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Coherent structures and anomalous transport in reversed field pinch plasmas
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics. KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics.
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2006 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. T122, 1-7 p.Article in journal (Refereed) Published
Abstract [en]

The results leading to the identification of coherent structures emerging from the background turbulence in the edge region of the reversed field pinch experiments EXTRAP-T2R and RFX are reviewed. These structures have traits of vortices in velocity field and blobs in density, and the reconstruction of their spatial structure and of their time evolution is discussed focusing on the analysis tools applied. The role of these structures in the particle anomalous transport is addressed, showing that their collisions can contribute up to 50% the total particle losses. This process is shown to be responsible for bursts in particle flux and it is found to set a characteristic collision time, which is in agreement with the statistical properties of laminar times for particle flux bursts.

Place, publisher, year, edition, pages
2006. Vol. T122, 1-7 p.
Keyword [en]
velocity shear-layer, electrostatic turbulence, edge turbulence, magnetized plasma, reynolds stress, diii-d, tokamak, intermittency, fluctuations, confinement
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-15614DOI: 10.1088/0031-8949/2006/T122/002ISI: 000236918100002ScopusID: 2-s2.0-36348988562OAI: diva2:333656
QC 20100525 QC 20111003. Conference: 3rd Nordic Symposium on Plasma Physics. Lysebu, NORWAY. OCT 04-07, 2004Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-10-03Bibliographically approved

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Drake, James R.Bergsåker, HenricCecconello, Marco
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