Ware pinch effect in Tore Supra

Particle transport in low beta(p) plasmas is investigated. Emphasis is placed on the correlation between central particle density and toroidal electric field. For two types of Tore Supra discharge, with LH current drive or in the PEP mode, the loop voltage profile deduced from an equilibrium reconstruction is used to calculate the velocity of the Ware pinch. A particle transport analysis for the plasma centre shows that a transport model assuming both a Ware pinch velocity and low, but anomalous diffusivity, allows the electron density evolution to be modelled correctly. In the outer part of the plasma, the transport coefficients remain anomalous.