Vertical stability in a current-carrying stellarator

Journal Article · Sat Apr 01 00:00:00 EST 2000 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.873916· OSTI ID:20215724

Fu, G Y ^[1]

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1. Princeton Plasma Physics Laboratory, Princeton University, P. O. Box 451, Princeton, New Jersey 08543 (United States)

An analytic stability criterion is derived for the vertical mode in a large aspect ratio stellarator with uniform current density profile. The effects of vacuum magnetic field generated by helical coils are shown to be stabilizing due to enhancement of field line bending energy. For a wall at infinite distance from the plasma, the amount of external poloidal flux needed for stabilization is given by f=({kappa}{sup 2}-{kappa})/({kappa}{sup 2}+1), where {kappa} is the axisymmetric elongation and f is the ratio of vacuum rotational transform to the total transform. (c) 2000 American Institute of Physics.

• OSTI ID: 20215724
• Journal Information: Physics of Plasmas, Vol. 7, Issue 4; Other Information: PBD: Apr 2000; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
STELLARATORS
PLASMA INSTABILITY
MAGNETIC FIELDS
CHARGED-PARTICLE TRANSPORT
THEORETICAL DATA