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Radial-Poloidal Mapping of the Energy Distribution of Electrons Accelerated by Lower Hybrid Waves in the Scrape-Off Layer
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SYSNO ASEP 0335859 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Radial-Poloidal Mapping of the Energy Distribution of Electrons Accelerated by Lower Hybrid Waves in the Scrape-Off Layer Title Radiálně-poloidální zobrazení distribuce energie elektronů urychlených dolně hybridními vlnami na okraji tokamaku Author(s) Gunn, J. P. (FR)
Petržílka, Václav (UFP-V) RID, ORCID
Fuchs, Vladimír (UFP-V) RID
Ekedahl, A. (FR)
Goniche, M. (FR)
Hillaret, J. (FR)
Kocan, M. (FR)
Saint Laurent, F. (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. 391-394 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, Landau damping transfers the power carried by the high n//>50 component of the lower hybrid (LH) wave to thermal SOL electrons and accelerates them up to a few keV. What amounts to a few percent of the injected LH power is thus transported along field lines and strikes plasma facing components, leading to the formation of well-known "LH hot spots". We report on the first measurements of the energy distribution of the accelerated electrons from 0 to 1 keV using a retarding field analyzer. Two distinct electron populations are present : a cold, thermal population with temperatures between 10 and 30 eV, and a suprathermal component. Only partial attenuation of the electron flux was achieved at maximum applied voltage, indicating energies greater than 1 keV. Detailed 2D mapping of the hot spots was obtained by varying the safety factor stepwise during a single discharge. The radial width of the suprathermal electron beam is rather large, at least about 5-6 cm. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2010
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