Inter-machine comparison of electromagnetic turbulent structures (Abstract/Poster in atti di convegno)

Type
Label
  • Inter-machine comparison of electromagnetic turbulent structures (Abstract/Poster in atti di convegno) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Alternative label
  • M. Spolaore; N. Vianello; M. Agostini; R. Cavazzana; G. De Masi; E. Martines; B. Momo; A. Scaggion; P. Scarin; S. Spagnolo; G. Spizzo; M. Zuin; I. Furno; F. Avino; A. Fasoli; C. Theiler; J. A. Alonso; C. Hidalgo (2013)
    Inter-machine comparison of electromagnetic turbulent structures
    in FisMat 2013 - Italian National Conference on Condensed Matter Physics, Milano, Italy, 09-13 Sept. 2013
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M. Spolaore; N. Vianello; M. Agostini; R. Cavazzana; G. De Masi; E. Martines; B. Momo; A. Scaggion; P. Scarin; S. Spagnolo; G. Spizzo; M. Zuin; I. Furno; F. Avino; A. Fasoli; C. Theiler; J. A. Alonso; C. Hidalgo (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
  • http://www.fisi.polimi.it/it/fismat2013 Poster id 202 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.fisi.polimi.it/it/fismat2013/submission/view/202 (literal)
Note
  • Abstract (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1-12 : Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, C.so Stati Uniti 4, Padova, Italy / 13-16 : CRPP, EPFL, Association Euratom Suisse, Lausanne, Switzerland / 17-18 : EURATOM-CIEMAT Association, Madrid, Spain. (literal)
Titolo
  • Inter-machine comparison of electromagnetic turbulent structures (literal)
Abstract
  • Filamentary structures elongated in the magnetic field line direction have been detected in magnetized plasmas ranging from laboratory, including thermonuclear fusion devoted experiments, to astrophysical ones. A special attention is paid to the study of turbulent features characterizing edge plasmas of toroidal devices for magnetic plasma confinement, where this represents a hot topic due to the role played by coherent structures in contributing to the transport of particles and energy. Recently an increasing interest has been devoted also to the study of the field-aligned features of these filamentary plasma structures, including both their electrostatic and electromagnetic properties. New information is then provided beyond the standard cross-field characterization, and direct measurement of associated parallel current density, Jpar, and vorticity, ?par, is added. It is worth mentioning that a special relevance for fusion devoted experiments is ascribed to current density associated to ELMs phenomena, observed in the edge of magnetic confinement fusion devices. In this respect a strong experimental effort is in progress in order to provide accurate information on structure features and to gain insight on their dynamics and ultimately on their driving mechanisms. In particular a direct observation of current density filaments associated to the so called \"blobs\" or turbulent structures has been performed in the edge region of the RFX-mod Reversed Field Pinch (RFP) device, where drift kinetic Alfvén structures have been identified. Similar filaments have been observed also in the TORPEX experiment, simple magnetized toroidal plasma, where blobs are originated by ideal interchange waves. In this last case, for the first time the cross-field map of the parallel current density in the filaments has been revealed. Similar investigations were carried out in the edge region of the TJ-II stellarator experiment, where a range of plasma beta can be explored. Aim of this contribution is to present a comparison of electromagnetic properties of turbulent structures, exploiting the complementarity of four different magnetic configurations: the TORPEX device , characterized by open field lines, and the hotter fusion plasmas of the TJ-II stellarator and RFX-mod, which can be operated with both RFP and ohmic tokamak configurations and allows an active control of the edge magnetic topology. Thanks to an original diagnostic concept, direct measurements of both Jpar and ?par were performed inside the filament, in all the explored configurations. The inter-machine comparison revealed a clear dependence of the filament vorticity upon the local time-averaged ExB flow shear. Furthermore, the exercise covered a wide range of local beta showing that this parameter plays a fundamental role in the appearance of filament-like electromagnetic features. (literal)
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