Effect of quadrupole fields on local three-dimensional (3-D) ideal magnetohydrodynamic (MHD) stability in torsatrons
- 1 March 1994
- journal article
- letter
- Published by AIP Publishing in Physics of Plasmas
- Vol. 1 (3) , 793-795
- https://doi.org/10.1063/1.870773
Abstract
The local three‐dimensional (3‐D) ideal magnetohydrodynamic (MHD) stability properties of a 12‐field period torsatron device of moderate aspect ratio are investigated as a function of an externally applied quadrupole magnetic field. It is demonstrated that with a parabolic pressure profile the volume‐averaged β limit due to the ballooning instabilities decreases from β≂2% to β≂1.5% as the current Imid in the quadrupole field coils normalized to that in the main helical coils increases from 0 to 0.19.Keywords
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