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Lower hybrid radiation pattern from ray tracing
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SYSNO ASEP 0335839 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Lower hybrid radiation pattern from ray tracing Title Dolně-hybridní vyzařovací struktura pomocí sledování paprsků Author(s) Cairns, R.A. (GB)
Fuchs, Vladimír (UFP-V) RIDSource Title Contributed Papers 36th European Physical Society Conference on Plasma Physics , 33E. - Sofia : European Physical Society, 2009 / Mateev M. ; Benova E. - ISBN 2-914771-61-4 Pages p1.134 Number of pages 4 s. Publication form CD-ROM - CD-ROM Action European Physical Society Conference on Plasma Physics /36th./ Event date 29.06.2009-03.07.2009 VEvent location Sofia Country BG - Bulgaria Event type WRD Language eng - English Country BG - Bulgaria 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 Lower hybrid current drive is an important feature of many tokamaks. In order to predict the efficiency of the current drive and where it takes place in the tokamak profile, computational techniques which couple calculations of the wave field to Fokker-Planck solutions of the electron distribution function have been developed. Generally the wave field has been calculated using ray tracing techniques, though more recently some full wave calculations have been done. Ray tracing provides a simpler way of proceeding, but the problem arises of dealing with the situation in which there is not a single well developed beam and diffraction and beam divergence are important. Since a lower hybrid antenna produces a complicated spectrum, launching waves in a range of directions, the problem is particularly acute here. In this paper we suggest a way of calculating the wave field from tracing of multiple rays using a technique based on the stationary phase approximation. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2010
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