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Title: Effect of fast drifting electrons on electron temperature measurement with a triple Langmuir probe

Triple Langmuir Probe (TLP) is a widely used diagnostics for instantaneous measurement of electron temperature and density in low temperature laboratory plasmas as well as in edge region of fusion plasma devices. Presence of a moderately energetic flowing electron component, constituting only a small fraction of the bulk electrons, is also a generally observed scenario in plasma devices, where plasmas are produced by electron impact ionization of neutrals. A theoretical analysis of its effect on interpretation of the TLP data for bulk electron temperature measurement is presented here assuming electron velocity distribution is not deviating substantially from a Maxwellian. The study predicts conventional expression from standard TLP theory to give overestimated value of bulk electron temperature. Correction factor is significant and largely depends on population density, temperature, and energy of the fast component. Experimental verification of theoretical results is obtained in the magnetized plasma linear experimental device of Saha Institute of Nuclear Physics where plasma is produced by an electron cyclotron resonance method and known to have a fast flowing electron component.
Authors:
; ;  [1] ;  [2]
  1. Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064 (India)
  2. Integrated Science Education and Research Centre, Visva-Bharati University, Santiniketan 731235, West Bengal (India)
Publication Date:
OSTI Identifier:
22494720
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DENSITY; ELECTRON CYCLOTRON-RESONANCE; ELECTRON DENSITY; ELECTRON DRIFT; ELECTRON TEMPERATURE; ELECTRONS; EXPERIMENT RESULTS; IONIZATION; LANGMUIR PROBE; MAGNETIZATION; TEMPERATURE RANGE 0065-0273 K; THEORETICAL DATA; VERIFICATION