Magnetic chaos healing in the helical reversed-field pinch: indications from the volume-preserving field line tracing code NEMATO (Articolo in rivista)

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  • Magnetic chaos healing in the helical reversed-field pinch: indications from the volume-preserving field line tracing code NEMATO (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/1742-6596/260/1/012003 (literal)
Alternative label
  • Bonfiglio D.; Veranda M.; Cappello S.; Chacon L.; Spizzo G. (2010)
    Magnetic chaos healing in the helical reversed-field pinch: indications from the volume-preserving field line tracing code NEMATO
    in Journal of physics. Conference series (Print); IOP PUBLISHING LTD, BRISTOL BS1 6BE (Regno Unito)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Bonfiglio D.; Veranda M.; Cappello S.; Chacon L.; Spizzo G. (literal)
Pagina inizio
  • 012003 (literal)
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  • Article Number 012003. La rivista è pubblicata anche online con ISSN 1742-6596. (literal)
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  • http://iopscience.iop.org/1742-6596/260/1/012003/ (literal)
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  • 260 (literal)
Rivista
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  • Article Number 012003,THEORY OF FUSION PLASMAS: JOINT VARENNA-LAUSANNE INTERNATIONAL WORKSHOP (literal)
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  • 8 (literal)
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  • 1 (literal)
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  • ISI Web of Science (WOS) (literal)
  • Scopu (literal)
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  • Bonfiglio, Veranda, Cappello, Spizzo: Consorzio RFX, Euratom-ENEA Association, Padova, Italy / - Chacon: Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA (literal)
Titolo
  • Magnetic chaos healing in the helical reversed-field pinch: indications from the volume-preserving field line tracing code NEMATO (literal)
Abstract
  • The emergence of a self-organized reversed-field pinch (RFP) helical regime, first shown by 3D MHD numerical simulations, has been highlighted in the RFX-mod experiment at high current operation (IP above 1 MA). In fact, a quasi-stationary helical configuration spontaneously appears, characterized by strong internal electron transport barriers. In such regime electron temperature and density become, to a very good approximation, functions of the helical flux coordinate related to the dominant helical magnetic component. In addition, this regime is diagnosed to be associated with the topological transition to a single-helical-axis (SHAx) state, achieved after the expulsion of the separatrix of the dominant mode's magnetic island. The SHAx state is theoretically predicted to be resilient to the magnetic chaos induced by secondary modes. In this paper, we present initial results of the volume-preserving field line tracing code nemato [Finn J M and Chac´on L 2005 Phys. Plasmas 12 054503] applied to study the magnetic topology resulting from 3D MHD simulations of the RFP. First, a successful 2D verification test of the code is shown, then, initial application to a systematic study of chaos healing in the helical RFP is discussed. The separatrix disappearance is confirmed to play an essential role for chaos healing. The triggering effect of a reversed magnetic shear for the formation of ordered surfaces within magnetic chaos is also diagnosed. (literal)
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