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Toroidal and slab ETG instability dominance in the linear spectrum of JET-ILW pedestals
https://repo.qst.go.jp/records/80839
https://repo.qst.go.jp/records/8083923eba99d-688e-4fa3-b3ee-3b0451b5f938
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2020-10-30 | |||||
| タイトル | ||||||
| タイトル | Toroidal and slab ETG instability dominance in the linear spectrum of JET-ILW pedestals | |||||
| 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 | |||||
| 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 |
F. Parisi, Jason
× F. Parisi, Jason× I. Parra, Felix× M. Roach, Colin× Giroud, Carine× Dorland, William× R. Hatch, David× Barnes, Michael× C. Hillesheim, Jon× Aiba, Nobuyuki× Ball, Justin× G. Ivanov, Plamen× Nobuyuki, Aiba |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Local linear gyrokinetic simulations show that electron temperature gradient (ETG) instabilities are the fastest growing modes for kyρi ≳ 0.1 in the steep gradient region for a JET pedestal discharge (92174) where the electron temperature gradient is steeper than the ion temperature gradient. Here, ky is the wavenumber in the direction perpendicular to both the magnetic field and the radial direction, and ρi is the ion gyroradius. At kyρi ≳ 1, the fastest growing mode is often a novel type of toroidal ETG instability. This toroidal ETG mode is driven at scales as large as kyρi ∼ (ρi/ρe)LTe/R0 ∼ 1 and at a sufficiently large radial wavenumber that electron finite Larmor radius effects become important; that is, Kxρe ∼ 1, where Kx is the effective radial wavenumber. Here, ρe is the electron gyroradius, R0 is the major radius of the last closed flux surface, and 1/LTe is an inverse length proportional to the logarithmic gradient of the equilibrium electron temperature. The fastest growing toroidal ETG modes are often driven far away from the outboard midplane. In this equilibrium, ion temperature gradient instability is subdominant at all scales and kinetic ballooning modes are shown to be suppressed by E × B shear. ETG modes are very resilient to E × B shear. Heuristic quasilinear arguments suggest that the novel toroidal ETG instability is important for transport. | |||||
| 書誌情報 |
Nuclear Fusion 巻 60, 号 12, p. 126045, 発行日 2020-10 |
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| 出版者 | ||||||
| 出版者 | IoP Publishing | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0029-5515 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1088/1741-4326/abb891 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://iopscience.iop.org/article/10.1088/1741-4326/abb891 | |||||
