Linear tearing modes calculation for diverted tokamak configurations

Writing the expression of the potential energy in terms of the perturbation of the flux function, and performing an Euler minimization, one obtains a system of ordinary differential equations in that perturbation. For a diverted configuration, the usual vanishing boundary conditions for the perturbe...

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Bibliographic Details
Published in:Physics of plasmas 2004-12, Vol.11 (12), p.5580-5594
Main Authors: Atanasiu, C. V., Günter, S., Lackner, K., Moraru, A., Zakharov, L. E., Subbotin, A. A.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BOUNDARY CONDITIONS
DIFFERENTIAL EQUATIONS
PLASMA
PLASMA CONFINEMENT
TEARING INSTABILITY
TOKAMAK DEVICES
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Summary:Writing the expression of the potential energy in terms of the perturbation of the flux function, and performing an Euler minimization, one obtains a system of ordinary differential equations in that perturbation. For a diverted configuration, the usual vanishing boundary conditions for the perturbed flux function at the magnetic axis and at infinity can no longer be used. An approach to fix “natural” boundary conditions for the perturbed flux function just at the plasma boundary has been developed; this replaces the vanishing boundary conditions at infinity. To obtain the necessary metric coefficients from an equilibrium solver, a function exhibiting the same singularity at the X point has been introduced, and thus the separatrix contour was described by a reduced number of moments.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.1806477