Formation of orientation-dependent surface morphologies on tungsten after low energy helium plasma exposure: multiscale characterization and new insights
文献类型：期刊论文
| 作者 | Zhu, Yi-Wen1,2; Li, Yu2; Sun, Yuhan3; Liu, Hao-Dong2; Yang, Xin2; Cheng, Long3; Yuan, Yue3; Lu, Guang-Hong3; Luo, Guang-Nan1,2 ; Zhou, Hai-Shan1,2
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| 刊名 | NUCLEAR FUSION
 |
| 出版日期 | 2024-10-01 |
| 卷号 | 64 |
| 关键词 | helium plasma tungsten plasma-facing components crystal plasticity topographical instability |
| ISSN号 | 0029-5515 |
| DOI | 10.1088/1741-4326/ad6c60 |
| 通讯作者 | Li, Yu(yu.li@ipp.ac.cn) ; Zhou, Hai-Shan(haishanzhou@ipp.ac.cn) |
| 英文摘要 | In ITER, the helium (He) impurity produced by the deuterium-tritium reaction will bombard the tungsten (W) divertor armor at the strike points. Consequently, strong interaction occurs therein that both impact the performance of the plasmas and the lifetime of the divertor. Despite an ever-increasing understanding of this interaction, some experimental phenomena remain mysterious, especially the formation of orientation-dependent surface morphologies. Here, we combine multiscale experimental characterization and theoretical models to shed new light on this problem. After low-energy He plasma exposure in a linear plasma generator, the polycrystalline W surface developed various morphologies. Through electron backscatter diffraction analysis, we found that the {111} grains developed cube-corner structures, the {110} grains developed ripple structures, whereas the {100} grains remained smooth. Then, electron-transparent lamellae were extracted from such grains to observe the subsurface He bubbles by transmission electron microscopy. The volume density, size distribution, and depth range of the He bubbles weakly depend on the crystallographic orientation, suggesting that the migration of W atoms causes the morphology variety. Accordingly, we proposed a two-stage formation mechanism. First, W atoms generated by over-pressurized He bubbles glide on the slip plane and in the slip direction to reach the surface, forming characteristic patterns that are enclosed by the slip traces. Second, morphological instability drives the evolution of the surface patterns, in which the initial surface structure and surface self-diffusion kinetics mediate. The proposed mechanism has been incorporated into a topographical instability model to enable asemi-quantitative analysis. The obtained new insights are valuable to the impurity control of the core plasmas and the lifetime analysis of the divertor for ITER. |
| WOS关键词 | SELF-DIFFUSION |
| 资助项目 | National MCF Energy RD Program[2019YFE03130000] ; National Natural Science Foundation of China[12222510] ; National Natural Science Foundation of China[12192284] ; Comprehensive Research Facility for Fusion Technology Program of China[2018-000052-73-01-001228] ; Collaborative Innovation Program of Hefei Science Center, CAS[2022HSC-CIP010] ; HFIPS Director's Funding[YZJJ2022QN23] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001294909400001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | National MCF Energy RD Program ; National Natural Science Foundation of China ; Comprehensive Research Facility for Fusion Technology Program of China ; Collaborative Innovation Program of Hefei Science Center, CAS ; HFIPS Director's Funding |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/136076]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Li, Yu; Zhou, Hai-Shan |
| 作者单位 | 1.Univ Sci & Technol China, Hefei 230026, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, Hefei Inst Phys Sci, Hefei 230031, Peoples R China 3.Beihang Univ, Sch Phys, Beijing 100191, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu, Yi-Wen,Li, Yu,Sun, Yuhan,et al. Formation of orientation-dependent surface morphologies on tungsten after low energy helium plasma exposure: multiscale characterization and new insights[J]. NUCLEAR FUSION,2024,64. |
| APA | Zhu, Yi-Wen.,Li, Yu.,Sun, Yuhan.,Liu, Hao-Dong.,Yang, Xin.,...&Zhou, Hai-Shan.(2024).Formation of orientation-dependent surface morphologies on tungsten after low energy helium plasma exposure: multiscale characterization and new insights.NUCLEAR FUSION,64. |
| MLA | Zhu, Yi-Wen,et al."Formation of orientation-dependent surface morphologies on tungsten after low energy helium plasma exposure: multiscale characterization and new insights".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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