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Current density limitation during disruptions due to plasma-sheaths
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SYSNO ASEP 0558998 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Current density limitation during disruptions due to plasma-sheaths Author(s) Adámek, Jiří (UFP-V) RID, ORCID
Artola, F. J. (FR)
Loarte, A. (FR)
Matveeva, Ekaterina (UFP-V)
Cavalier, Jordan (UFP-V) RID, ORCID
Pitts, R.A. (FR)
Roccella, R. (FR)
Lehnen, M. (FR)
Havlíček, Josef (UFP-V) RID, ORCID
Hron, Martin (UFP-V) RID, ORCID
Pánek, Radomír (UFP-V) RIDNumber of authors 11 Article number 086034 Source Title Nuclear Fusion. - : Institute of Physics Publishing - ISSN 0029-5515
Roč. 62, č. 8 (2022)Number of pages 6 s. Language eng - English Country AT - Austria Keywords disruption ; tokamak ; compass ; halo current ; Langmuir probe Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects GA20-28161S GA ČR - Czech Science Foundation (CSF) EF16_019/0000768 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UFP-V - RVO:61389021 UT WOS 000816877400001 EID SCOPUS 85134174198 DOI 10.1088/1741-4326/ac7656 Annotation The presented experimental study realized in the COMPASS tokamak demonstrates, for the first time, that the current density that flows from the plasma into the vacuum vessel during disruptions is limited by the ion particle flux. Such a limitation shows that, at least in COMPASS, the sheath that forms between the plasma and the first wall dominates the halo current flow. This observation is achieved by measuring simultaneously the ion saturation current with negatively biased Langmuir probes and the halo current with grounded probes to the vacuum vessel. These comparative measurements, which were never performed during disruptions in other machines, directly confirm that the halo current density remains below the ion particle flux in COMPASS. The study also shows, using Mirnov coils measurement, that the total electric current entering the wall grows with the plasma current while the current density obtained by Langmuir probes remains unaffected. This, together with the current density limitation, leads to a novel finding that the halo current width increases with the pre-disruptive plasma current, which limits the local forces. The new findings reported here could also provide potential constraints on the modeling of disruption-induced loads on future reactor scale tokamaks and motivation for further experiments on existing devices. 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/10.1088/1741-4326/ac7656
Number of the records: 1