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On the possiblity of direct electrical power extraction from scrape-off layer currents in tokamaks
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SYSNO ASEP 0509569 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title On the possiblity of direct electrical power extraction from scrape-off layer currents in tokamaks Author(s) Komm, Michael (UFP-V) RID, ORCID
Stöckel, Jan (UFP-V) RID
Adámek, Jiří (UFP-V) RID, ORCID
Kremers, B. (NL)
Vondráček, Petr (UFP-V) RID, ORCID
Bílková, Petra (UFP-V) RID
Böhm, Petr (UFP-V) RID
Šos, Miroslav (UFP-V) ORCID
Pánek, Radomír (UFP-V) RIDNumber of authors 9 Article number 095017 Source Title Plasma Physics and Controlled Fusion. - : Institute of Physics Publishing - ISSN 0741-3335
Roč. 61, č. 9 (2019)Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords divertor ; non-ambipolarity ; nuclear fusion ; scrape-off layer currents ; thermoelectric currents ; Tokamak 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) LM2015045 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000481694800007 EID SCOPUS 85072105573 DOI 10.1088/1361-6587/ab2739 Annotation Currents flowing in the scrape-off layer (SOL) are routinely observed in a number of tokamaks. They are usually closed through the divertor plates, either between the inner and outer target or between different poloidal sections of each target. The most common driving mechanisms of SOL currents are the thermoelectric effect (due to electron temperature difference between the two targets) and Pfirsch-Schlüter flows caused by radial pressure gradient. The SOL currents are commonly used for diagnostic purposes-e.g. as ELM monitors or for real-time estimation the divertor electron temperature. In this paper, we report on attempts to extract the SOL currents and related electrical power from the tokamak COMPASS using a dedicated insulated divertor tile and electronics setup, which allows for fast switching between grounded and floating state. It is observed that plasma acts as an ideal power source and that the magnitude of SOL currents scales with upstream separatrix temperature T e,sep. 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/10.1088/1361-6587/ab2739
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