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Introduction of a multi-species collision operator in GT5D and its application to heavy impurity transport
https://repo.qst.go.jp/records/66958
https://repo.qst.go.jp/records/66958f6acec58-f151-477e-9022-935674378876
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-10-29 | |||||
| タイトル | ||||||
| タイトル | Introduction of a multi-species collision operator in GT5D and its application to heavy impurity transport | |||||
| 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_c94f | |||||
| 資源タイプ | conference object | |||||
| 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 |
Obrejan, Kevin
× Obrejan, Kevin× Idomura, Yasuhiro× Honda, Mitsuru× 井戸村 泰宏× 本多 充 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The use of tungsten to coat divertors or other plasma facing components, as will be the case for ITER, inevitably leads to the pollution of the fusion plasma by heavy and highly charged impurities. Several tokamaks (ASDEX Upgrade, JET) have reported on-axis accumulation of tungsten – which would be detrimental to fusion efficiency – and its exhaust by electron heating. However, this kind of neoclassical and turbulent transport of high-Z impurities is not yet fully understood. To better treat heavy impurities, the gyrokinetic full-f Eulerian simulation code GT5D was recently upgraded with an implicit collision solver based on a multi-species linear Fokker-Plank collision operator. In addition, a flux-coordinate version of the code was developed to accelerate neoclassical simulations and quasi-local turbulence simulations in shaped magnetic configurations. A prior neoclassical benchmark for bulk ions between GT5D and the Hirshman-Sigmar (HS) theory was extended to various impurities in all transport regimes. While a standard low order approximation of the HS theory showed good agreement for light impurities, large differences were observed in the presence of moderate or large temperature gradients. Instead, under such conditions, we tested an improved form of the HS theory, that takes into account higher order flows to more accurately recover the friction coefficients in the Pfirsch-Schlüter regime, showing good agreement with GT5D. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | Numerical Methods for the Kinetic Equations of Plasma Physics (NumKin2018) | |||||
| 発表年月日 | ||||||
| 日付 | 2018-10-23 | |||||
| 日付タイプ | Issued | |||||
