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  Nonequilibrium phenomena and determination of plasma parameters in the hot core of the cathode region in free-burning arc discharges

Kühn, G., & Kock, M. (2007). Nonequilibrium phenomena and determination of plasma parameters in the hot core of the cathode region in free-burning arc discharges. Physical Review E, 75: 016406. Retrieved from http://link.aps.org/abstract/PRE/v75/e016406.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4942-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4943-B
Genre: Journal Article

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aei2007048.pdf (Publisher version), 2MB
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Kühn, Gerrit1, Author              
Kock, Manfred1, Author              
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1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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 Abstract: We present spectroscopic measurements of plasma parameters (electron density ne, electron temperature Te, gas temperature Tg, underpopulation factor b) in the hot-core region in front of the cathode of a low-current, free-burning arc discharge in argon under atmospheric pressure. The discharge is operated in the hot-core mode, creating a hot cathode region with plasma parameters similar to high-current arcs in spite of the fact that we use comparatively low currents (less than 20 A). We use continuum emission and (optically thin) line emission to determine ne and Te. We apply relaxation measurements based on a power-interruption technique to investigate deviations from local thermodynamic equilibrium (LTE). These measurements let us determine the gas temperature Tg. All measurements are performed side-on with charge-coupled-device cameras as detectors, so that all measured plasma parameters are spatially resolved after an Abel inversion. This yields the first ever spatially resolved observation of the non-LTE phenomena of the hot core in the near-cathode region of free-burning arcs. The results only partly coincide with previously published predictions and measurements in the literature.

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 Dates: 2007
 Publication Status: Published in print
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Title: Physical Review E
Source Genre: Journal
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Pages: - Volume / Issue: 75 Sequence Number: 016406 Start / End Page: - Identifier: -