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Abstract

Analytic solutions of the magnetohydrodynamic equilibrium equations for a symmetric magnetically confined plasma with sheared incompressible flows associated with electric fields similar to those observed in the transition from the low- to the high-confinement mode in tokamaks are constructed in cylindrical and toroidal geometries. In particular, an exact toroidal solution is obtained which for vanishing flows reduces to the Solovev equilibrium which has been extensively employed in tokamak confinement studies. Owing to the flow, several toroidal configurations having either one or two stagnation points are possible in addition to the usual ones with a single magnetic axis. For flows pertaining to tokamak operational regime the extremum of the electric field becomes larger as flow and its shear increase, the location of the extremum being, however, nearly independent of these variations. In addition, the flow affects the safety factor profile and the shape of the magnetic surfaces and results in an increase of the magnetic shear and a decrease of the toroidal beta. The impact of plasma elongation on the above-mentioned confinement figures of merit is also evaluated.

Additional information

Authors: SIMINTZIS C, University of Ioannina, Association Euratom-Hellenic Republic, Section of Theoretical Physics (GR);THROUMOULOPOULOS G.N, University of Ioannina, Association Euratom-Hellenic Republic, Section of Theoretical Physics (GR);PANTIS G, University of Ioannina, Association Euratom-Hellenic Republic, Section of Theoretical Physics (GR);TASSO H, Max-Planck-Institut fur Plasmaphysik, Euratom Association, Garching (DE)
Bibliographic Reference: An article published in: Physics of Plasma, Vol. 8, no.6, pp.2641-2648
Record Number: 200013629 / Last updated on: 2001-09-17
Category: PUBLICATION
Original language: en
Available languages: en
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