Strong scattering of high power millimeter waves in tokamak plasmas with tearing modes

Journal article (2009)

Authors

E. Westerhof FOM-Institute for Plasma Physics Rijnhuizen

S.K. Nielsen Technical University of Denmark

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JW Oosterbeek Forschungszentrum Jülich

M. Salewski Technical University of Denmark

MR de Baar FOM-Institute for Plasma Physics Rijnhuizen

W.A. Bongers FOM-Institute for Plasma Physics Rijnhuizen

A. Bürger Forschungszentrum Jülich

B.A. Hennen FOM-Institute for Plasma Physics Rijnhuizen

S.B. Korsholm Technical University of Denmark

David Thoen FOM-Institute for Plasma Physics Rijnhuizen

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Published Date

2009

Language

English

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Abstract

In tokamak plasmas with a tearing mode, strong scattering of high power millimeter waves, as used for heating and noninductive current drive, is shown to occur. This new wave scattering phenomenon is shown to be related to the passage of the O point of a magnetic island through the high power heating beam. The density determines the detailed phasing of the scattered radiation relative to the O-point passage. The scattering power depends strongly nonlinearly on the heating beam power.