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Title: Laser-induced-fluorescence observation of ion velocity distribution functions in a plasma sheath

Abstract

Experimental results obtained by laser-induced-fluorescence on metastable ion velocity distribution functions (MIVDF) in electrostatic presheaths and sheaths in argon plasmas produced by the thermoionic effect in a multipolar dc discharge are presented. The shape of the measured MIVDF are in qualitative agreement, for the presheath, with Emmert's model and exhibit: (1) a Maxwellian profile at the center of the device where the potential is zero; (2) a distribution function's shape made of three distinct parts at the entrance of the presheath. Inside the sheath the recorded MIVDF recovers a Maxwellian profile with a width unexpectedly related to the background neutral pressure. The velocity and potential profiles that can be deduced from the measured MIVDF show a strong influence of the primary electrons emitted by the filaments.

Authors:
; ; ;  [1]
  1. Equipe Turbulence Plasma, LPIIM, CNRS-Universite de Provence, Marseille (France)
Publication Date:
OSTI Identifier:
20787339
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 13; Journal Issue: 6; Other Information: DOI: 10.1063/1.2206786; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ARGON; DISTRIBUTION FUNCTIONS; ELECTRIC DISCHARGES; ELECTRONS; FLUORESCENCE; IONS; LASERS; PLASMA; PLASMA DIAGNOSTICS; PLASMA POTENTIAL; PLASMA PRESSURE; PLASMA SHEATH; RADIATION TRANSPORT; VELOCITY

Citation Formats

Claire, N, Bachet, G, Stroth, U, Doveil, F, Universitaet Stuttgart Institut fuer Plasmaforschung, Pfaffenwaldring, 31 D-70569 Stuttgart, and Equipe Turbulence Plasma, LPIIM, CNRS-Universite de Provence, Marseille. Laser-induced-fluorescence observation of ion velocity distribution functions in a plasma sheath. United States: N. p., 2006. Web. doi:10.1063/1.2206786.
Claire, N, Bachet, G, Stroth, U, Doveil, F, Universitaet Stuttgart Institut fuer Plasmaforschung, Pfaffenwaldring, 31 D-70569 Stuttgart, & Equipe Turbulence Plasma, LPIIM, CNRS-Universite de Provence, Marseille. Laser-induced-fluorescence observation of ion velocity distribution functions in a plasma sheath. United States. doi:10.1063/1.2206786.
Claire, N, Bachet, G, Stroth, U, Doveil, F, Universitaet Stuttgart Institut fuer Plasmaforschung, Pfaffenwaldring, 31 D-70569 Stuttgart, and Equipe Turbulence Plasma, LPIIM, CNRS-Universite de Provence, Marseille. Thu . "Laser-induced-fluorescence observation of ion velocity distribution functions in a plasma sheath". United States. doi:10.1063/1.2206786.
@article{osti_20787339,
title = {Laser-induced-fluorescence observation of ion velocity distribution functions in a plasma sheath},
author = {Claire, N and Bachet, G and Stroth, U and Doveil, F and Universitaet Stuttgart Institut fuer Plasmaforschung, Pfaffenwaldring, 31 D-70569 Stuttgart and Equipe Turbulence Plasma, LPIIM, CNRS-Universite de Provence, Marseille},
abstractNote = {Experimental results obtained by laser-induced-fluorescence on metastable ion velocity distribution functions (MIVDF) in electrostatic presheaths and sheaths in argon plasmas produced by the thermoionic effect in a multipolar dc discharge are presented. The shape of the measured MIVDF are in qualitative agreement, for the presheath, with Emmert's model and exhibit: (1) a Maxwellian profile at the center of the device where the potential is zero; (2) a distribution function's shape made of three distinct parts at the entrance of the presheath. Inside the sheath the recorded MIVDF recovers a Maxwellian profile with a width unexpectedly related to the background neutral pressure. The velocity and potential profiles that can be deduced from the measured MIVDF show a strong influence of the primary electrons emitted by the filaments.},
doi = {10.1063/1.2206786},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 6,
volume = 13,
place = {United States},
year = {2006},
month = {6}
}