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  1. 020 学位論文
  2. 物理科学研究科
  3. 10 核融合科学専攻

Theory and Computational Method for the Stability Analysis of External MHD Modes in Toroidal Plasmas

https://ir.soken.ac.jp/records/516
https://ir.soken.ac.jp/records/516
a0aabdbe-1f26-4e1c-b742-6f4d9122f366
名前 / ファイル ライセンス アクション
甲842_要旨.pdf 要旨・審査要旨 (232.7 kB)
甲842_本文.pdf 本文 (4.9 MB)
Item type 学位論文 / Thesis or Dissertation(1)
公開日 2010-02-22
タイトル
タイトル Theory and Computational Method for the Stability Analysis of External MHD Modes in Toroidal Plasmas
タイトル
タイトル Theory and Computational Method for the Stability Analysis of External MHD Modes in Toroidal Plasmas
言語 en
言語
言語 eng
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_46ec
資源タイプ thesis
著者名 相羽, 信行

× 相羽, 信行

相羽, 信行

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フリガナ アイバ, ノブユキ

× アイバ, ノブユキ

アイバ, ノブユキ

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著者 AIBA, Nobuyuki

× AIBA, Nobuyuki

en AIBA, Nobuyuki

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学位授与機関
学位授与機関名 総合研究大学院大学
学位名
学位名 博士(理学)
学位記番号
内容記述タイプ Other
内容記述 総研大甲第842号
研究科
値 物理科学研究科
専攻
値 10 核融合科学専攻
学位授与年月日
学位授与年月日 2005-03-24
学位授与年度
値 2004
要旨
内容記述タイプ Other
内容記述 The theory and analytical model for the stability analysis of magnetohydrodynamic (MHD) modes based on the two-dimensional Newcomb equation are extended for the analysis of external MHD modes both with low-n and with high-n toroidal mode numbers. In this model, since the appropriate weight function and the boundary conditions at rational surfaces are introduced to solve the eigenvalue problem associated with the Newcomb equation, the spectrum of this eigenvalue problem contains only discrete eigenvalues. This feature enables us to reveal explicitly whether plasma is stable or unstable.<br /> In this dissertation, the analytical model is first applied to the development of a new method that analyzes the stability of a low-n external MHD mode in a matrix form, and hence this new method is called the stability matrix method. A numerical code (MARG2D-SM) is developed according to the stability matrix method, and the validity of the code is confirmed by several benchmark tests. The code clarifies the spectral structure of n=1 ideal external kink modes, which are stable or unstable. The spectral gaps induced by the poloidal coupling are also investigated. The stability matrix method reveals the effect of stable ideal internal modes (fixed boundary modes) on the stability of ideal external modes (free boundary modes). With this effect, the mode structure of an ideal external mode changes from a surface mode structure to a global mode structure as a beta value increases, and an external mode destabilizes when an internal mode approaches to their marginal stability; a beta value is a ratio of the plasma pressure to the magnetic pressure. This effect explains how a safety factor profile in the core region of high beta tokamak plasma affects the stability of an ideal external mode. <br /> The model based on the Newcomb equation has an advantage that the marginal stability can be identified only with a short computation time. Such an advantage is demonstrated to be powerful in the study on the aspect ratio dependence of the n=1 ideal external MHD mode stability.<br /> For high-n external MHD modes, the analytical method based on the Newcomb equation is extended in the vacuum region; the vacuum energy integral is calculated by using the vector potential method. The MARG2D code, which solves numerically the eigenvalue problem associated with the two-dimensional Newcomb equation, is adapted to this new model, and the validity of this extension is confirmed by benchmark tests. This extended MARG2D code is developed as a parallel computing code, and enables the fast stability analysis of high-n modes like a peeling mode, an edge ballooning mode, and a couple of them called a peeling-ballooning mode.
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内容記述 application/pdf
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