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In the derivation of the gyro-reduced-MHD model including the ion diamagnetic effects, finite gyroradius effects of ions are added to the gyrokintic Poisson equation (quasi-neutral condition) and the convection term of the conservation law of the ion density. It is found that the long wavelength approximation, k_perp rho_ti ll 1, where k_perp is the wavenumber perpendicular to the magnetic field and rho_ti is the thermal ion gyroradius, fails to reproduce the correct dispersion relation; the formulation valid even for k_perp rho_ti gg 1 is necessary. The results of numerical calculation coincide with the theory for |omega_ast e| + |omega_ast i| \u003e 2 gamma_0, where the growth rate reduces as the density gradient increases. Here omega_ast e and omega_ast i are electron and ion diamagnetic angular frequencies estimated at the rational surface of q=1(q is a safety factor), respectively, and gamma_0 is the growth rate for the uniform density. Very weak instability, however, is observed for |omega_ast e| + |omega_ast i| \u003e 2 gamma_0, where the theory predicts the complete stabilization. This residual instability appears since the region with the density gradient is limited in the radial direction and the stabilization by the outgoing drift-wave like mode becomes incomplete.\"", "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 2010-02-05T10:18:57Z (GMT). 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Stabilization of Kinetic Internal Kink Mode by Ion Diamagnetic Effects
http://hdl.handle.net/10655/2937
http://hdl.handle.net/10655/29373e97759b-6ba1-4c0b-9975-c8afa5f47519
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 | Stabilization of Kinetic Internal Kink Mode by Ion Diamagnetic Effects | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | tokamak | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | internal kink mode | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | gyrokinetic theory | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | kinetic effect | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | diamagnetic effect | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | gyro-fluid model | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | gyro-reduced-MHD model | |||||
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 |
"Naitou, H.
× "Naitou, H.× Kuramoto, T.× Kobayashi, T.× Yagi, M.× Tokuda, S.× Matsumoto, T." |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | "Ion diamagnetic effects on the m=1(poloidal mode number) and n=1(toroidal mode number) kinetic internal kink mode are studied numerically by the three-field gyro-reduced-MHD code in the cylindrical coordinates, GRM3F-CY. In the derivation of the gyro-reduced-MHD model including the ion diamagnetic effects, finite gyroradius effects of ions are added to the gyrokintic Poisson equation (quasi-neutral condition) and the convection term of the conservation law of the ion density. It is found that the long wavelength approximation, k_perp rho_ti ll 1, where k_perp is the wavenumber perpendicular to the magnetic field and rho_ti is the thermal ion gyroradius, fails to reproduce the correct dispersion relation; the formulation valid even for k_perp rho_ti gg 1 is necessary. The results of numerical calculation coincide with the theory for |omega_ast e| + |omega_ast i| > 2 gamma_0, where the growth rate reduces as the density gradient increases. Here omega_ast e and omega_ast i are electron and ion diamagnetic angular frequencies estimated at the rational surface of q=1(q is a safety factor), respectively, and gamma_0 is the growth rate for the uniform density. Very weak instability, however, is observed for |omega_ast e| + |omega_ast i| > 2 gamma_0, where the theory predicts the complete stabilization. This residual instability appears since the region with the density gradient is limited in the radial direction and the stabilization by the outgoing drift-wave like mode becomes incomplete." | |||||
書誌情報 |
en : Research Report NIFS-Series 発行日 2000-04-01 |
|||||
報告書番号 | ||||||
NIFS-635 | ||||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-633X |