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A large variety of plasma conditions has been created in TCV (Tokamak 11 Configuration Variable, B(T) < 1.5 T, R(O) = 0.88 m, alpha < 0.25 m). They include limited and diverted discharges with elongations in the range 1-2.58, triangularities between -0.7 and I as well as ôsquareö shapes with plasma currents in the range 0.1-1 MA. Over the entire range of quasi-stationary ohmic conditions investigated we observe a correlation between electron pressure profiles and conductivity profiles, suggesting that {p} / p(0) {j} / j (0), where (} refers to an average over the volume or respectively, the cross sectional area of the plasma. The profiles become broader as the average current density is increased. These ôprofile consistencyö features are in apparent agreement with theoretical considerations based on minimum energy states of the plasma or on stationary entropy. Further analysis of the experimental evidence, together with a model of the current profile consistent with neoclassical conductivity in the confinement zone and corresponding to a safety factor 0.8 ú q = 1 inside the sawtoothing core, however, shows that the observations can be accounted for by the effects of sawtooth activity.

Additional information

Authors: WIESEN ET AL, Centre de Recherches en Physique des Plasmas, EURATOM Association-Confederation Suisse, Ecole Polytechnique Federale de Lausanne (CH)
Bibliographic Reference: An article published in: Plasma Physics Control Fusion 40 (1998) pp.1803-1818
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