Non-LTE diagnostic of an argon arc plasma

Nick, K.‐P.; Richter, Jan; Helbig, V.

doi:10.1016/0022-4073(84)90002-5

Cited by 74 publications

(44 citation statements)

References 15 publications

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“…Similar values (roughly between 1 and 2) are presented in [22] for the bulk plasma of a cascaded arc. However, the bulk plasma shows a behaviour, upon parameter variation, which is completely different from what we saw in the cathode region in our experiment.…”

Section: Electron Density Electron Temperature and Temperature Ratiosupporting

confidence: 57%

“…During the following years it is used to examine the plasma of different arc discharges [33][34][35]. Among other applications, the method is later employed on cascaded arcs [20,22,[36][37][38], ICPs [39][40][41][42] and transferred arcs [43].…”

Section: Relaxation Methodsmentioning

confidence: 99%

“…However, the bulk plasma shows a behaviour, upon parameter variation, which is completely different from what we saw in the cathode region in our experiment. In [22] a rising current leads to a rising electron density and rising electron temperatures, and thus β reaches unity as the bulk plasma approaches LTE along with the higher collision rates. In contrast, figure 11 shows that β indicates stronger deviations from LTE when approaching the cathode, even though n e and T e are higher in this region.…”

Section: Electron Density Electron Temperature and Temperature Ratiomentioning

confidence: 99%

“…[19][20][21][22]). The assumption of a single b-factor describing the deviation of all excited levels from LTE is based on the aforementioned large energy gap between the ground state and the excited states in noble gases.…”

Section: Plte Modelmentioning

confidence: 99%

See 3 more Smart Citations

A spatially resolved relaxation method for pLTE plasma diagnostics in free-burning arcs

Kühn

Kock

2006

J. Phys. D: Appl. Phys.

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We report on a relaxation method to determine the electron-to-gas temperature ratio in the near-cathode region of a low-current free-burning arc operated in argon under atmospheric pressure. We used an intensified CCD camera to record the relaxation process after a fast power-interruption of the discharge with a time resolution better than 1 µs. For the CCD images we applied an ABEL inversion procedure yielding 3D information about the temperature ratio β := T e /T g with a spatial resolution of 50 µm. We deduced spatially resolved values of β from the relaxation experiment using independently measured values of T e and n e , so we could determine all free parameters in the partial LTE model.

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Section: Electron Density Electron Temperature and Temperature Ratiosupporting

confidence: 57%

Section: Relaxation Methodsmentioning

confidence: 99%

Section: Electron Density Electron Temperature and Temperature Ratiomentioning

confidence: 99%

Section: Plte Modelmentioning

confidence: 99%

See 2 more Smart Citations

A spatially resolved relaxation method for pLTE plasma diagnostics in free-burning arcs

Kühn

Kock

2006

J. Phys. D: Appl. Phys.

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“…Experiments with "extinguishing" arcs, where line intensity courses have been studied, confirm this outcome. From measurements of initial enhancement and subsequent decay of line intensities, the gas temperature before turning off the electric field supply, can easily be deduced (see for example [19,20]). …”

Section: Introductionmentioning

confidence: 99%

Diagnostics of Helium-Argon Arc Discharge Plasma Based on Spectral Line Shape Measurements

Wujec

Μusielok

1999

Acta Phys. Pol. A

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Electron densities and ion (gas) temperatures on the axis of an arc discharge plasma, produced at atmospheric pressure in a gas mixture of 95% helium and 5% argon, are determined at two arc currents. The evaluation of both main plasma parameters is based on line shape measurements, the ion temperature on the Doppler broadening of selected ArII lines, while the electron density on the Stark broadening of the hydrogen Hp line which appear in the spectrum due to hydrogen traces in the applied gases. The significance of reliable plasma diagnostics for determination of atomic structure data is discussed.PACS numbers: 32.30.-r, 32.70.-n, 52.25.-b

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Recombination of a Xenon Plasma Jet

Anders

1987

Contrib Plasma Phys

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As pointed out in a previous paper, stable spherical plasma configurations can be produced by pulsed injection of a plasma into an ambient gas. It is shown here that the observed long plasma lifetime of severs1 milliseconds is in agreement with collisional-radiative recombination theories.We used the modified diffusion approximation by BIBERMAN et al. involving thermal non-equilibrium, recombination heating of electrons, heat conduction, radiation and other details. Under the assumption of a pure xenon plasma, the calculated plasma lifetime is even longer than the observed one. This discrepancy can be explained by the presence of molecules and turbulent mixing with the outer gas, which are not considered in the recombination calculation.

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Non-LTE diagnostic of an argon arc plasma

Cited by 74 publications

References 15 publications

A spatially resolved relaxation method for pLTE plasma diagnostics in free-burning arcs

A spatially resolved relaxation method for pLTE plasma diagnostics in free-burning arcs

Diagnostics of Helium-Argon Arc Discharge Plasma Based on Spectral Line Shape Measurements

Recombination of a Xenon Plasma Jet

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