ISSN:
0392-6737
Keywords:
MHD equilibria
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Summary A previous investigation by one of us, concerning the self-consistent equilibria of a two-region (plasma+gas) cylindrical Tokamak, is extended to the similar equilibria of a Reversed-Field Pinch, where a significant current density is driven by a dynamo electric field due to turbulence. The previous model has been generalized under the following basic assumptions:a) to the lowest order, the turbulent dynamo electric fieldE t is expressed as a homogeneous function of degree 1 of the magnetic fieldB, sayE t =α·B, with α being a 2nd-rank tensor, homogeneous of degree 0 inB, and generally depending on the plasma state;b)E t does not appear in the plasma power balance, as if it were produced by a Maxwell demon able to extract the needed power from the plasma internal energy. In particular we show that, in the simplest case when both α and the plasma resistivity η are isotropic and constant, the magnetic field turns out force-free with constant abnormality αμ0/η for vanishing axial electric fieldE z . This case has also been solved analytically, for whateverE z , under circular, besides cylindrical, symmetry.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02453784
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