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A kinetic model of retarding field analyser measurements in strongly magnetized, flowing, collisional plasmas
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SYSNO ASEP 0421661 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title A kinetic model of retarding field analyser measurements in strongly magnetized, flowing, collisional plasmas Author(s) Gunn, J. P. (FR)
Fuchs, Vladimír (UFP-V) RID
Kočan, M. (DE)Source Title Plasma Physics and Controlled Fusion. - : Institute of Physics Publishing - ISSN 0741-3335
Roč. 55, č. 4 (2013), 045012-045012Number of pages 11 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords plasma ; collisions ; magnetic field ; retarding field analyzer Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects 7G10072 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFP-V - RVO:61389021 UT WOS 000317739800012 DOI 10.1088/0741-3335/55/4/045012 Annotation Interpretation of retarding field analyser (RFA) measurements in flowing tokamak scrape- off layer plasmas requires a model of the perturbation introduced by the wake, or presheath, of the instrument. We extend a collisionless kinetic Mach probe theory to include a simple model of ion-ion collisions. Collisions lead to significant modifications in the downstream presheath. Depending on the ion-to-electron temperature ratio, flow speed and collisionality, the measurement obtained by averaging the apparent temperatures on each side of a bi-directional RFA is predicted to overestimate the unperturbed ion temperature, but with errors not exceeding 50% most of the time. The error increases with Mach number, and decreases with the ion-to-electron temperature ratio. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2014
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