Bifurcation to 3D helical magnetic equilibrium in an axisymmetric toroidal device |
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| Authors: | Bergerson W F Auriemma F Chapman B E Ding W X Zanca P Brower D L Innocente P Lin L Lorenzini R Martines E Momo B Sarff J S Terranova D |
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| Institution: | Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA. |
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| Abstract: | We report the first direct measurement of the internal magnetic field structure associated with a 3D helical equilibrium generated spontaneously in the core of an axisymmetric toroidal plasma containment device. Magnetohydrodynamic equilibrium bifurcation occurs in a reversed-field pinch when the innermost resonant magnetic perturbation grows to a large amplitude, reaching up to 8% of the mean field strength. Magnetic topology evolution is determined by measuring the Faraday effect, revealing that, as the perturbation grows, toroidal symmetry is broken and a helical equilibrium is established. |
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