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Author(s):
H.J. Gardner and K. Ichiguchi
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Title:
Free-Boundary Equilibrium Studies for the Large Helical Device
Date of publication:
June 1993
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Key words:
Large Helical Device, free boundary, VMEC, magnetic diagnostics, diamagnetic flux, plasma control
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Abstract:
A free-boundary version of the VMEC three-dimenslonal equilibrium code, together with a code, DIAGNO, to determine the response to a set of magnetic diagnostic coils has been applied to the Large Helical Device. Two sequences of equilibria were considered: one where an external vertical field was used to keep the plasma centered and another where the outwardly shifting plasma, was truncated by a limiter. The predictions of a simple cylindrical model have been verified for a diamagnetic loop. A set of simple response curves has been obtained which should be useful for the analysis and control of the finite < beta >plasma. The ideal Mercier criterion suggests that the centered plasma might be rnore stable.
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