On non-zero space average density perturbation effects in tokamak plasma reflectometer signalsReport as inadecuate




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1 LPMIA - Physique des milieux ionisés et applications 2 CEA-DSM-DRFC - Association EURATOM-CEA 3 Association Euratom-CFN-IST 4 LNCFM-CIEMAT 5 LPTP - Laboratoire de Physique et Technologies des Plasmas

Abstract : The effects of the non-zero average density perturbation on phase and amplitude measured by reflectometry are presented. The non-zero average density perturbation on the phase variation can be seen as an index effect as soon as the shape of the density perturbation does not introduce spectral effects. Amplitude modulation in time follows generally the properties of the cut-off layer seen as a mirror but some specific situations produce a time modulation two times higher than the input time variation of the density perturbation as observed in Tore Supra. The introduction of secondary cut-off can exhibit this effect as shown in 2D simulations.

Keywords : reflectometry wave propagation plasma turbulence





Author: Stephane Heuraux - R. Sabot - F. Da Silva - A. Sirinelli - E. Blanco - F. Clairet - P. Hennequin - G. Leclert - L. Vermare -

Source: https://hal.archives-ouvertes.fr/



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