior with the plasma frequency. The model therefore describes the plasma in the strong coupling limit. We first derive a master equation governed by this memory function and, with the help of the Laplace transform, we solve it via a quartic algebraic equation. We calculate in the end the dynamical properties, i.e. the autocorrelation functions which are very useful in many areas of plasma physics as in radiative transport and in spectral line shape broadening theories.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 2; 193-196
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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