Necessary criterion for magnetic field reversal in the reversed-field pinch (Articolo in rivista)

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Label
  • Necessary criterion for magnetic field reversal in the reversed-field pinch (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0029-5515/51/6/063016 (literal)
Alternative label
  • D. Bonfiglio; D.F. Escande; P. Zanca; S. Cappello (2011)
    Necessary criterion for magnetic field reversal in the reversed-field pinch
    in Nuclear fusion; International Atomic Energy Agency, Vienna (Austria)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • D. Bonfiglio; D.F. Escande; P. Zanca; S. Cappello (literal)
Pagina inizio
  • 063016 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
  • Article Number: 063016 - La rivista è pubblicata anche online con ISSN 1741-4326. (literal)
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  • http://iopscience.iop.org/0029-5515/51/6/063016/ (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 51 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • Issue: 6; Article Number 063016 (10 pp) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 10 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 6 (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 Consorzio RFX, Corso Stati Uniti 4, 35127 Padova, Italy; - 2 UMR 6633 CNRS-Université de Provence, Faculté de St. Jérôme, case 321, Av. Normandie Niemen, FR-13397 Marseille cedex 20, France. - (D. Bonfiglio1, D.F. Escande2, P. Zanca1 and S. Cappello1) (literal)
Titolo
  • Necessary criterion for magnetic field reversal in the reversed-field pinch (literal)
Abstract
  • We derive analytically a necessary criterion for the reversal of the axial magnetic field of ohmic single-helicity states of the reversed-field pinch. This is done in the frame of resistive magnetohydrodynamics (MHD) in cylindrical geometry using perturbation theory for a paramagnetic pinch with low edge conductivity and axial magnetic field. The criterion involves the radial profile of the logarithmic derivative of the Newcomb eigenfunction of the pinch. It is suggestive that a finite edge radial magnetic field B r(a) might be favourable for field reversal. In accordance with this, visco-resistive MHD simulations show that helical equilibria with smaller maximum radial magnetic fields achieve reversal when a finite B r(a) is applied. Numerical simulations also show that the criterion works for large perturbations of the pinch too, in particular those leading to states with a single helical axis. The necessary criterion is found to be satisfied for reversed states where a finite B r(a) is driven in the RFX-mod machine. (literal)
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