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Electron-cyclotron wave scattering by edge density fluctuations in ITER

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Tsironis, Christos, Peeters, A. G., Isliker, Heinz, Strintzi, Dafni, Chatziantonaki, Ioanna and Vlahos, Loukas (2009) Electron-cyclotron wave scattering by edge density fluctuations in ITER. Physics of Plasmas, Vol.16 (No.11). Article no. 112510. doi:10.1063/1.3264105

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Official URL: http://dx.doi.org/10.1063/1.3264105

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Abstract

The effect of edge turbulence on the electron-cyclotron wave propagation in ITER is investigated with emphasis on wave scattering, beam broadening, and its influence on localized heating and current drive. A wave used for electron-cyclotron current drive (ECCD) must cross the edge of the plasma, where density fluctuations can be large enough to bring on wave scattering. The scattering angle due to the density fluctuations is small, but the beam propagates over a distance of several meters tip to the resonance layer and even small angle scattering leads to a deviation of several centimeters at the deposition location. Since the localization of ECCD is crucial for the control of neoclassical tearing modes, this issue is of great importance to the ITER design. The wave scattering process is described oil the basis of a Fokker-Planck equation, where the diffusion coefficient is calculated analytically as well as computed numerically using a ray tracing code. (C) 2009 American Institute of Physics. [doi:10.1063/1.3264105]

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Journal or Publication Title: Physics of Plasmas
Publisher: American Institute of Physics
ISSN: 1070-664X
Official Date: November 2009
Dates:
DateEvent
November 2009Published
Volume: Vol.16
Number: No.11
Number of Pages: 4
Page Range: Article no. 112510
DOI: 10.1063/1.3264105
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: European Fusion Programme (Association EURATOM-Hellenic Republic), Hellenic General Secretariat of Research and Technology

Data sourced from Thomson Reuters' Web of Knowledge

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