Flux of Parallel Flow Momentum by Parallel Shear Flow Driven Instability
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- KOSUGA Yusuke
- Institute for Advanced Study, Kyushu University Research Institute for Applied Mechanics, Kyushu University
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- ITOH Sanae-I.
- Research Institute for Applied Mechanics, Kyushu University Research Center for Plasma Turbulence, Kyushu University
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- ITOH Kimitaka
- Research Center for Plasma Turbulence, Kyushu University National Institute for Fusion Science
Abstract
<p></p><p>The flux of parallel momentum by parallel shear flow driven instability is calculated with the self-consistent mode dispersion. The result indicates that the diffusive component has two characteristic terms: νD1 ∼ ṽx2 /γ(0) and νD2 ∼ ṽx2 /(k∥2D∥) where ṽx is the fluctuation radial velocity, γ(0) is the growth rate of the mode, k∥ is the parallel wave number, and D∥ is the electron diffusivity along the magnetic field. νD1 results when the parallel flow shear is above the threshold, while νD2 is important around the marginal state. Since typically νD1 ≫ νD2 ∼ Dn, where Dn is the particle diffusivity, the Prandtl number (≡ ν/Dn) becomes large when parallel flow shear driven instability occurs. This feature may explain the experimental observation on the difference between profiles of density and toroidal flow in edge and SOL plasmas.</p><p></p>
Journal
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- Plasma and Fusion Research
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Plasma and Fusion Research 11 (0), 1203018-1203018, 2016
The Japan Society of Plasma Science and Nuclear Fusion Research
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Details 詳細情報について
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- CRID
- 1390001205253844096
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- NII Article ID
- 130005311669
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- ISSN
- 18806821
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed