title: Experimental-like helical self-organization in reversed-field pinch modeling.
abstract: We report the first nonlinear three-dimensional magnetohydrodynamic (MHD) numerical simulations of the reversed-field pinch (RFP) that exhibit a systematic repetition of quasisingle helicity states with the same dominant mode in between reconnection events. This distinctive feature of experimental self-organized helical RFP plasmas is reproduced in MHD simulations at low dissipation by allowing a helical modulation of the plasma magnetic boundary similar to the experimental one. Realistic mode amplitudes and magnetic topology are also found.
authors.affiliation: Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, 35127 Padova, Italy.
authors.forename: D
authors.initials: D
authors.lastname: Bonfiglio
authors.forename: M
authors.initials: M
authors.lastname: Veranda
authors.forename: S
authors.initials: S
authors.lastname: Cappello
authors.forename: D F
authors.initials: DF
authors.lastname: Escande
authors.forename: L
authors.initials: L
authors.lastname: Chacón