Characterization of highly radiating nitrogen-seeded H-mode plasmas in unfavorable BT at ASDEX Upgrade
文献类型：期刊论文
| 作者 | Chen, L.1,3 ; Wolfrum, E.3; Pan, O.3; Kurzan, B.3; Bernert, M.3; Brida, D.3; Cavedon, M.2; Dux, R.3; Fischer, R.3; Griener, M.3
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| 刊名 | NUCLEAR FUSION
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| 出版日期 | 2024-12-01 |
| 卷号 | 64 |
| 关键词 | divertor detachment radiative senario impurity seeding unfavorable SOLPS-ITER |
| ISSN号 | 0029-5515 |
| DOI | 10.1088/1741-4326/ad7969 |
| 通讯作者 | Wolfrum, E.(Elisabeth.Wolfrum@ipp.mpg.de) ; Pan, O.(ou.pan@ipp.mpg.de) |
| 英文摘要 | The highly radiating nitrogen-seeded H-mode plasmas in unfavorable BT has been characterized in the ASDEX Upgrade tokamak (AUG). Three levels of nitrogen puffing rates have been injected into a fully detached H-mode plasma, which is run in lower single null configuration with the ion Bx del B drift away from the X-point. A cold ( similar to 1-2 eV) highly radiating ( similar to 13.0MWm(-3)) region forms close to the X-point immediately after nitrogen seeding, as evidenced by measurements of the divertor Thomson scattering (DTS) and the two-dimensional bolometry reconstructions. In addition, the radiator moves further upwards above the X-point along the separatrix at the high-field side (HFS) with increasing nitrogen puffing rates, as evidenced by the Absolute eXtended UltraViolet (AXUV) measurements. The formation of the highly radiating regime is closely correlated to the modifications of the divertor plasma conditions. Along the line of sight of the DTS measurement, the electron temperature reduces down to a few eV, which initials near the X-point and further extends to the HFS scrape-off layer (SOL) simultaneously with the upward movement of the radiator, however, the electron temperature sustains ( similar to 30-50 eV) at the low-field side (LFS) SOL with slightly decreased electron density. The highly radiating regime shows LFS/HFS divertor asymmetry, in contrast to that for H-mode plasmas in favorable BT, suggesting that the drifts play an important role for the formation of the highly radiating X-point regime at AUG. The neutral particle flux increases significantly (factor of similar to 2) in the private flux region, while it increases slightly ( <20%) in the main chamber, thus suggesting an enhanced sub-divertor neutral compression with the formation of the highly radiating regime. Furthermore, a degradation of the pedestal electron density was observed with an enhancement of the electron temperature further inside the pedestal, and complete divertor detachment was achieved by nitrogen seeding with sustained plasma confinement. Finally, particle sources and flow patterns of deuterium and nitrogen ions have been analyzed by SOLPS-ITER modelling, confirming that the ExB drift plays an important role for the formation of the highly radiating regime in unfavorable BT at AUG. |
| 资助项目 | European Union via the Euratom Research and Training Programme[101052200-EUROfusion] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001316854600001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | European Union via the Euratom Research and Training Programme |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/135413]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Wolfrum, E.; Pan, O. |
| 作者单位 | 1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Univ Milano Bicocca, Dipartimento Fis G Occhialini, Milan, Italy 3.Max Planck Inst Plasma Phys, Garching, Germany |
| 推荐引用方式 GB/T 7714 | Chen, L.,Wolfrum, E.,Pan, O.,et al. Characterization of highly radiating nitrogen-seeded H-mode plasmas in unfavorable BT at ASDEX Upgrade[J]. NUCLEAR FUSION,2024,64. |
| APA | Chen, L..,Wolfrum, E..,Pan, O..,Kurzan, B..,Bernert, M..,...&Zito, A..(2024).Characterization of highly radiating nitrogen-seeded H-mode plasmas in unfavorable BT at ASDEX Upgrade.NUCLEAR FUSION,64. |
| MLA | Chen, L.,et al."Characterization of highly radiating nitrogen-seeded H-mode plasmas in unfavorable BT at ASDEX Upgrade".NUCLEAR FUSION 64(2024). |
入库方式： OAI收割
来源：合肥物质科学研究院
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