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Assessment of the impact of the kinetic effect of ion parallel heat conduction on DEMO relevant SOL plasma using integrated SOL divertor code SONIC
https://repo.qst.go.jp/records/85339
https://repo.qst.go.jp/records/85339ca527a60-122d-436f-a219-e53a181ac5c5
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2022-03-07 | |||||
| タイトル | ||||||
| タイトル | Assessment of the impact of the kinetic effect of ion parallel heat conduction on DEMO relevant SOL plasma using integrated SOL divertor code SONIC | |||||
| 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 |
Yuuki, Homma
× Yuuki, Homma× Yuuki, Homma |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | In plasmas of lower collisionality, such as the scrape-off layer (SOL) of a fusion tokamak device, the parallel heat conductivity of ions becomes smaller than the classical Spitzer–Harm model due to a nonlocal kinetic effect. We have assessed, by simulation, the impact and role of the kinetic effect of ion heat conductivity (abbreviated as ion KE in this paper) on DEMO-relevant tokamak SOL plasma, using the Japanese demonstration tokamak reactor concept JA DEMO. A series of test simulations, where the ion KE is modeled by a widely used free-streaming energy (FSE)-limited model, has demonstrated: (a) the ion KE decreases the ion parallel heat flux density in JA DEMO SOL (at the baseline operation scenario) around the X-point and further upstream of the low-field side (LFS) area along the separatrix, where the parallel collisionality is smaller. Up to 40%–60% decrease is observed, compared to the case without (w/o) ion KE, among the test cases where the ion KE level is scanned over the possible range (i.e. parameter αi of the FSE-limited model is varied over $0.2 \leqslant \alpha _{\textrm{i}} \leqslant 2.0$); (b) the ion KE leads to significant increase in the ion temperature Ti (up to 600% increase) and significant decrease in the ion density ni (up to −80%) over wide area of the SOL upstream. Energy balance analysis has suggested that the ion KE affects the upstream ni and Ti by the power of 0.4 and −0.4, respectively, of the flux limiting factor, as long as spatial changes in plasma parameters are moderate. The results of this study serve as a fundamental assessment of the ion KE for DEMO- relevant SOL plasma, clarifying the need for further sophistication of the model toward more quantitative prediction. | |||||
| 書誌情報 |
Plasma Physics and Controlled Fusion 巻 64, p. 045020, 発行日 2022-03 |
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| 出版者 | ||||||
| 出版者 | IOP Science | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0741-3335 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1088/1361-6587/ac48bd | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://iopscience.iop.org/article/10.1088/1361-6587/ac48bd | |||||
