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Abstract

Three methods to study the effect of density fluctuations on the reflected signal, based on a 2D full-wave analysis and Born approximation numerical and analytical calculations, are developed. The explicit analytical expression for the signal produced by an island-like perturbation running in poloidal direction is obtained and shown to be in nice agreement with results of numerical techniques for small level density perturbations. It is shown, both numerically and analytically, that due to small-angle scattering effects, fluctuations far from the cut-off layer may produce a significant and, in some realistic cases, dominant response. The conditions under which the fluctuation reflectometry signal is generated only in the cut-off vicinity are given.

Additional information

Authors: GUSAKOV E Z, Ioffe Physico-Technical Institute, St Petersburg (RU);YAKOVLEV B O, Ioffe Physico-Technical Institute, St Petersburg (RU);LECLERT G, LPIIM, CNRS-Université de Provence, Marseille (FR);BOUCHER I, LPMI, UHP Nancy I, Vandoeuvre (FR);HEURAUX S, LPMI, UHP Nancy I, Vandoeuvre (FR);HACQUIN S, LPMI, UHP Nancy I, Vandoeuvre (FR);COLLIN M, LPMI, UHP Nancy I, Vandoeuvre (FR);BULANIN V V, State Technical University, St Petersburg (RU);PETROV A V, State Technical University, St Petersburg (RU);CLAIRET F, CEA-DRFC, CEA Cadarache, St Paul-lez-Durance (FR);ZOU X L, CEA-DRFC, CEA Cadarache, St Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion, 44 (August 2002) 1565-1579
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://stacks.iop.org/0741-3335/44/1565
Record Number: 200215622 / Last updated on: 2002-12-02
Category: PUBLICATION
Original language: en
Available languages: en
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