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Plasma rotation in toroidal devices with circular cross-sections

1998; American Institute of Physics; Volume: 5; Issue: 9 Linguagem: Inglês

10.1063/1.873049

1527-2419

V. S. Tsypin, A. B. Mikhaǐlovskiǐ, R. M. O. Galvão, I. C. Nascimento, М. Тендлер, C. A. de Azevedo, A. S. de Assis,

Fusion materials and technologies

The plasma rotation is theoretically investigated in toroidal devices. The dependence of magnetic axis curvature and torsion on the longitudinal coordinate and magnetic field ripples are taken into account. The calculations are carried out within the large aspect ratio and circular magnetic surfaces approximation. General equations for the relaxation of poloidal and toroidal velocities are obtained. The analysis of these equations is completed for the strongly collisional regime (the Pfirsch–Schlüter regime). It is shown that, as a result of the relaxation due to the ion parallel viscosity, there is an equilibrium with the ion toroidal velocity equal to zero. The general expression for the ion poloidal velocity in the Pfirsch–Schlüter regime is obtained. As in the tokamak case, this velocity is proportional to the ion temperature gradient. It does not depend on the plasma density gradient and on the radial electric field. The problems considered in the paper are of interest, specifically for toroidal devices of the “Drakon” (“Dragon”) kind [V. M. Glagolev et al., in Proceedings of the X European Conference on Controlled Fusion and Plasma Physics, USSR, Moscow (European Physical Society, Petit-Lancy, 1981), Vol. 1, p. E8].