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(EX/P5-02) Perturbative Analysis of Transport and Fluctuation Studies on RFX

S. Martini1), E. Martines1), L. Carraro1), L. Garzotti1), P. Innocente1), R. Lorenzini1), B. Pégourié2), G. Regnoli1), M.E. Puiatti1), M. Spolaore1), D. Terranova1), N. Vianello1), RFX Team1)
1) Consorzio RFX, Associazione EURATOM-ENEA sulla fusione, Padova, Italy
2) CEA Cadarache, DRFC, Saint-Paul-lez-Durance, France

Abstract.  On the RFX reversed field pinch different transport mechanisms govern the centre and the edge of the plasma. Core transport is driven by parallel transport in a stochastic magnetic field, giving rise to an outward directed particle convection velocity. At the edge, roughly corresponding to the region outside the toroidal field reversal surface (where q = 0), electrostatic fluctuations are an important loss channel, but more than 50% of the power losses have been associated to localized plasma-wall interaction due to the non-axisymmetric magnetic perturbations caused by locked modes. In the paper we present the most recent progress made in the modeling and understanding of the above mechanisms underlying particle and energy transport. The paper also discusses the correlations between core and edge transport phenomena. The main tools are perturbative transport studies by pellet injection and the analysis of the contribution of intermittency processes to particle transport in the edge.

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IAEA 2003