Volume 56, Number 4, November 2001
|Page(s)||542 - 548|
|Section||Physics of gases, plasmas, and electric discharges|
|Published online||01 December 2003|
Evidence for the role of magnetic entropy and turbulent equipartition in stationary Ohmic tokamak discharges
Centre de Recherches en Physiques des Plasmas
Association EURATOM-Confédération Suisse
Ecole Polytechnique Fédérale de
Lausanne CH-1015 Lausanne, Switzerland
2 Istituto di Fisica del Plasma "P. Caldirola" Associazione EURATOM-ENEA-CNR Via Cozzi 53, 20125 Milano, Italy
Accepted: 29 August 2001
The electron temperature, pressure and density profiles from an extreme variety of shaped Ohmically heated sawtoothing plasmas in TCV (Tokamak à Configuration Variable, , , a< 0.25 ) are compared to model predictions drawing from two bodies of theory. One of these is based on the assumption of stationary magnetic entropy and predicts stiff toroidal current, and consequently Ohmically relaxed electron temperature profiles. The second theory is based on the assumption of approximate conservation of the first and second adiabatic invariants during particle transport and predicts density profiles closely related to the safety factor. The robustness of these predictions in Ohmically heated plasmas is confirmed by systematic observations in TCV.
PACS: 52.55.Fa – Tokamaks, spherical tokamaks / 52.55.Dy – General theory and basic studies of plasma lifetime, particle and heat loss, energy balance, field structure, etc / 52.25.Kn – Thermodynamics of plasmas
© EDP Sciences, 2001
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