Simulation of reflectometry Bragg backscattering spectral responses in the absence of a cutoff layer

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3499642· OSTI ID:22055829

Silva, F da; Graca, S da ^[1]; Heuraux, S ^[2]; Conway, G D ^[3]

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1. Associacao EURATOM/IST, Instituto de Plasmas e FuSao Nuclear-Laboratorio Associado, Instituto Superior Tecnico, 1046-001 Lisboa (Portugal)
2. Institut Jean Lamour, Unite du CNRS UMR 7198, Universite Henri Poincare, Nancy 1, BP 70239, 54506 Vandoeuvre Cedex (France)
3. Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, D-85748 Garching (Germany)

Experimental reflectometry signals obtained in the absence of a cutoff layer, with the possibility of interferometric operation excluded, show a coherent and recurrent frequency spectrum signature similar to an Alfven cascade signature. A possible explanation resides in the modulation of a resonant Bragg backscattering response by an Alfven mode structure located at the center of the plasma whose frequency of oscillation modulates the backscattered signal in a conformable way. This situation is modeled and simulated using an O-mode full-wave Maxwell finite-difference time-domain code and the resulting signatures are discussed.

• OSTI ID: 22055829
• Journal Information: Review of Scientific Instruments, Vol. 81, Issue 10; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ALFVEN WAVES
BACKSCATTERING
BRAGG REFLECTION
INTERFEROMETRY
MODULATION
OSCILLATIONS
PLASMA
PLASMA WAVES
SIGNALS
SPECTRAL RESPONSE