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Collisionality Dependence of Mercier Stability in LHD Equilibria with Bootstrap Currents
http://hdl.handle.net/10655/2777
http://hdl.handle.net/10655/2777db39fcbe-d1e3-4cf4-8fed-233f4eb9700c
名前 / ファイル | ライセンス | アクション |
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NIFS-482.pdf (732.8 kB)
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Item type | 研究報告書 / Research Paper(1) | |||||
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公開日 | 2010-02-05 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Collisionality Dependence of Mercier Stability in LHD Equilibria with Bootstrap Currents | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Heliotron/Torsatron | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | MHD | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Mercier stability | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | bootstrap current | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | geometrical factor | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | collisionality of plasma. | |||||
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 | |||||
著者 |
Ichiguchi, K.
× Ichiguchi, K. |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The Mercier stability of the plasmas carrying bootstrap currents with different plasma collisionality is studied in the Large Helical Device (LHD). In the LHD conflguration, the direction of the bootstrap current depends on the collisionality of the plasma through the change in the sign of the geometrical factor. When the beta value is raised by increasing the density of the plasma with a fixed low temperature, the plasma becomes more collisional and the collisionality approaches the plateau regime. In this case, the bootstrap current can flow in the direction so as to decrease the rotational transform. Then, the large Shafranov shift enhances the magnetic well and the magnetic shear, and therefore, the Mercier stability is improved. On the other hand, when the beta value is raised by increasing the temperature of the plasma with a fixed low density, the plasma collisionality becomes reduced to enter the 1/nu collisionality regime and the bootstrap current flows so that the rotational transform should be increased, which is unfavorable for the Mercier stability. Hence, the beta value should be raised by increasing the density rather than the temperature in order to obtain a high beta plasma. | |||||
書誌情報 |
en : Research Report NIFS-Series 発行日 1997-02-01 |
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報告書番号 | ||||||
NIFS-482 | ||||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-633X |