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Landau damping of the lower hybrid grill spectrum by tokamak edge electrons
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SYSNO ASEP 0335852 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Landau damping of the lower hybrid grill spectrum by tokamak edge electrons Author(s) Fuchs, Vladimír (UFP-V) RID
Gunn, J. P. (FR)
Petržílka, Václav (UFP-V) RID, ORCID
Horáček, Jan (UFP-V) RID, ORCID
Seidl, Jakub (UFP-V) RID
Ekedahl, A. (FR)
Goniche, M. (FR)
Hillairet, J. (FR)Source Title RADIO FREQUENCY POWER IN PLASMAS: Proceedings of the 18th Topical Conference. AIP Conference Proceedings, 1187. - Melville : American Institute of Physics, 2009 / Bobkov V. ; Noterdaeme J.-M. - ISBN 978-0-7354-0753-4 Pages s. 383-386 Number of pages 4 s. Action Topical Conference on Radio Frequency Power in Plasmas/18th./ Event date 24.06.2009-26.06.2009 VEvent location Ghent Country BE - Belgium Event type WRD Language eng - English Country US - United States Keywords Lower hybrid wave ; tokamak ; plasma Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects GA202/07/0044 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20430508 - UFP-V (2005-2011) Annotation According to theory and simulations Landau damping accelerates resonant electrons in front of a lower hybrid (LH) grill and generates substantial powerflows of order 1-10 MW/m2 along magnetic field lines. It is therefore of interest to understand the radial extent of this powerflow. Previous analyses predict interaction regions of order mm, whereas recent retarding field analyzer measurements detect energetic electron flows up to a few cm away from the grill mouth. It is shown here that the observed wide interaction region can be explained by electron Landau damping of the grill spectrum in the range 5<n//<200 by a mix of the thermal background with the generated fast electrons. Simulations show that in a typical Tore Supra tokamak plasma edge background with 25 MW/m2 of radiated antenna power density, the fast electrons exiting the grill region constitute about 7% of the electron population and are near-Maxwellian with a temperature of about 950 eV. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2010
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