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Gyrokinetic modelling of the quasilinear particle flux for plasmas with neutral-beam fuelling
https://repo.qst.go.jp/records/48603
https://repo.qst.go.jp/records/486030c99ad61-e001-4008-9a62-b97357793647
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-03-20 | |||||
| タイトル | ||||||
| タイトル | Gyrokinetic modelling of the quasilinear particle flux for plasmas with neutral-beam fuelling | |||||
| 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 |
成田, 絵美
× 成田, 絵美× 本多, 充× 仲田, 資季× 吉田, 麻衣子× 竹永, 秀信× 林, 伸彦× 成田 絵美× 本多 充× 吉田 麻衣子× 竹永 秀信× 林 伸彦 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | A quasilinear particle flux is modelled based on gyrokinetic calculations. The particle flux is estimated by determining factors, namely, coefficients of off-diagonal terms and a particle diffusivity. In this paper, the methodology to estimate the factors is presented using a subset of JT-60U plasmas. First, the coefficients of off-diagonal terms are estimated by linear gyrokinetic calculations. Next, to obtain the particle diffusivity, a semi-empirical approach is taken. Most experimental analyses for particle transport have assumed that turbulent particle fluxes are zero in the core region. On the other hand, even in the stationary state, the plasmas in question have a finite turbulent particle flux due to neutral-beam fuelling. By combining estimates of the experimental turbulent particle flux and the coefficients of off-diagonal terms calculated earlier, the particle diffusivity is obtained. The particle diffusivity should reflect a saturation amplitude of instabilities. The particle diffusivity is investigated in terms of the effects of the linear instability and linear zonal flow response, and it is found that a formula including these effects roughly reproduces the particle diffusivity. The developed framework for prediction of the particle flux is flexible to add terms neglected in the current model. The methodology to estimate the quasilinear particle flux requires so low computational cost that a database consisting of the resultant coefficients of off-diagonal terms and particle diffusivity can be constructed to train a neural network. The development of the methodology is the first step towards a neural-network- based particle transport model for fast prediction of the particle flux. | |||||
| 書誌情報 |
Plasma Physics and Controlled Fusion 巻 60, 号 2, p. 025027-1-025027-10, 発行日 2018-01 |
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| 出版者 | ||||||
| 出版者 | IOP Publishing | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1088/1361-6587/aaa02d | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://iopscience.iop.org/article/10.1088/1361-6587/aaa02d | |||||
| 関連名称 | http://iopscience.iop.org/article/10.1088/1361-6587/aaa02d | |||||
