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- W1657702862 abstract "Difficulties in the stabilization of ideal magnetohydrodynamic (MHD) ballooning modes by finite Larmor radius (FLR) effects are considered, in tandem mirror geometry for azimuthal mode numbers l > 1. A kinetic formalism is used to obtain corrections to the long thin approximation, when keeping terms of quadratic order in the curvature. If eta/sub i/ = par. deltalnT/sub i/par. deltalnn/sub i/ greater than or equal to 0, with T/sub i/, n/sub i/, the ion temperature and density, ion resonance effects eliminate absolute FLR stability, though the residual growth rates are substantially reduced from the MHD values. Even lowest order FLR stability is difficult to achieve with choke coils present, but is possible with a more gradually tapered mirror. However, the residual modes are still important, and mixing length estimates of the confinement degradation from modes with l > 1 indicate they can still severely limit the achievement of reactor-grade operation near and above the threshold beta value predicted from the ideal MHD theory. This is most severe if the ion temperature gradient decreases radial (eta/sub i/ > 0), whereupon significant instabilities can even arise below the ideal threshold. However, if the ion temperature gradient can be made positive, and -eta/sub i/more » < 2/3, the lowest order FLR theory suffices to produce stability. 9 refs., 1 fig.« less" @default.
- W1657702862 created "2016-06-24" @default.
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- W1657702862 date "1986-01-01" @default.
- W1657702862 modified "2023-09-27" @default.
- W1657702862 title "Destabilization of MHD modes with finite Larmor radius effects in tandem mirrors" @default.
- W1657702862 hasPublicationYear "1986" @default.
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