title: Tokamak magnetohydrodynamic equilibrium states with axisymmetric boundary and a 3D helical core.
abstract: Magnetohydrodynamic (MHD) equilibrium states with imposed axisymmetric boundary are computed in which a spontaneous bifurcation develops to produce an internal three-dimensional (3D) configuration with a helical structure in addition to the standard axisymmetric system. Equilibrium states with similar MHD energy levels are shown to develop very different geometric structures. The helical equilibrium states resemble saturated internal kink mode structures.
authors.affiliation: Ecole Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas,Association Euratom-Confédération Suisse, CH-1015 Lausanne, Switzerland. wilfred.cooper@epfl.ch
authors.forename: W A
authors.initials: WA
authors.lastname: Cooper
authors.forename: J P
authors.initials: JP
authors.lastname: Graves
authors.forename: A
authors.initials: A
authors.lastname: Pochelon
authors.forename: O
authors.initials: O
authors.lastname: Sauter
authors.forename: L
authors.initials: L
authors.lastname: Villard