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Journal Article

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

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Kühn,  Gerrit
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Kock,  Manfred
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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d6_11_014.pdf
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Citation

Kühn, G., & Kock, M. (2006). A spatially resolved relaxation method for pLTE plasma diagnostics in free-burning arcs. Journal of Physics D, 39(11), 2401-2414. Retrieved from http://www.iop.org/EJ/abstract/0022-3727/39/11/014.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-4C45-2
Abstract
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 ? := Te/Tg with a spatial resolution of 50 µm. We deduced spatially resolved values of ? from the relaxation experiment using independently measured values of Te and ne, so we could determine all free parameters in the partial LTE model.