Characterizing W sources in the all-W wall, all-RF WEST tokamak environment( * , * )
文献类型：期刊论文
| 作者 | Klepper, C. C.2; Unterberg, E. A.2; Marandet, Y.3; Curreli, D.4; Grosjean, A.1; Harris, J. H.2; Johnson, C. A.2; Gallo, A.5; Goniche, M.5; Guillemaut, Ch5 |
| 刊名 | PLASMA PHYSICS AND CONTROLLED FUSION
 |
| 出版日期 | 2022-10-01 |
| 卷号 | 64 |
| 关键词 | edge plasma modelling light impurity transport WEST plasma sheath tungsten erosion |
| ISSN号 | 0741-3335 |
| DOI | 10.1088/1361-6587/ac8acc |
| 通讯作者 | Klepper, C. C.(kleppercc@ornl.gov) |
| 英文摘要 | Experimental data, together with interpretive modeling tools, are examined to study trends in the tungsten (W) source in the all-W environment of the WEST tokamak, both from the divertor and from the main chamber. In particular, a poloidal limiter protecting an ion cyclotron resonance heating (ICRH) antenna is used as proxy for main chamber sourcing. The key study is carried out by stepping up lower hybrid current drive (LHCD) power, as the only auxiliary power source. Limiter and divertor W sources exhibit a qualitatively similar proportionality to the total power crossing the separatrix, P (SEP), although the main chamber source remains substantially lower than the divertor source, for the range of P (SEP) accessible in the experiments. Intepretive modeling of the limiter source is carried out with a particle-in-cell (PIC) sheath model coupled to a surface sputtering model. Oxygen is used as a proxy for all light impurity species allowing for characterization of the critical W erosion regions. To get a good quantitative match to the data, it is necessary to assume that the oxygen arrives at the surface mostly at high ionization stages (4+ and above). A separate simulation with SOLEDGE-EIRENE, constrained to measured upstream scrape-off-layer plasma profiles, gives oxygen fractional abundances that are compatible with the PIC simulation result. This is understood to arise from transport processes that dominate over recombination. Substituting the LHCD by ICRH, in an equivalent experiment, the local W source exhibits a 3x enhancement. This can be matched by the simulation, by assuming local RF electric field rectification, based on similar to 100 eV peak-to-peak, near-antennna electric field. This work has highlighted the particular importance of understanding the ion charge state balance of light impurities as these are most likely the dominant sputtering species in fusion devices with high-Z walls. |
| WOS关键词 | PLASMA ; EROSION |
| 资助项目 | US Department of Energy[DE-AC05-00OR22725] ; UT-Battelle, LLC |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000852147300001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | US Department of Energy ; UT-Battelle, LLC |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/128878]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Klepper, C. C. |
| 作者单位 | 1.Univ Tennessee, Dept Nucl Engn, Knoxville, TN 37996 USA 2.Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA 3.Aix Marseille Univ, CNRS, PIIM, UMR 7345, F-13397 Marseille, France 4.Univ Illinois, Nucl Plasma & Radiol Engn, Urbana, IL 61801 USA 5.CEA, IRFM, F-13108 St Paul Les Durance, France 6.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China |
| 推荐引用方式 GB/T 7714 | Klepper, C. C.,Unterberg, E. A.,Marandet, Y.,et al. Characterizing W sources in the all-W wall, all-RF WEST tokamak environment( * , * )[J]. PLASMA PHYSICS AND CONTROLLED FUSION,2022,64. |
| APA | Klepper, C. C..,Unterberg, E. A..,Marandet, Y..,Curreli, D..,Grosjean, A..,...&Urbanczyk, G..(2022).Characterizing W sources in the all-W wall, all-RF WEST tokamak environment( * , * ).PLASMA PHYSICS AND CONTROLLED FUSION,64. |
| MLA | Klepper, C. C.,et al."Characterizing W sources in the all-W wall, all-RF WEST tokamak environment( * , * )".PLASMA PHYSICS AND CONTROLLED FUSION 64(2022). |
入库方式： OAI收割
来源：合肥物质科学研究院
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