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Relativistic Fermi-Ulam map: Application to WEGA stellarator lower hybrid power operation
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SYSNO ASEP 0430250 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Relativistic Fermi-Ulam map: Application to WEGA stellarator lower hybrid power operation Author(s) Fuchs, Vladimír (UFP-V) RID
Laqua, H.P. (DE)
Seidl, Jakub (UFP-V) RID
Krlín, Ladislav (UFP-V) RID
Pánek, Radomír (UFP-V) RID
Preinhaelter, Josef (UFP-V) RID
Urban, Jakub (UFP-V) RIDSource Title Physics of Plasmas - ISSN 1070-664X
Roč. 21, č. 6 (2014), 061513-061513Number of pages 10 s. Publication form Print - P Action Twentieth Topical Conference on Radio Frequency Power in Plasmas Event date 25.06.2013-28.06.2013 VEvent location Sorrento Country IT - Italy Event type WRD Language eng - English Country US - United States Keywords plasma ; tokamak Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects LM2011021 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GP13-38121P GA ČR - Czech Science Foundation (CSF) GAP205/11/2341 GA ČR - Czech Science Foundation (CSF) GAP205/10/2055 GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 UT WOS 000338995300019 EID SCOPUS 84903591923 DOI 10.1063/1.4884346 Annotation Analytical and numerical support is here provided in support of the explanation for the observation of MeV electrons during Lower Hybrid (LH) operation in EC pre-heated plasma at the WEGA stellarator. LH power at 2.45 GHz is radiated into a B 0.5 T plasma at Te 10 eV with an EC-generated 50 keV population of electrons. In response, fast electrons travel around flux or drift surfaces essentially without collisions, repeatedly interacting with the rf field and gaining energy in the process. We derive here a relativistic generalization of the simplified area-preserving Fermi-Ulam (F-U) map allowing phase-space global stochasticity analysis. At WEGA conditions, and with correlated phases between electron–antenna electric field interaction events, the F-U map and supporting numerical simulations predict an absolute energy barrier around 300 keV. In contrast, with random phases, the electron energy can reach MeV values, compatible with the measurements on WEGA. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2015
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