Articolo in rivista, 2005, ENG, 10.1103/PhysRevLett.94.135001

Self-regulation of ExB flow shear via plasma turbulence

Vianello N.; Spada E.; Antoni V.; Spolaore M.; Serianni G.; Regnoli G.; Cavazzan R.; Bergsåker H.; Drake J.R.

1-5,7 : Assoc EURATOM ENEA Fus, Consorzio RFX, I-35127 Padua, Italy / 8-9 : Alfvèn Laboratory, Royal Institute of Technology, Association EURATOM/VR, SE 100 44 Stockholm, Sweden / 3 : Associazione EURATOM-ENEA sulla fusione, C.R. Frascati, via E. Fermi 45, 00044, Frascati, Italy

The momentum balance has been applied to the ExB flow in the edge region of a reversed field pinch (RFP) configuration. All terms, including those involving fluctuations, have been measured in stationary condition in the edge region of the Extrap-T2R RFP experiment. It is found that the component of the Reynolds stress driven by electrostatic fluctuations is the term playing the major role in driving the shear of the ExB flow to a value marginal for turbulent suppression, so that the results are in favor of a turbulence self-regulating mechanism underlying the momentum balance at the edge. Balancing the sheared flow driving and damping terms, the plasma viscosity is found anomalous and consistent with the diffusivity due to electrostatic turbulence.

Physical review letters (Print) 94 (13), pp. 135001-1–135001-4

Keywords

REVERSED-FIELD PINCH, REYNOLDS STRESS, ELECTROSTATIC TURBULENCE, POLOIDAL FLOW

CNR authors

Antoni Vanni, Serianni Gianluigi, Vianello Nicola, Spolaore Monica

CNR institutes

IGI – Istituto gas ionizzati

ID: 26235

Year: 2005

Type: Articolo in rivista

Creation: 2012-01-03 00:00:00.000

Last update: 2022-09-21 17:06:37.000

External IDs

CNR OAI-PMH: oai:it.cnr:prodotti:26235

DOI: 10.1103/PhysRevLett.94.135001

ISI Web of Science (WOS): 000228289000027

Scopus: 2-s2.0-18144386226