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Simulation study of stepwise relaxation in a spheromak plasma
http://hdl.handle.net/10655/1303
http://hdl.handle.net/10655/1303dede714e-1055-4b49-8ecc-3f98c4d8aefc
名前 / ファイル | ライセンス | アクション |
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2369 PFB000672.pdf (1.5 MB)
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VoR_Phy.Flui.B4_672 (1.6 MB)
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Item type | 学術雑誌論文 / Journal Article_02(1) | |||||
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公開日 | 2009-05-08 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Simulation study of stepwise relaxation in a spheromak plasma | |||||
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_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Horiuchi, Ritoku
× Horiuchi, Ritoku× Sato, Tetsuya× Uchida, Masaya |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The energy relaxation process of a spheromak plasma in a flux conserver is investigated by means of a three-dimensional magnetohydrodynamic simulation. The resistive decay of an initial force-free profile brings the spheromak plasma to an m=1/n=2 ideal kink unstable region. It is found that the energy relaxation takes place in two steps; namely, the relaxation consists of two physically distinguished phases, and there exists an intermediate phase in between, during which the relaxation becomes inactive temporarily. The first relaxation corresponds to the transition from an axially symmetric force-free state to a helically symmetric one with an n=2 crescent magnetic island structure via the helical kink instability. The n=2 helical structure is nonlinearly sustained in the intermediate phase. The helical twisting of the flux tube creates a reconnection current in the vicinity of the geometrical axis. The second relaxation is triggered by the rapid growth of the n=1 mode when the reconnection current exceeds a critical value. The helical twisting relaxes through magnetic reconnection toward an axially symmetric force-free state. It is also found that the poloidal flux reduces during the helical twisting in the first relaxation and the generation of the toroidal flux occurs through the magnetic reconnection process in the second relaxation. | |||||
書誌情報 |
en : Physics of Fluids B 巻 Vol.4, 号 No.3, p. pp.672-682, 発行日 1992-03-01 |
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出版者 | ||||||
出版者 | American Institute of Physics | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1063/1.860265 | |||||
関連サイト | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1063/1.860265 | |||||
関連名称 | Publisher version | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 |