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Matsuyama, Akinobu; Yagi, Masatoshi; Kagei, Yasuhiro; Nakajima, Noriyoshi*
Nuclear Fusion, 54(12), p.123007_1 - 123007_14, 2014/12
Times Cited Count：15 Percentile：54.38(Physics, Fluids & Plasmas)Matsuyama, Akinobu; Yagi, Masatoshi; Kagei, Yasuhiro*
JPS Conference Proceedings (Internet), 1, p.015037_1 - 015037_4, 2014/03
no abstracts in English
Kagei, Yasuhiro; Tokuda, Shinji
Plasma and Fusion Research (Internet), 3, p.039_1 - 039_5, 2008/07
Kagei, Yasuhiro; Tokuda, Shinji; Miyoshi, Takahiro*
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no abstracts in English
Kagei, Yasuhiro; Tokuda, Shinji; Miyoshi, Takahiro*
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no abstracts in English
Tokuda, Shinji; Kagei, Yasuhiro*
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tokamak plasmasKagei, Yasuhiro; Kishimoto, Yasuaki; Miyoshi, Takahiro*
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Kagei, Yasuhiro; Kishimoto, Yasuaki; Miyoshi, Takahiro*
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plasmas in which internal kink and ballooning instabilities coexist togetherKagei, Yasuhiro; Kishimoto, Yasuaki; Miyoshi, Takahiro*
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Kagei, Yasuhiro; Kishimoto, Yasuaki; Miyoshi, Takahiro*
no journal, ,
no abstracts in English
Kagei, Yasuhiro; Kishimoto, Yasuaki; Miyoshi, Takahiro*
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no abstracts in English
Kagei, Yasuhiro; Kishimoto, Yasuaki; Miyoshi, Takahiro*
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Kagei, Yasuhiro; Tokuda, Shinji
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no abstracts in English
Kagei, Yasuhiro; Tokuda, Shinji
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no abstracts in English
Tokuda, Shinji; Kagei, Yasuhiro
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Kagei, Yasuhiro; Tokuda, Shinji
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Tokuda, Shinji; Shiraishi, Junya; Kagei, Yasuhiro*; Aiba, Nobuyuki
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A new matching scheme is proposed as a numerically tractable implement for linear magnetohydrodynamic (MHD) stability analysis. The essential difference is that each inner layer in the new scheme has finite width including the rational surface and thus the outer regions, which are governed by the Newcomb equation, have no singularity at their terminal points. The matching condition in this scheme is that the normal component of the plasma displacement vector is connected smoothly at the terminal points. It is demonstrated that the new scheme can be applied to the initial value problem of the Frieman-Rotenberg equation to analyze rotation effects on MHD modes.
Tokuda, Shinji; Kagei, Yasuhiro*
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Recently, the authors have proposed, for MHD stability analysis, a numerical matching scheme that introduces a thin inner layer with finite width. In this work we discuss the analytical procedure that solves the inner layer equation by perturbation methods and determines the eigenfunctions and eigenvalues; in the analysis the smallness of the width compared with the plasma radius is exploited. The first order equation gives us the dispersion relation that determines the eigenvalues; the dispersion relation accords with that in the asymptotic matching method. In order to solve the next order equation, we propose the Hamilton-Lie perturbation method with the conjugate variables.
Tokuda, Shinji*; Kagei, Yasuhiro*
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no abstracts in English
Yagi, Masatoshi; Kagei, Yasuhiro*; Matsuyama, Akinobu
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In this presentation, the simulation results on the loss rate for runaway electrons in ITER plasmas will be reported. For this purpose, runaway electron orbit following code is extended such that up-down anti-symmetric equilibrium can be handled as well as up-down symmetric equilibrium. The orbit of runaway electron is followed using drift Hamiltonian model in Boozer co-ordinates. The analytical model for perturbed magnetic field is introduced to simulate magnetic turbulence during disruption phase. The time variation of canonical angular momentum of relativistic electron in the toroidal direction is analyzed in the case with magnetic island. In addition, Poincare plot of particle orbitis done. The preliminary result indicates that the runaway electron is well confined under magnetic perturbation for ITER parameters.
