Electromagnetic Field in Electrodeless Discharge

Henriksen, Bruce B.; Keefer, Dennis; Clarkson, M. H.

doi:10.1063/1.1659964

Cited by 19 publications

(10 citation statements)

References 4 publications

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“…This was taken into consideration by Eckert [9]. Henrikson et al found a unified solution to the electrodynamic differential equations under the assumption of a parabolic distribution of the electric conductibility [10]. However, by considering such a profile, the variation of the ring discharge geometry becomes evident (e.g.…”

Section: Introductionmentioning

confidence: 99%

High-enthalpy, water-cooled and thin-walled ICP sources characterization and MHD optimization

Herdrich¹,

Petkow²

2008

J. Plasma Phys.

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The development of the inductively driven plasma wind tunnel PWK3, which enables the electrodeless generation of high-enthalpy plasmas for the development of heat shield materials required for space vehicles performing entry manoeuvres in the atmospheres of Venus, Earth and Mars, is described. The facility with its modular inductive plasma generators allows operation with gases such as carbon dioxide, air, oxygen and nitrogen and was qualified for thermal plasma powers up to 60 kW. Previously developed models for determining plasma properties and plasma source related characteristics enable a maximum plasma power in combination with long operational periods using different operational gases and gas mixtures. This is achieved by an optimization using the optimum operational frequency, a minimization of field losses using very thin plasma tube wall thicknesses and the successful application of MHD effects. Based on the solved cylinder problem for ICPs, a one-dimensional model for radial Lorentz forces and magnetic pressure has been developed. Here, a synthesis of previously published data and works is made where the new algebraic model for the calculation of Lorentz forces and magnetic pressures in an ICP was used and applied to experimental data. In addition, results from the model using the experimental data are shown to be consistent and, in addition, a comparison with a simpler model based on the well-known exponential approach for ICPs showed that the simpler model is covered without fail by the new model. The new model also states that there is a maximum of the Lorentz forces over the damping parameter d/δ (plasma diameter divided by skin depth) which almost corresponds with the position of the maximum plasma power of the cylindric model for ICPs. For the magnetic pressure the position of the maximum pressure is identical to the value for d/δ for the maximum plasma power.

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Section: Introductionmentioning

confidence: 99%

High-enthalpy, water-cooled and thin-walled ICP sources characterization and MHD optimization

Herdrich¹,

Petkow²

2008

J. Plasma Phys.

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“…Due to the growing interest in ICP, many works which devoted to the numerical study of the its characteristics have appeared. The nature of the distribution of the electromagnetic field in an inductive diffusive discharge was specified in the work of Henriksen et al [14]. There, the plasma conductivity was assumed to be complex and the radial distribution of the electron density was approximated by a quadratic parabolic function.…”

Section: Icp Simulationsmentioning

confidence: 99%

Frequency dependencies of the characteristics of an inductively coupled radiofrequency discharge at reduced pressure

Terentev¹,

Shemakhin²,

Самсонова³

et al. 2022

Plasma Sources Sci. Technol.

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The dependence of parameters of an inductively coupled RF plasma on the electromagnetic field frequency at reduced pressure (113 Pa) is studied. The study was carried out in a 2D axisymmetric time-dependent setting, implemented in the Comsol multiphysics software package using the Navier-Stokes equations, continuity equation for electron density, electron energy density equation, heat transfer equation, Maxwell and Poisson equations for electromagnetic fields. The distributions of the electron density, carrier gas temperature, electron temperature and ion density at the output of the discharge tube in dependence on electromagnetic field frequency are obtained.

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“…Eckert [265] used Bessel functions for the fields by including the average value of the electron density in Maxwell's equations, and a 'Schottky' radial profile [14] for the electron density to compute power deposition and impedance. Henriksen el al [273] found a closed-form solution for the electromagnetic fields assuming a parabolic density profile, and more recently Denneman [274] modelled lowpressure Ar-Hg discharges, again using a Schottky density profile and solving the coupled Maxwell equations numerically. For LPD operation, the skin depth 6 = (pawoo)-' [266,273], where U, is the average value of U , is generally large relative to the discharge dimensions, and E , follows closely the vacuum solution, so that the plasma influences the discharge through the magnetic field H,.…”

Section: Inductively Coupled Dischargesmentioning

confidence: 99%

Low-pressure gas discharge modelling

Lister¹

1992

J. Phys. D: Appl. Phys.

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Low-pressure gas discharge modelling is reviewed, both from a historical perspective and for current industrial applications. An ovetview of the basic mathematical and physical models used to describe low-pressure discharges is given, together with a summary of the most common numerical techniques which have been adopted. Modelling of the oc glow discharge and discharges maintained by high-frequency (RF and microwave) electromagnetic fields is reviewed, with illustrations of the validity of these models in predicting discharge properties and explaining and interpreting experimental results.

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Electromagnetic Field in Electrodeless Discharge

Cited by 19 publications

References 4 publications

High-enthalpy, water-cooled and thin-walled ICP sources characterization and MHD optimization

High-enthalpy, water-cooled and thin-walled ICP sources characterization and MHD optimization

Frequency dependencies of the characteristics of an inductively coupled radiofrequency discharge at reduced pressure

Low-pressure gas discharge modelling

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