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Title: Electromagnetic turbulent structures: A ubiquitous feature of the edge region of toroidal plasma configurations

Electromagnetic features of turbulent filaments, emerging from a turbulent plasma background, have been studied in four different magnetic configurations: the stellarator TJ-II, the Reversed Field Pinch RFX-mod, a device that can be operated also as a ohmic tokamak, and the Simple Magnetized Torus, TORPEX. By applying an analogous diagnostic concept in all cases, direct measurements of both field-aligned current density and vorticity were performed inside the filament. The inter-machine comparison reveals a clear dependence of the filament vorticity upon the local time-averaged E × B flow shear. Furthermore, a wide range of local beta was explored allowing concluding that this parameter plays a fundamental role in the appearance of filament electromagnetic features.
Authors:
; ; ; ; ; ; ; ; ; ; ;  [1] ; ; ; ;  [2] ;  [3] ;  [4] ; ;  [3]
  1. Consorzio RFX (CNR, ENEA, INFN, Università di Padova, Acciaierie Venete SpA), Corso Stati Uniti 4, 35127 Padova (Italy)
  2. Centre de Recherches en Physique des Plasmas (CRPP), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland)
  3. Laboratorio Nacional de Fusion, CIEMAT, Avda. Complutense, 40 28040 Madrid (Spain)
  4. (Germany)
Publication Date:
OSTI Identifier:
22407996
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 1; Other Information: (c) 2015 EURATOM; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANALYTIC FUNCTIONS; CURRENT DENSITY; ELECTRIC FIELDS; FILAMENTS; MAGNETIC FIELDS; PLASMA; REVERSED-FIELD PINCH DEVICES; REVERSE-FIELD PINCH; SHEAR; TOKAMAK DEVICES; TOROIDAL CONFIGURATION; VORTICES