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Vortex-induced diffusivity in reversed field pinch plasmas
KTH, Superseded Departments, Alfvén Laboratory.
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2004 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 93, no 21Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
2004. Vol. 93, no 21
Keyword [en]
electrostatic turbulence, coherent structures, edge turbulence, velocity shear, transport, tokamak, intermittency, dynamics, vortices, flows
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-23885DOI: 10.1103/PhysRevLett.93.215003ISI: 000225220500039ScopusID: 2-s2.0-37649031803OAI: diva2:342584
QC 20100525 QC 20110916Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2011-09-16Bibliographically approved

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Bergsåker, HenricDrake, James R.
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