Bifurcation to 3D helical magnetic equilibrium in an axisymmetric toroidal device

W.F. Bergerson, F. Auriemma, B.E. Chapman, W.X. Ding, P. Zanca, D.L. Brower, P. Innocente, L. Lin, R. Lorenzini, E. Martines, B. Momo, J.S. Sarff, D. Terranova

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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. © 2011 American Physical Society.
Original languageEnglish
Article number255001
Pages (from-to)-
JournalPhysical Review Letters
Volume107
Issue number25
DOIs
Publication statusPublished - 13 Dec 2011
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Bergerson, W. F., Auriemma, F., Chapman, B. E., Ding, W. X., Zanca, P., Brower, D. L., ... Terranova, D. (2011). Bifurcation to 3D helical magnetic equilibrium in an axisymmetric toroidal device. Physical Review Letters, 107(25), -. [255001]. https://doi.org/10.1103/PhysRevLett.107.255001