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Eikonal waves, caustics and mode conversion in tokamak plasmas
KTH, School of Computer Science and Communication (CSC), Numerical Analysis and Computer Science, NADA.
2007 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 49, no 1, 43-67 p.Article in journal (Refereed) Published
Abstract [en]

Ray optics is used to model the propagation of short electromagnetic plasma waves in toroidal geometry. The new RAYCON code evolves each ray independently in phase space, together with its amplitude, phase and focusing tensor to describe the transport of power along the ray. Particular emphasis is laid on caustics and mode conversion layers, where a linear phenomenon splits a single incoming ray into two. The complete mode conversion algorithm is described and tested for the first time, using the two space dimensions that are relevant in a tokamak. Applications are shown, using a cold plasma model to account for mode conversion at the ion-hybrid resonance in the Joint European Torus.

Place, publisher, year, edition, pages
2007. Vol. 49, no 1, 43-67 p.
Keyword [en]
ion-cyclotron waves, numerical-simulation, toroidal plasmas, global waves
Identifiers
URN: urn:nbn:se:kth:diva-16342DOI: 10.1088/0741-3335/49/1/004ISI: 000243751000004Scopus ID: 2-s2.0-33947634050OAI: oai:DiVA.org:kth-16342DiVA: diva2:334384
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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