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

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 heatin...

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Bibliographic Details
Published in:Physical review letters 2009-09, Vol.103 (12), p.125001-125001, Article 125001
Main Authors: Westerhof, E, Nielsen, S K, Oosterbeek, J W, Salewski, M, De Baar, M R, Bongers, W A, Bürger, A, Hennen, B A, Korsholm, S B, Leipold, F, Moseev, D, Stejner, M, Thoen, D J
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CLOSED PLASMA DEVICES
HEATING
INSTABILITY
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC ISLANDS
PLASMA
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
SCATTERING
TEARING INSTABILITY
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.103.125001