タイトル | Research Report NIFS Series: NIFS-957 |
その他のタイトル | Modelling of ion thermal transport in ergodic region of collesionless toroidal plasma |
著者(日) | 菅野, 龍太郎; 沼波, 政倫; 佐竹, 真介; 高丸, 教尚; 岡本, 正雄; 大藪, 修義 |
著者(英) | Kanno, Ryutaro; Nunami, Masanori; Satake, Shinsuke; Takamaru, Hisanori; Okamoto, Masao; Nobuyoshi, Ohyabu |
著者所属(日) | 核融合科学研究所; 核融合科学研究所; 核融合科学研究所; 中部大学工学部情報工学科; 中部大学工学部情報工学科; 核融合科学研究所 |
著者所属(英) | National Institute for Fusion Science; National Institute for Fusion Science; National Institute for Fusion Science; Department of Computer Science, Chubu University; Department of Computer Science, Chubu University; National Institute for Fusion Science |
発行日 | 2009-09-16 |
発行機関など | National Institute for Fusion Science |
刊行物名 | Research Report NIFS Series |
巻 | NIFS-957 |
開始ページ | 1 |
終了ページ | 27 |
刊行年月日 | 2009-09-16 |
言語 | eng |
抄録 | In recent tokamak experiments it has been found that so-called diffusion theory based on the "diffusion of magnetic field lines" overestimates the radial energy transport in the ergodic region of the collisionless plasma affected by resonant magnetic perturbations (RMPs), though the RMPs induce chaotic behavior of the magnetic field lines. The result implies that the modelling of the transport should be reconsidered for low collisionality cases. A computer simulation study of transport in the ergodic region is required for understanding fundamental properties of collisionless ergodized-plasmas, estimating the transport coefficients, and reconstructing the modelling of the transport. In this paper, we report the simulation study of thermal transport in the ergodic region under the assumption of neglecting effects of an electric field, impurities and neutrals. Because of the simulations neglecting interactions with different particle-species and saving the computational tirne, we treat ions (protons) in our numerical-study of the transport. We find that the thermal diffusivity in the ergodic region is extremely small compared to the one predicted by the theory of field-line diffusion and that the diffusivity depends on both the collision frequency and the strength of RMPs even for the collisionless ergodized-plasma. |
キーワード | thermal transport, diffusion, ergodic region, chaotic field line, resonant magnetic perturbation, collisionless toroidal plasma, delta f simulation, Monte-Carlo method |
資料種別 | Preprint |
ISSN | 0915-633X |
NCID | AA10880482 |
SHI-NO | AA0064415000 |
レポートNO | NIFS-957 |
URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/18178 |
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