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Author Comer, Kate ♦ Callen, James D.
Source CiteSeerX
Content type Text
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Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Abstract We have introduced a new perturbative technique with the goal of rapidly exploring the dependence of long wavelength ideal magnetohydrodynamic (MHD) instabilities on equilibrium proles, shaping properties, and wall parameters. Traditionally, these relations are studied with numerical parameter scans using computationally intensive stability codes. Our perturbative technique rst nds the equilibrium and stability us-ing traditional methods. Subsequent small changes in the original equilibrium proles, shaping properties, and wall parameters result in a new stability for the perturbed con-ditions. We quickly nd the new stability with an expansion of the energy principle, rather than with another complete run of the stability codes. We rst apply the technique to semi-analytic screw pinch equilibria. The screw pinch results validate the approach, but also indicate that equilibria with certain fea-tures allow only very small perturbations. Next, we extend the approach to toroidal geometry using experimental equilib-ria and a simple constructed equilibrium, with the ideal MHD stability code GATO. Stability properties are successfully predicted from perturbed toroidal equilibria when
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Publisher Date 2004-01-01