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The exact incompressible high-n ballooning mode equation for three-dimensional equilibria is solved in the covering space (psi, eta, alpha) where psi and alpha are the labels of the flux surface and the magnetic field line, respectively, and eta is the coordinate along the magnetic field line (-infty \u003c eta \u003c infty). In three-dimensional equilibria, the eigenvalue generally depends on alpha: omega^2 = omega^2 (psi, theta_k, alpha) with theta_k the radial wave number. From the analyses of the local magnetic shear associated with the toroidal force balance, the physical mechanism is clarified why the high-n ballooning modes can be unstable even in the region with stellarator-like global magnetic shear. Such high-n modes have strong alpha-dependence of omega^2 for a peaked pressure profile giving Mercier stable equilibria. In contrast, a broad pressure profile allows high-n modes with weak alpha-dependence of omega^2. The relationship between the high-n and low-n ballooning modes and the related beta limit are also considered through the alpha-dependence of omega^2.\"", "subitem_description_type": "Abstract"}]}, "item_5_source_id_10": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "0915-633X", "subitem_source_identifier_type": "ISSN"}]}, "item_5_text_25": {"attribute_name": "登録情報", "attribute_value_mlt": [{"subitem_text_value": "Made available in DSpace on 2010-02-05T10:16:22Z (GMT). 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Ballooning Modes in Heliotrons/Torsatrons
http://hdl.handle.net/10655/2403
http://hdl.handle.net/10655/2403b6bd10e0-3de2-40da-b908-568262ddf8f5
Item type | 研究報告書 / Research Paper(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2010-02-05 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Ballooning Modes in Heliotrons/Torsatrons | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | ballooning | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | local shear | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | local curvature | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | heliotron | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | torsatron | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_18ws | |||||
資源タイプ | research report | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
"Nakajima, N.
× "Nakajima, N.× Ichiguchi, K.× Okamoto, M.× Dewar, R.L." |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | "The characteristics of the high-n ballooning modes and the corresponding beta ( = kinetic pressure/magnetic pressure) limit are discussed in a planar-axis L = 2/M = 10 heliotron/torsatron with a large Shafranov shift ( L and M are the polarity and toroidal pitch number of helical coils, respectively). The exact incompressible high-n ballooning mode equation for three-dimensional equilibria is solved in the covering space (psi, eta, alpha) where psi and alpha are the labels of the flux surface and the magnetic field line, respectively, and eta is the coordinate along the magnetic field line (-infty < eta < infty). In three-dimensional equilibria, the eigenvalue generally depends on alpha: omega^2 = omega^2 (psi, theta_k, alpha) with theta_k the radial wave number. From the analyses of the local magnetic shear associated with the toroidal force balance, the physical mechanism is clarified why the high-n ballooning modes can be unstable even in the region with stellarator-like global magnetic shear. Such high-n modes have strong alpha-dependence of omega^2 for a peaked pressure profile giving Mercier stable equilibria. In contrast, a broad pressure profile allows high-n modes with weak alpha-dependence of omega^2. The relationship between the high-n and low-n ballooning modes and the related beta limit are also considered through the alpha-dependence of omega^2." | |||||
書誌情報 |
en : Research Report NIFS-Series 発行日 1996-09-01 |
|||||
報告書番号 | ||||||
NIFS-452 | ||||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-633X |