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Spatially resolved characterization of electrostatic fluctuations in the scrape-off layer of the CASTOR tokamak (Articolo in rivista)

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Spatially resolved characterization of electrostatic fluctuations in the scrape-off layer of the CASTOR tokamak (Articolo in rivista) (literal)

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P. Devynck; G. Bonhomme; E. Martines; J. Stockel; G. Van Oost; I. Voitsekhovitch; J. Adamek; A. Azeroual; F. Doveil; I. Duran; E. Gravier; J. Gunn; M. Hron (2005)
Spatially resolved characterization of electrostatic fluctuations in the scrape-off layer of the CASTOR tokamak
in Plasma physics and controlled fusion (Print); IOP Publishing Ltd. (Institute of Physics Publishing Ltd), "Bristol ; London" (Regno Unito)
(literal)

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P. Devynck; G. Bonhomme; E. Martines; J. Stockel; G. Van Oost; I. Voitsekhovitch; J. Adamek; A. Azeroual; F. Doveil; I. Duran; E. Gravier; J. Gunn; M. Hron (literal)

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Association EURATOM-CEA, CEA/DSM/DRFC centre de Cadarache, 13108 Saint Paul Lez Durance, France / Université Henri Poincaré, Vandoeuvre les Nancy, France / Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione, Padova, Italy / Institute of Plasma Physics, Association EURATOM-IPP.CR, Prague, Czech Republic / Department of Applied Physics, Ghent University, Belgium / Equipe Turbulence Plasma, Laboratoire PIIM, Université de Provence, Marseille, France (literal)

Titolo

Spatially resolved characterization of electrostatic fluctuations in the scrape-off layer of the CASTOR tokamak (literal)

Abstract

The poloidal distribution of turbulence in the scrape-off layer (SOL) of the CASTOR tokamak is studied by means of a ring of 32 electric probes covering the whole perimeter of the poloidal cross section. Analysis of floating potential fluctuations in a SOL created in the top part of the machine by shifting the plasma downwards reveals a dominant periodic structure that propagates poloidally in the direction of the E-r x B drift. Its poloidal mode number is found to be equal to the local safety factor q. Correlation and pulse propagation analyses show that this high m mode is a signature of a single long flute-like structure that is aligned with the magnetic field and snakes around the torus several times before terminating on the limiter. (literal)

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