Study on plasma cleaning of the large-scale first mirror of the charge exchange recombination spectroscopy diagnostic on EAST | |
Peng, Jiao1; Yan, Rong1; Chen, Junling1; Ding, Rui1; Li, Yingying1; Chong, Fali2 | |
刊名 | PLASMA SCIENCE & TECHNOLOGY |
2020-03-01 | |
卷号 | 22 |
关键词 | first mirror CXRS EAST plasma cleaning cleaning uniformity |
ISSN号 | 1009-0630 |
DOI | 10.1088/2058-6272/ab54d3 |
通讯作者 | Yan, Rong(yanrong@ipp.ac.cn) |
英文摘要 | In the Experimental Advanced Superconducting Tokamak (EAST), the reflectivity of the charge exchange recombination spectroscopy (CXRS) first mirror (FM) was dramatically dropped down to 20% of the original value after the operation of two EAST experimental campaigns from 2014-2015, leading to degradation of the signal intensity of the CXRS diagnostic to an unacceptably low level. The radio frequency (RF) plasma cleaning of the CXRS FM with a dimension of 303 x 81 x 76 mm(3) and a small curvature of 0.008 mm(-1) was performed to remove deposits to recover the reflectivity. After 168 h cleaning by RF plasma, the maximum specular reflectivity of the FM could reach 92% of the original value at 532 nm, making the cleaned CXRS FM eligible to be reused for the CXRS diagnostic in the 2016 EAST campaign. Dedicated tests of sputtering polished mirror samples were performed to explore the cleaning uniformity and possible damage to the mirror surface. The specular reflectivity did not show obvious dependence on locations along the surface with the same cleaning time. The measured surface roughness gradually increased with sputtering time. The reflectivity remained almost unchanged regardless of different sputtering times and locations, indicating negligible damage to the FM surface even after 100 h sputtering. The recontaminated CXRS FM in the 2016 EAST campaign was firstly cleaned for 81 h, and the least reflectivity recovery for areas with relatively thick deposits was only 40%. After continuing cleaning to 147 h, redeposition of the sputtered residual deposits on the FM surface was observed. In the future for in situ cleaning of the FMs in EAST and ITER, deposits should be removed timely when they are very thin taking into account a very long cleaning time and presumable redeposition of thick and nonuniform deposits. |
资助项目 | National Natural Science Foundation of China[11975269] ; National Natural Science Foundation of China[11905252] ; National Natural Science Foundation of China[11675218] ; National Natural Science Foundation of China[11675219] ; National Natural Science Foundation of China[11775260] ; National Natural Science Foundation of China[11861131010] ; National Natural Science Foundation of China[11875230] ; National Key R&D Program of China[2017YFA0402500] ; National Key R&D Program of China[2017YFE0301300] |
WOS关键词 | SINGLE-CRYSTAL |
WOS研究方向 | Physics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000537711300001 |
资助机构 | National Natural Science Foundation of China ; National Key R&D Program of China |
内容类型 | 期刊论文 |
源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/103087] |
专题 | 中国科学院合肥物质科学研究院 |
通讯作者 | Yan, Rong |
作者单位 | 1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Xuzhou Univ Technol, Xuzhou 221000, Jiangsu, Peoples R China |
推荐引用方式 GB/T 7714 | Peng, Jiao,Yan, Rong,Chen, Junling,et al. Study on plasma cleaning of the large-scale first mirror of the charge exchange recombination spectroscopy diagnostic on EAST[J]. PLASMA SCIENCE & TECHNOLOGY,2020,22. |
APA | Peng, Jiao,Yan, Rong,Chen, Junling,Ding, Rui,Li, Yingying,&Chong, Fali.(2020).Study on plasma cleaning of the large-scale first mirror of the charge exchange recombination spectroscopy diagnostic on EAST.PLASMA SCIENCE & TECHNOLOGY,22. |
MLA | Peng, Jiao,et al."Study on plasma cleaning of the large-scale first mirror of the charge exchange recombination spectroscopy diagnostic on EAST".PLASMA SCIENCE & TECHNOLOGY 22(2020). |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论