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Title: How plasma parameters fluctuations influence emissive probe measurements

Relationship between the floating potential of an emissive probe and plasma potential oscillations is studied in the case of controlled oscillations of plasma parameters. This relationship is compared to a quasi-static model for floating potential oscillations that assumes a constant emission current and includes the fluctuations of plasma parameters (density and electron temperature). Two different plasma regimes are considered. In the first one, the model is coherent with experimental results. In the second, the model does not fulfill one of the assumption due to the evidence of emission current oscillations when the mean emission current exceeds a given threshold. This second regime highlights the importance of taking into account emission current oscillations in the interpretation of emissive probe measurements. Nevertheless, discrepancies are still observed between emissive probe floating potential and plasma potential oscillations.
Authors:
;  [1] ; ;  [2] ;  [3]
  1. Laboratoire de Physique, École Normale Supérieure de Lyon, CNRS and Université de Lyon, 46 allée d'Italie, 69364 Lyon Cedex 07 (France)
  2. Institut Jean Lamour IJL, Université de Lorraine, UMR 7198 CNRS, Vandoeuvre-les-Nancy (France)
  3. Institute of Plasma Physics ASCR v. v. i., Prague (Czech Republic)
Publication Date:
OSTI Identifier:
22410355
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTRON TEMPERATURE; EMISSION; FLUCTUATIONS; OSCILLATIONS; PLASMA DENSITY; PLASMA POTENTIAL; PROBES