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Application of the triple-probe technique to magnetized plasmas
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SYSNO ASEP 0566725 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Application of the triple-probe technique to magnetized plasmas Author(s) Dimitrova, Miglena (UFP-V) ORCID
Popov, Tsv.K. (BG)
Dejarnac, Renaud (UFP-V) RID, ORCID
Kovačič, J. (SI)
Ivanova, P. (BG)
Gyergyek, T. (SI)
Losada, U. (ES)
Hidalgo, C. (ES)
Pánek, Radomír (UFP-V) RID
Stöckel, Jan (UFP-V) RIDNumber of authors 10 Article number 015009 Source Title Plasma Physics and Controlled Fusion. - : Institute of Physics Publishing - ISSN 0741-3335
Roč. 65, č. 1 (2023)Number of pages 10 s. Language eng - English Country GB - United Kingdom Keywords plasma diagnostics-probes ; triple-probe technique ; electron temperature Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects LM2018117 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF16_019/0000768 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000894064500001 EID SCOPUS 85144278381 DOI 10.1088/1361-6587/aca5b1 Annotation The triple-probe technique (TPT) is a diagnostic widely used to determine the electron temperature in various devices and plasma conditions. It was developed for measurements in low-pressure gas-discharge plasmas in the absence of a magnetic field. This paper presents a comparison of the experimental results obtained by swept Langmuir probe (LP) measurements with those obtained by the TPT in magnetized plasmas in three experimental machines with different magnetic field magnitudes (0.01-1.15 T). The reliability of the triple-probe results for the electron temperature in tokamak plasmas at higher magnetic fields is discussed. It was found that the larger the magnetic field, the more the TPT overestimates the electron temperature compared with single swept LPs. The explanation proposed in this paper is based on a shift in the floating potential towards the plasma potential in the presence of a magnetic field, yielding a more positive voltage measured by the TPT and therefore higher electron temperatures. Using the extended formula for the electron probe current in the presence of a magnetic field a correction factor is derived such that the TPT yields a temperature similar to that of the swept LP techniques. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2023 Electronic address https://iopscience.iop.org/article/10.1088/1361-6587/aca5b1
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