Multi-Dimensional Structure of the Electric Field in Tokamak H-Mode
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- KASUYA Naohiro
- National Institute for Fusion Science
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- ITOH Kimitaka
- National Institute for Fusion Science
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Abstract
In tokamak H-mode, a large poloidal flow exists in an edge transport barrier, and the electrostatic potential and density profiles can be steep both in the radial and poloidal direction. Two-dimensional structures of the potential, density and flow velocity near the edge of a tokamak plasma are investigated. The model includes the nonlinearity in bulk-ion viscosity and turbulence-driven shear viscosity. For the case with a strong radial electric field (H-mode), a two-dimensional structure in a transport barrier is obtained, giving a poloidal shock with a solitary radial electric field profile. The poloidal electric field induces convective transport in the radial direction, and poloidal asymmetry makes the flux-surface-averaged particle flux direct inward with a pinch velocity on the order of 1 [m/s]. A large poloidal flow with radial shear enhances the inward pinch velocity. The abrupt increase of this inward ion and electron flux at the onset of L-to-H-mode transition explains the rapid establishment of the density pedestal at the transition.
Journal
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- Journal of Plasma and Fusion Research
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Journal of Plasma and Fusion Research 81 (7), 553-562, 2005
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
- 1390282681488343424
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- NII Article ID
- 110006281953
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- NII Book ID
- AN10401672
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- COI
- 1:CAS:528:DC%2BD2MXps1Ciur8%3D
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- HANDLE
- 10655/2247
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- NDL BIB ID
- 7434849
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- ISSN
- 09187928
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- Text Lang
- en
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- NDL-Digital
- CiNii Articles
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- Abstract License Flag
- Disallowed