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On attenuation of electron current of flush-mounted probes and electrodes in magnetised plasmas
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SYSNO ASEP 0509559 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title On attenuation of electron current of flush-mounted probes and electrodes in magnetised plasmas Author(s) Komm, Michael (UFP-V) RID, ORCID
Cavalier, Jordan (UFP-V) RID, ORCID
Podolník, Aleš (UFP-V) ORCID
Stöckel, Jan (UFP-V) RID
Adámek, Jiří (UFP-V) RID, ORCID
Dejarnac, Renaud (UFP-V) RID, ORCIDNumber of authors 6 Article number 096050 Source Title Nuclear Fusion. - : Institute of Physics Publishing - ISSN 0029-5515
Roč. 59, č. 9 (2019)Number of pages 7 s. Language eng - English Country AT - Austria Keywords 2-dimensional particle simulation ; scrape-off layer ; langmuir probe ; divertor ; surface ; bias ; tokamak ; divertor ; Langmuir probe ; pfc ; particle-in-cell ; electrode biasing Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects GA16-14228S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000480385900002 EID SCOPUS 85072101177 DOI 10.1088/1741-4326/ab2d7b Annotation The ratio of electron and ion saturation currents measured by probes embedded in the plasma-facing components (PFCs) in magnetised plasmas is typically lower than predicted by Langmuir theory. In the past, several works targeted various effects influencing the ion saturation current, which can be larger than expected, especially if the magnetic field is at a grazing angle with respect to the probe surface. In this contribution, we focus on the electron current, which can be reduced when the magnetic field line intercepting the probe passes through the magnetic pre-sheath of the nearby PFC. In such a case an effective potential well forms and repels a fraction of the electrons incoming from the plasma. Experimental results obtained by a tiltable limiter at the DITE tokamak are revisited and reproduced by means of 2D3V particle-in-cell simulations. The reduction of the electron current is indeed observed both in simulations and in experiment. This mechanism may also explain why some divertor biasing experiments did not produce E x B flows in the divertor region. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2020 Electronic address https://iopscience.iop.org/article/10.1088/1741-4326/ab2d7b
Number of the records: 1