Thermal conduction energy loss in an argon afterglow

Sørensen, Torben Smith; Sexton, M. C.

doi:10.1088/0022-3727/3/11/319

Cited by 4 publications

(1 citation statement)

References 4 publications

(2 reference statements)

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“…The double layer evolved from an anode sheath, as has been observed in similar devices in a homogeneous magnetic field (Torven and Anderson 1979, Torven and Lindberg 1980, Anderson 1981, Fujita et a1 1984. It has not been possible to interpret the transition from an anode sheath to a double layer as a sequence of steady states (Anderson and Sorensen 1983), but fluctuations are important as has been shown by numerical simulations (Cooke and Katz 1985). Ionisation within the anode sheath is the dominant process in the transition, in spite of the fact that the typical ionisation mean free path for an electron is several metres and the anode sheath thickness less than 1 cm (Torven and Anderson 1979).…”

Section: Introductionmentioning

confidence: 99%

Current limitation and formation of plasma double layers in a non-uniform magnetic field

Plamondon

Teichmann

Torvén

1988

J. Phys. D: Appl. Phys.

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Formation of strong double layers has been observed experimentally in a magnetised plasma column maintained by a plasma source. The magnetic field is approximately axially homogeneous except in a region at the anode where the electric current flows into a converging magnetic field. For field strengths larger than about 200 G the double layer has a stationary position only in the region of non-uniform magnetic field or at the aperture separating the source and the plasma column. It is characterised by a negative differential resistance in the current-voltage characteristic of the device. The parameter space, where the double layer exists, has been studied as well as the corresponding potential profiles and fluctuation spectra. The electric current and the axial electric field are oppositely directed between the plasma source and a potential minimum which is formed in the region of inhomogeneous magnetic field. Electron reflection by the resulting potential barrier is found to explain the essential features of the current-voltage characteristics observed, but further investigations of waves and fluctuations are required to clarify the current transport.

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Section: Introductionmentioning

confidence: 99%

Current limitation and formation of plasma double layers in a non-uniform magnetic field

Plamondon

Teichmann

Torvén

1988

J. Phys. D: Appl. Phys.

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Elementary Reactions and the Interpretation of Measurements of Chemically Reacting Non L.T.E. Plasmas

DRAWIN¹

1976

Plasma Chemistry–2: Plasma Chemistry and Transport Phenomena in Thermal Plasmas

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Abstract-The "thermodynamic state" and the spatial-temporal evolution of the composition of chemically reacting plasmas are generally described by the Boltzmann or Pauli kinetic equations (balance equations for the transfer of particle densities, momentum, and energy for the different chemical species). Due to the numerous difficulties encountered when solving these coupled differential equations, simplifying assumptions are often introduced. The resultstherefore depend,ontheonehand,ontheelementaryreactions chosenforthemodelcalculations and,ontheother hand, on the cross-sections. Vice versa, the interpretation of both the thermodynamic state and the diagnostic measurements is dependent on the kind of elementary reactions introduced in the model.The dependence on the different atomic and molecular elementary reactions of the atomic (molecular) models adopted is demonstrated for some cases such as hydrogen, helium, highly ionized atoms, nitrogen, on the basis of a Maxwellian velocity distribution. As a refined step, deviations from a Maxwellian distribution should be taken into account. The laser is often used for plasma diagnostic purposes. The influence of the plasma state by a superimposed laser radiation field is briefly treated including photo-ionization and recombination stimulated by one and two laserphotons. Omission of these reactions can lead to erroneous interpretation of measurements. Some of the model calculations are compared with experimental results.

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Observations of electron temperature relaxation rates in rare gas afterglow plasmas

Dean¹,

Smith²,

Adams³

1974

J. Phys. B: At. Mol. Phys.

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Thermal conduction energy loss in an argon afterglow

Cited by 4 publications

References 4 publications

Current limitation and formation of plasma double layers in a non-uniform magnetic field

Current limitation and formation of plasma double layers in a non-uniform magnetic field

Elementary Reactions and the Interpretation of Measurements of Chemically Reacting Non L.T.E. Plasmas

Observations of electron temperature relaxation rates in rare gas afterglow plasmas

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