Variations of Current Profiles in Tokamaks Formation Mechanism and Confinement Property of Current-Hole Configuration
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- TAKIZUKA Tomonori
- Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
Bibliographic Information
- Other Title
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- 電流分布の多様性が拓く環状プラズマの新しい世界-平衡・閉じ込め研究への展開-2.トカマクにおける電流分布の多様性 2.2 電流ホール配位の形成機構と閉じ込め特性
- 電流ホール配位の形成機構と閉じ込め特性
- デンリュウ ホールハイイ ノ ケイセイ キコウ ト トジコメ トクセイ
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Description
The formation mechanism of the current hole in tokamak plasmas is reviewed. Experimental results of JT-60U are shown. Increase of the off-central noninductive current is a key factor for the current-hole formation. The internal Transport Barrier (ITB), which generates large bootstrap current, plays an important role. The central current density in the hole stays nearly 0. The idea of a new equilibrium for a tokamak plasma with a current hole is introduced. This equilibrium configuration called ”Axisymmetric Tri-Magnetic-Islands(ATMI) equilibrium”, has three islands along the R direction (a central-negative-current island and side-positive-current islands). The equilibrium is stable with the elongation coils when the current in the ATMI region is limited to a small amount. The confinement properties of a current-hole configuration withbox-type ITB is described. A scaling of the core poloidal beta inside the ITB, βp,core is given as εfβp,core ≈ 1,which suggests the equilibrium limit (εf : inverse aspect ratio at the ITB foot). Though the core stored energy is little dependent on the heating power, the estimated heat diffusivity in the ITB region moderately correlates with a neoclassical diffusivity.
Journal
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- Journal of Plasma and Fusion Research
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Journal of Plasma and Fusion Research 79 (11), 1123-1129, 2003
The Japan Society of Plasma Science and Nuclear Fusion Research
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Keywords
Details 詳細情報について
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- CRID
- 1390282681488777088
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- NII Article ID
- 10012471164
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- NII Book ID
- AN10401672
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- COI
- 1:CAS:528:DC%2BD3sXpvVSgtLc%3D
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- NDL BIB ID
- 6777324
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- ISSN
- 09187928
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed