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  • Title: Observations of improved stability and confinement in a high-beta self-organized spherical-torus-like field-reversed configuration.
    Author: Guo HY, Hoffman AL, Steinhauer LC, Miller KE.
    Journal: Phys Rev Lett; 2005 Oct 21; 95(17):175001. PubMed ID: 16383833.
    Abstract:
    An extremely high-beta (over 85%) self-organized field-reversed configuration (FRC) with a spherical-torus- (ST-)like core is produced in the translation, confinement, and sustainment experiment by highly super-Alfvénic translation of a spheromaklike plasmoid. Substantial flux conversion from toroidal into poloidal occurs during the capture process, resulting in the ST-like core. This plasma state exhibits a remarkable stabilizing property for the ubiquitous centrifugally driven interchange modes present in theta-pinch formed FRCs. This is explained, for the first time, by a simple model taking into account magnetic shear and centrifugal effects. The FRC-ST configuration has up to 4 times improvement in flux confinement times over the scaling of conventional theta-pinch formed FRCs and, thus, a significant improvement in the resistivity and transport.
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