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Boundary plasma physics in RFX-mod: Radial electric field and transport topology (Articolo in rivista)

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Boundary plasma physics in RFX-mod: Radial electric field and transport topology (Articolo in rivista) (literal)

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P. Scarin; M. Agostini; L. Carraro; A. Scaggion; G. Spizzo; M. Spolaore; N. Vianello (2013)
Boundary plasma physics in RFX-mod: Radial electric field and transport topology
in Journal of nuclear materials; North Holland Pub. Co., Amsterdam (Paesi Bassi); ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, AMSTERDAM (Paesi Bassi)
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P. Scarin; M. Agostini; L. Carraro; A. Scaggion; G. Spizzo; M. Spolaore; N. Vianello (literal)

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Proc. 20th Int. Conf. on Plasma-Surface Interactions in Controlled Fusion Devices (PSI-20), Aachen (Germany) 20-25 May 2012. La rivista è pubblicata anche online con ISSN 1873-4820. (literal)

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Consorzio RFX, Associazione EURATOM-ENEA sulla fusione, C.so Stati Uniti 4, Padova, Italy (literal)

Titolo

Boundary plasma physics in RFX-mod: Radial electric field and transport topology (literal)

Abstract

The high current regimes of the RFX- mod (R = 2m, a = 0.46 m) reversed field pinch experiment are characterized by the presence of a dominant m/n = 1/-7 kink-type mode that moulds the plasma in a 3D topology. This paper describes the strong influence of such global helical state on the scrape- off layer, which becomes helically modulated itself. In particular, the link between the edge magnetic topology and the temporal variation of locally measured quantities (like particle influx, electron density and temperature, toroidal flow and floating potential) is analyzed for different plasma density. The edge radial electric field Er exhibits a periodicity similar to the dominant m/n = 1/-7 mode, being more negative in correspondence to the outward magnetic shift. Indications are obtained about the ambipolar nature of the edge radial electric field. This suggests a link with the mechanism of density limit in the RFP, where Er is determined by different electron mobility modulated by m/n = 0/1 islands. (literal)

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