NDLI: Emissive Langmuir probes in the strong emission regime for the determination of the plasma properties

Content Provider	IEEE Xplore Digital Library
Author	Tierno, S.P. Domenech, J.L. Donoso, J.M. Conde, L. Jennewein, D. Herdrich, G.
Copyright Year	2012
Description	Author affiliation: Institute für Raumfahrtsysteme (IRS). Universität Stuttgart. Pfaffenwaldring 31, D-70550. Germany (Jennewein, D.; Herdrich, G.) \|\| Dpto. Física Aplicada. ETSI Aeronáuticos. Univerisidad, Politécnica de Madrid. 28040. Spain (Tierno, S.P.; Domenech, J.L.; Donoso, J.M.; Conde, L.)
Abstract	The emissive Langmuir probes are made up of thin metallic wires exposed to the plasma and heated up to the electron thermoionic emission by a DC current $^{1,2,3}.$ They are essentially used to determine the local plasma potential $V^{1,2,3}$ and the electron temperature $T^{4}.$ The weak and strong electron operation emission regimes of the probe are determined by means of the probe temperature T. For probe bias voltages V < V the experimental evidence points out that a fraction of the emitted electron population returns to the probe after colliding. The probe temperature dependent voltage current curves were found in agreement with a simple model, which accounts for this returned electron current. Therefore for low positive probe polarization voltages V two electron populations also coexist close to the probe; the electrons from the plasma and also the local emitted electrons of temperature TW that slightly alter the local potential around the probe. Thus, the electron saturation current results from the sum of two drained electron currents, and one of them relies on the wire temperature. The determination of the plasma potential and the electron temperature for polarization potentials V < V by using the floating potential of the probe is also investigated. The plasma potential was obtained from the measurements of the floating potential as a function of the probe temperature. A sharp transition between two different regimes is observed at the temperature where floating potential equals the plasma potential. However, while on theoretical grounds the determination of the electron temperature T is also possible $^{4},$ the results obtained when using emissive and collecting probes differ. The different electron populations close to the probe when V< V would be responsible of this disparity between the experimental results found with both probes.
File Size	104877
File Format	PDF
ISBN	9781457721274
ISSN	07309244
e-ISBN	9781457721298
e-ISBN	9781457721281
DOI	10.1109/PLASMA.2012.6383291
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-08
Publisher Place	United Kingdom
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Probes Electric potential Plasma temperature Temperature measurement Sociology Statistics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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