Origin and turbulence spreading of plasma blobs

P. Manz; T. T. Ribeiro; B. D. Scott; G. Birkenmeier; D. Carralero; G. Fuchert; S. H. Müller; H. W. Müller; U. Stroth; E. Wolfrum

doi:10.1063/1.4908272

Origin and turbulence spreading of plasma blobs

P. Manz, T. T. Ribeiro, B. D. Scott, G. Birkenmeier, D. Carralero, G. Fuchert, S. H. Müller, H. W. Müller, U. Stroth, E. Wolfrum

Chair of Plasmarand- und Divertorphysik

Research output: Contribution to journal › Article › peer-review

53 Scopus citations

Abstract

The formation of plasma blobs is studied by analyzing their trajectories in a gyrofluid simulation in the vicinity of the separatrix. Most blobs arise at the maximum radial electric field outside the separatrix. In general, blob generation is not bound to one particular radial position or instability. A simple model of turbulence spreading for the scrape-off layer is derived. The simulations show that the blob dynamics can be represented by turbulence spreading, which constitutes a substantial energy drive for far scrape-off layer turbulence and is a more suitable quantity to study blob generation compared to the skewness.

Original language	English
Article number	022308
Journal	Physics of Plasmas
Volume	22
Issue number	2
DOIs	https://doi.org/10.1063/1.4908272
State	Published - 1 Feb 2015

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10.1063/1.4908272

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title = "Origin and turbulence spreading of plasma blobs",

abstract = "The formation of plasma blobs is studied by analyzing their trajectories in a gyrofluid simulation in the vicinity of the separatrix. Most blobs arise at the maximum radial electric field outside the separatrix. In general, blob generation is not bound to one particular radial position or instability. A simple model of turbulence spreading for the scrape-off layer is derived. The simulations show that the blob dynamics can be represented by turbulence spreading, which constitutes a substantial energy drive for far scrape-off layer turbulence and is a more suitable quantity to study blob generation compared to the skewness.",

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AU - Manz, P.

AU - Ribeiro, T. T.

AU - Scott, B. D.

AU - Birkenmeier, G.

AU - Carralero, D.

AU - Fuchert, G.

AU - Müller, S. H.

AU - Müller, H. W.

AU - Stroth, U.

AU - Wolfrum, E.

PY - 2015/2/1

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N2 - The formation of plasma blobs is studied by analyzing their trajectories in a gyrofluid simulation in the vicinity of the separatrix. Most blobs arise at the maximum radial electric field outside the separatrix. In general, blob generation is not bound to one particular radial position or instability. A simple model of turbulence spreading for the scrape-off layer is derived. The simulations show that the blob dynamics can be represented by turbulence spreading, which constitutes a substantial energy drive for far scrape-off layer turbulence and is a more suitable quantity to study blob generation compared to the skewness.

AB - The formation of plasma blobs is studied by analyzing their trajectories in a gyrofluid simulation in the vicinity of the separatrix. Most blobs arise at the maximum radial electric field outside the separatrix. In general, blob generation is not bound to one particular radial position or instability. A simple model of turbulence spreading for the scrape-off layer is derived. The simulations show that the blob dynamics can be represented by turbulence spreading, which constitutes a substantial energy drive for far scrape-off layer turbulence and is a more suitable quantity to study blob generation compared to the skewness.

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VL - 22

JO - Physics of Plasmas

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ER -

Origin and turbulence spreading of plasma blobs

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