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Study of stability and rotation of a chain of saturated, freely-rotating magnetic islands in tokamaks
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SYSNO ASEP 0543310 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Study of stability and rotation of a chain of saturated, freely-rotating magnetic islands in tokamaks Author(s) Casolari, Andrea (UFP-V)
Ficker, Ondřej (UFP-V) ORCID
Grover, Ondřej (UFP-V) ORCID
Jaulmes, Fabien (UFP-V) ORCID
Kripner, Lukáš (UFP-V) ORCID
Tomešová, Eva (UFP-V) ORCID
Markovič, Tomáš (UFP-V) RID
Peterka, Matěj (UFP-V) RID, ORCID
Yanovskiy, Vadim (UFP-V) ORCIDNumber of authors 9 Article number 074004 Source Title Plasma Physics and Controlled Fusion. - : Institute of Physics Publishing - ISSN 0741-3335
Roč. 63, č. 7 (2021)Number of pages 16 s. Language eng - English Country GB - United Kingdom Keywords instabilities ; magnetic islands ; stability ; rotation ; nonlinear ; theory ; measurements Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects GA18-02482S GA ČR - Czech Science Foundation (CSF) 8D15001 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) 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 000657941000001 DOI 10.1088/1361-6587/abfbbd Annotation The non-linear dynamics of a chain of stationary, saturated magnetic islands is studied by solving a four-field system of equations that include non-ideal effects, lowest order finite Larmor radius corrections and neoclassical terms. The magnetic island rotation velocity is calculated self-consistently with the fields profiles. The solutions for the island rotation velocity and for the ion polarization current are determined as a function of the characteristic parameters of the system and the results are discussed. The results of the calculations show that island rotation velocity and the ion polarization current depend in a non-trivial way on the parameters characterizing the system, and some clear patterns emerge only in particular cases. An analysis of magnetic island rotation velocity is performed on experiments in COMPASS tokamak. Measured island rotation velocity is compared with the calculated ion and electron flow velocities, for different hypotheses on the toroidal rotation of the plasma. The comparison shows that the island rotation velocity is consistent with the ion flow velocity, under the hypothesis of slow toroidal rotation and low collisionality. Theoretical calculation of the island rotation velocity according to the model here developed suggests that the islands rotate weakly in the ion direction, in the hypothesis of slow toroidal rotation and high collisionality. The impossibility of directly measuring the plasma rotation velocity makes it difficult to distinguish between these different regimes. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2022 Electronic address https://iopscience.iop.org/article/10.1088/1361-6587/abfbbd
Number of the records: 1