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  • 1
    Electronic Resource
    Electronic Resource
    Dependence of the emission characteristics of magnetized surface-wave plasmas on the azimuthal configuration of the wave field (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 4211-4218 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A 1D plasma-wave model initially developed for describing a plasma sustained by a surface wave in the azimuthally symmetric configuration (m=0) was modified for simulating surface waves in the dipolar mode (m=1). Using this model, it is shown that the maintenance limit for unmagnetized plasmas in the symmetric mode, which, as was previously determined, requires that the product of the wave frequency and the plasma radius be smaller than 2 GHz cm, is no longer valid for magnetized plasmas. Comparison of calculated and measured radial distributions of argon atoms in a radiative excited state shows that changes observed in this distribution when varying some of the operating conditions can be explained by a switching of the discharge from one mode to the other. Conditions for selection of the mode are derived from considerations on wave propagation and power dissipation along the plasma column. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366224
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  • 2
    Electronic Resource
    Electronic Resource
    Analytical formulation of ionization source term for discharge models in argon, helium, nitrogen, and silane (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 4533-4537 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Simple analytical representations of the ionization source terms in argon, helium, nitrogen, and silane dc glow discharges for steady-state and quasisteady-state conditions are presented. These analytical forms express well the highly nonequilibrium nature of the ionization in the cathode fall and negative glow regions which cannot be described by a Townsend ionization coefficient depending on the local value of the reduced electric field. These source terms can be easily incorporated into fluid models of gas discharges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352107
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  • 3
    Electronic Resource
    Electronic Resource
    The radial structure of a magnetically confined surface-wave plasma column (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 1754-1769 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The radial structure of a steady-state surface-wave-sustained cylindrical argon plasma submitted to a static, axial magnetic field is described in the context of a hydrodynamic model using three-moment equations for electrons and two-moment equations for ions. This plasma model is coupled self-consistently to Maxwell's equations and yields the radial profile of the electron density and temperature, as well as the radial distribution of excited species, in the 3p56d orbital configuration of argon. In this paper, the discussion focuses on the radial structure of the plasma as a function of the operating conditions (magnetic field intensity, gas pressure, wave frequency, plasma tube radius). It is found that the electron density profile is, generally, weakly modified, as these parameters are changed. In contrast, the electron temperature profile and, consequently, the excited atom density distribution are very sensitive functions of the operating conditions. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871694
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  • 4
    Electronic Resource
    Electronic Resource
    The breakdown and glow phases during the initiation of discharges for lamps (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 112-119 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High intensity discharge (HID) lamps are often initiated by the application of one or more short, high-voltage, breakdown pulses superimposed on a 50 or 60 Hz generator voltage. A successful transition from the breakdown event to steady-state operating conditions in HID lamps requires that the lamp-circuit system be adequate to sustain the plasma created during breakdown until the electrodes are heated to thermionic temperatures. In this article, we use a one-dimensional (in the axial direction) transient discharge model to study the conditions needed to sustain the cold-cathode discharge after a breakdown event has occurred. While the application of our one-dimensional model to real lamps is approximate, we find that the model predictions are consistent with experimental results in HID lamps, a few of which are presented here. The main conclusion from this work is that, after breakdown, the voltage necessary to sustain a glow discharge is dependent on the source impedance, the gas composition, and on the plasma density created by the breakdown event. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366274
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  • 5
    Electronic Resource
    Electronic Resource
    Calculated Plasma Parameters and Excitation Spectra of High-Pressure Helium Discharges (1999)
    Springer
    Plasma chemistry and plasma processing 19 (1999), S. 467-486 
    Details
    ISSN: 1572-8986
    Keywords: He-plasma ; excitation spectra ; modeling ; comparison with experiments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract A collisional-radiative model was used to study the kinetics of an atmospheric pressure helium discharge. The electron kinetics was obtained from a two-term solution of the Boltzmann equation with electron–electron collisions included. The distribution of the helium electronic excited states was compared to measured values and used to calculate excitation temperatures. The results show that a unique value of the excitation temperature cannot be used to characterize the whole electronic states distribution, because the plasma is not in local thermodynamical equilibrium under the conditions considered. Other calculated discharge parameters, such as the electron temperature, the maintenance electric field, the density of metastable atoms in the 2 3 S state, and the ion densities are presented and compared to experimental data when available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021878309471
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  • 6
    Electronic Resource
    Electronic Resource
    Numerical Modeling of a He–N2 Capillary Surface Wave Discharge at Atmospheric Pressure (2000)
    Springer
    Plasma chemistry and plasma processing 20 (2000), S. 183-207 
    Details
    ISSN: 1572-8986
    Keywords: collisional-radiative model ; He–N2 plasma ; Boltzmann equation ; atmospheric pressure plasma ; surface wave
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract A self-consistent steady-state spatially averaged collisional-radiativemodel in which the rate coefficients involving electrons are calculatedfrom the solution to the electron Boltzmann equation has been developedfor describing an atmospheric pressure plasma in helium–nitrogen(He–N2) mixtures. The influence of small nitrogenconcentrations (typically less than 1%) on the discharge characteristicsis studied and compared with available experimental data. It is foundthat nitrogen is highly dissociated and that the density of metastablehelium atoms is considerably reduced by the presence of nitrogen, evenat such low concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007065022725
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