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APS » Journals » Phys. Rev. Lett. » Volume 103 » Issue 12
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Phys. Rev. Lett. 103, 125001 (2009) [4 pages]

Strong Scattering of High Power Millimeter Waves in Tokamak Plasmas with Tearing Modes

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E. Westerhof1, S. K. Nielsen2, J. W. Oosterbeek3, M. Salewski2, M. R. De Baar1, W. A. Bongers1, A. Bürger3, B. A. Hennen1, S. B. Korsholm2, F. Leipold2, D. Moseev2, M. Stejner2, D. J. Thoen1, and the TEXTOR Team
1FOM-Institute for Plasma Physics Rijnhuizen, Association EURATOM-FOM Trilateral Euregio Cluster, Nieuwegein, The Netherlands
2Association EURATOM-Risø DTU, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DK-4000 Roskilde, Denmark
3Institute for Energy Research–Plasma Physics, Forschungszentrum Jülich GmbH, Association EURATOM-FZJ, Trilateral Euregio Cluster, 52425 Jülich, Germany

Received 14 April 2009; published 14 September 2009

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.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.125001
DOI:
10.1103/PhysRevLett.103.125001
PACS:
52.25.Os, 52.50.Sw, 52.55.Fa, 52.55.Tn

*http://www.rijnhuizen.nl

 
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