Electron-temperature and electron-density profiles in an atmospheric-pressure argon plasma jet

Snyder, S. C.; Reynolds, L. D.; Fincke, J.R.; Lassahn, G.D.; Grandy, J.D.; Repetti, T. E.

doi:10.1103/physreve.50.519

Cited by 37 publications

(23 citation statements)

References 19 publications

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“…with the presence of a large variety in temperatures, as is for instance shown in the paper of Snyder et al [4]. A typical example of a small plasma with a large temperature variation is a plasma produced by the Torcheà Injection Axiale (TIA).…”

Section: Introductionmentioning

confidence: 93%

Steep plasma gradients studied with spatially resolved Thomson scattering measurements

Jonkers

Selen

Mullen

et al. 1997

Plasma Sources Sci. Technol.

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Abstract. Plasmas created by the microwave torch Torcheà Injection Axiale (TIA), which are around 2 mm in diameter and 15 mm long, are investigated. In these plasmas large gradients are present so that the edge is supposed to play an important role. Using global Thomson scattering measurements, in which global refers to the fact that the size of the laser beam is approximately equal to the diameter of the plasma, the electron densities and temperatures were determined. However, these results lead to discrepancies in the particle balance: the production of free electrons is much larger than the classical losses due to recombination, convection and diffusion. Radially resolved Thomson scattering measurements show the plasma has a hollow structure. Although this enhances the losses due to diffusion, still a large discrepancy remains between production and destruction of free electrons in the argon plasmas. Probably some molecular processes are significant as well. A good candidate is the charge transfer between argon ions and nitrogen molecules, since mixing with the surrounding air has a large impact on the plasma.

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Section: Introductionmentioning

confidence: 93%

Steep plasma gradients studied with spatially resolved Thomson scattering measurements

Jonkers

Selen

Mullen

et al. 1997

Plasma Sources Sci. Technol.

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“…The best agreement is obtained with the experimental results of Nick et al [17], Snyder et al [18], de Regt et al [19] and Reiche et al [20], which are between the calculated curves of the electron number density. The results of Lim and Houk [21], Huang et al [22], Snyder et al [23], Zhu et al [24] and Snyder et al [25] are below the curve for T e /T h = 1 due to the interactions of the plasma with its surrounding, which decrease the measured electron number density by up to four orders of magnitude. This decrease is caused by the recombination of electrons on the container walls, gas flow and ambipolar diffusion, which are not considered in the Saha equation.…”

Section: Resultsmentioning

confidence: 78%

“…These phenomena significantly affect the electron number densities for small plasma diameters at electron temperatures above 9,000 K. For electron temperatures from 4,000 to 9,000 K, the measured values of Goode et al [26], Snyder et al [18], Huang et al [27,28], and Aguilera and Aragon [29] are up to one order of magnitude higher al. [28], × Lim and Houk [21], + Snyder et al [18], t Snyder et al [23], 3 de Regt et al [19], --this work at Te/T h = 1 and 10.…”

Section: Resultsmentioning

confidence: 95%

Non-LTE Argon-plasma Composition

Piotrowski

2005

Czech J Phys

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In this paper theory of calculation of non-LTE plasma composition is presented. The calculations are conducted for argon plasma for temperature ranges from 500 K to 30,000 K and Te/T h ratios from 1 to 10. The effect of different versions of the Saha equation, Debye length, lowering of ionisation energy and pressure correction on the argon-plasma composition is evaluated. It was concluded that the modified Saha equation could not be used for calculation of non-LTE plasma composition. Application of various Debye lengths can change the electron number density by 8%. The lowering of the ionisation energy decreases the electron number density by 18%. For LTE-plasma pressure correction has a negligible effect on the electron number density.PACS : 51.30.+i

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“…Several new approaches have been proposed based on different formalisms [27,28] A significant effort has been spent on developing laser-based diagnostics which offer the promise of not only having high spatial and temporal resolution, but also of being independent of the assumption of local thermodynamic equilibrium. Thomson and Rayleigh scattering as well as CARS have been used for characterization of arcs and turbulent plasma jets [30][31][32], and results have given some information on chemical and thermal nonequilibrium. However, the assumptions made for the data reduction may pose comparable restrictions to the validity of the data as the assumption of LTE.…”

Section: New Approaches In Thermal Plasma Modeling and Diagnosticsmentioning

confidence: 99%

New approaches in thermal plasma technology

Heberlein

2002

Pure and Applied Chemistry

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Thermal plasmas offer unique advantages for materials processing, such as high fluxes of heat and of reactant species. Recent developments have concentrated on improving control of these fluxes across the boundaries surrounding the thermal plasma. Secondary discharges (hybrid plasma generators) and pulse modulation of the plasma have been some of the approaches for this end. The use of such methods is described for selected applications. Plasma characterization through advanced models and diagnostics are concentrating on description of plasma instabilities and various nonequilibrium conditions. Understanding of these effects will allow their use for enhanced processing methods.

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Electron-temperature and electron-density profiles in an atmospheric-pressure argon plasma jet

Cited by 37 publications

References 19 publications

Steep plasma gradients studied with spatially resolved Thomson scattering measurements

Steep plasma gradients studied with spatially resolved Thomson scattering measurements

Non-LTE Argon-plasma Composition

New approaches in thermal plasma technology

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