Coherent structures and anomalous transport in reversed field pinch plasmas

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...

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Published inPhysica scripta Vol. 2006; pp. 1 - 7
Main Authors Antoni, V, Drake, J R, Spada, E, Spolaore, M, Vianello, N, Bergsåker, H, Cavazzana, R, Cecconello, M, Martines, E, Serianni, G
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.01.2006
Subjects
confinement
diii-d
edge turbulence
electrostatic turbulence
fluctuations
intermittency
magnetized plasma
reynolds stress
tokamak
velocity shear-layer
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Summary: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.
ISSN:1402-4896
0031-8949
1402-4896
DOI:10.1088/0031-8949/2006/T122/002