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The turbulence developing in a tokamak�s plasma is liable for a large transport of energy and particles, that slims the plasma magnetic confinement. This turbulence induces electromagnetic fluctuations inside the plasma, which imply local electronic density fluctuations. Using microwave reflectometers 50 - 110 GHz, operating like radars, one can probe the plasma at different depths and then analyse the wave reflected by the plasma.
Probe waves can be polarised ordinarily or extraordinarily, the difference lying dispersion relation of the plasma reflection index. The goal of this work is to compare density fluctuation spectrums, obtained in both polarisations.
Wave number spectrums and radials profiles of corresponding RMS values allow to conclude on a good agreement between the fluctuations density levels generated by measurement done in ordinary or extraordinary polarisation. The comparison of wave number spectrums of density fluctuations underlines the growth of turbulence activity in the gradients zone. These results represent the first steps of an advanced analysis of fluctuation profiles and spectrums generated in ordinary polarisation.

Additional information

Authors: GERBAUD T, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An oral paper given at: Mémoire de stage 2005 Organised by: CEA Caderache, Saint-Paul-lez-Durance (FR) Held at: CEA Caderache, Saint-Paul-lez-Durance (FR)
Availability: Available from Association EURATOM-CEA, Département de Recherches sur la Fusion Contrôlée, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail:
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