Development of Computational Technique for Labeling Magnetic Flux-Surfaces
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概要
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In recent Large Helical Device (LHD) experiments, radial profiles of ion temperature, electric field, etc. have been measured in the m/n = 1/1 magnetic island produced by island control coils, where m is the poloidal mode number and n the toroidal mode number. When the plasma transport in radial profiles is numerically analyzed, an average over a magnetic flux-surface in the island is a very useful concept to understand the transport. When averaging, a proper labeling of the flux-surfaces is necessary. In general, it is not easy to label the flux-surfaces in a magnetic field containing the island, compared with the case of a magnetic field configuration having nested flux-surfaces. In the present paper, we have developed a new computational technique to label the magnetic flux-surfaces. This technique uses an optimization algorithm called the simulated annealing method. The flux-surfaces are discerned by using two labels: one is classification of the magnetic field structure, i.e., core, island, ergodic, and outside regions, and the other depends on the value of the toroidal magnetic flux. We have applied this technique to an LHD configuration with the m/n = 1/1 island, and successfully discriminated of the magnetic field structure.
- 社団法人 プラズマ・核融合学会の論文
著者
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Hayashi Takaya
National Institute For Fusion Science
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KANNO Ryutaro
National Institute for Fusion Science
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SATAKE Shinsuke
National Institute for Fusion Science, Toki 509-5292 Japan
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TAKAMARU Hisanori
Department of Computer Science, Chubu University
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NUNAMI Masanori
National Institute for Fusion Science
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SATAKE Shinsuke
National Institute for Fusion Science
関連論文
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- Possibility of LHD Equilibrium with Zero Rotational Transform Surface
- Magnetic reconnection and relaxation phenomena in Spherical Tokamak
- Field Line Diversion Properties of Finite β-Helias Equilibria
- Ion Temperature Gradient Modes in Toroidal Helical Systems : Fluids, Plasmas, and Electric Discharges
- Monte-Carlo Simulation of Neoclassical Transport in Magnetic Islands and Ergodic Regions
- Initial Value Problem of the Toroidal Ion Temperature Gradient Mode
- Linear Gyrokinetic Analyses of ITG Modes and Zonal Flows in LHD with High Ion Temperature
- Effect of magnetic reconnection of CT penetration into magnetized plasmas
- Electron Heat Transport in a Self-Similar Structure with Magnetic Islands
- Impulsive Nature in Magnetohydrodynamic Driven Reconnection
- Nonlinear Simulation of Edge-Localized Mode in Spherical Tokamak
- Derivation of the Selected Path Integral
- Formation of Electron-Root Radial Electric Field and its Effect on Thermal Transport in LHD High Te Plasma
- Bootstrap Current Simulations with Experimental LHD Plasma Density and Temperature Profiles, Energy Scattering and Finite Orbit Width
- Development of Computational Technique for Labeling Magnetic Flux-Surfaces
- Non-Local Simulation of the Formation of Neoclassical Ambipolar Electric Field in Non-Axisymmetric Configurations
- Relation among ITG Turbulence, Zonal Flows, and Transport in Helical Plasmas