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Vortex-induced diffusivity in reversed field pinch plasmas
KTH, Tidigare Institutioner, Alfvénlaboratoriet.
Vise andre og tillknytning
2004 (engelsk)Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 93, nr 21Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Coherent structures identified in two reversed field pinch experiments are interpreted as a dynamic balance of dipolar and monopolar vortices growing and evolving under the effect of the ExB flow shear. For the first time their contribution to the anomalous transport has been estimated in fusion related plasmas, showing that they can account for up to 50% of the total plasma diffusivity. The experimental findings indicate that the diffusion coefficient associated with the coherent structures depends on the relative population of the two types of vortices and is minimum when the two populations are equal. An interpretative model is proposed to explain this feature.

sted, utgiver, år, opplag, sider
2004. Vol. 93, nr 21
Emneord [en]
electrostatic turbulence, coherent structures, edge turbulence, velocity shear, transport, tokamak, intermittency, dynamics, vortices, flows
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-23885DOI: 10.1103/PhysRevLett.93.215003ISI: 000225220500039Scopus ID: 2-s2.0-37649031803OAI: oai:DiVA.org:kth-23885DiVA, id: diva2:342584
Merknad
QC 20100525 QC 20110916Tilgjengelig fra: 2010-08-10 Laget: 2010-08-10 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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