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

Journal Article · Thu Jan 15 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4906869· OSTI ID:22407996

Vianello, N.; Agostini, M.; Cavazzana, R.; De Masi, G.; Martines, E.; Momo, B.; Scaggion, A.; Scarin, P.; Spagnolo, S.; Spizzo, G.; Zuin, M. ^[1]; Furno, I.; Avino, F.; Fasoli, A.; Theiler, C. ^[2]; Carralero, D. ^[3]; Alonso, J. A.; Hidalgo, C. ^[3]

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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)

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.

• OSTI ID: 22407996
• Journal Information: Physics of Plasmas, Vol. 22, Issue 1; Other Information: (c) 2015 EURATOM; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

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