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- Hellsten, Torbjörn, et al.
(author)
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Continuous Double Adiabatic Spectrum in Toroidal Plasmas
- 1984
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In: Physica Scripta. - 0031-8949 .- 1402-4896. ; 30, s. 78-
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Journal article (peer-reviewed)abstract
- The continuous spectrum of an anisotropic and axisymmetric toroidal plasma is investigated using the double adiabatic theory. The continuum is given by an eigenvalue problem of a fourth order system of ordinary differential equations. In contrast to the magnetohydrodynamic continuum the double adiabatic continuum may become unstable. The stability depends upon the parallel and perpendicular pressure distributions along the field lines. In absence of a toroidal magnetic field, the fourth order system decouples into two second order differential equations for which specific stability criteria are derived.
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- Scheffel, Jan, 1954-
(author)
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Linear MHD Equilibria in Toroidal Geometry - Exact and Approximate Solution
- 1984
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In: Physica Scripta. - 0031-8949 .- 1402-4896. ; 30, s. 216-
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Journal article (peer-reviewed)abstract
- The linear Grad-Shafranov equation for a toroidal, axisymmetric plasma is solved analytically. Exact solutions are given in terms of confluent hyper-geometric functions. As an alternative, simple and accurate WKBJ solutions are presented. With parabolic pressure profiles, both hollow and peaked toroidal current density profiles are obtained. As an example the equilibrium of a z-pinch with a square-shaped cross section is derived.
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