Abstract
Measurements are made of the lateral stiffness of a flexible planar superconducting coil between two rigid coils in series. These tests show a dramatic decrease in the natural bending frequency with subsequent elastic instability or ’’buckling’’ at a critical value of the current in the coils. These observations support a magnetoelastic analysis which shows that proposed designs of toroidal field coils for Tokamak fusion reactors have insufficient lateral support for mechanical stability of the magnets.
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