Sputtering tests of single crystal molybdenum and rhodium mirrors at high ion fluence for in situ plasma cleaning of first mirrors in ITER
Sputtering tests of single crystal molybdenum and rhodium mirrors at high ion fluence for in situ plasma cleaning of first mirrors in ITER
复制标题
高离子注量下单晶钼和铑镜的溅射测试，用于 ITER 中第一镜的原位等离子体清洗
DOI：
10.1016/j.fusengdes.2018.01.061
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发表时间：
2018-03
影响因子：
1.7
通讯作者：
Junling Chen
中科院分区：
文献类型：
--
作者：
J. Peng;A.Litnovsky;A.Kreter;Yu.Krasikov;M.Rasinski;U.Breuer;Junling Chen
第一反射镜（FM）预计将用于光学诊断，以查看在ITER燃烧等离子体。考虑到由于反射镜表面上的沉积物导致的FM反射率的急剧下降，等离子体清洗被视为一种至关重要的方法来主动去除沉积物以恢复FM的反射率。单晶钼（Mo）和铑（Rh）反射镜由于在溅射条件下保持良好反射率的能力而被认为是ITER中最有前途的应用材料。为了在ITER原位等离子体清洗的相同条件下寻求SC Mo和Rh反射镜溅射离子注量的可能极限，在线性等离子体装置PSI-2中对它们进行了4 × 1021 cm − 2的高注量氦离子辐照。结果发现，SC Mo和Rh镜都显示出镜面反射率的轻微降低（小于10%）和漫反射率的可忽略不计的增加。在SC Mo镜的情况下，曝光后去除的材料量为900 nm，SC Rh镜为约1500-1900 nm，对应于ITER中约90- 190 in的situcleaning循环。与2015年在2 × 1021 cm − 2的较低注量下的结果相比，所有SC镜的去除材料都表现出合理的线性依赖于离子注量。关于镜面反射率，SC Rh镜表现出几乎相同的退化。SC Mo镜的镜面反射率比在较低能量密度下的镜面反射率具有较小的退化，这一事实可能与晶体取向相关。在不久的将来，将研究作为晶体取向的函数的SC Mo反射镜保持反射率和抵抗等离子体溅射的能力。
First mirrors (FMs) are foreseen to be employed for optical diagnostics to view the burning plasma in ITER. Considering the dramatic degradation of the reflectivity of FMs due to deposits on the mirror surface, plasma cleaning is viewed as a crucially important method to actively remove deposits for recovering reflectivity of FMs. Single crystal (SC) molybdenum (Mo) and rhodium (Rh) mirrors are considered as the most promising materials for the application as FMs in ITER due to the capability of preserving good reflectivity under sputtering conditions. With aim of seeking the possible limit of sputtering ion fluence for SC Mo and Rh mirrors under the same conditions as assumed forin situplasma cleaning of ITER, they underwent the exposure to helium ions with a high fluence of 4 × 1021cm−2in linear plasma device PSI-2. It was found that both SC Mo and Rh mirrors showed a slight reduction of the specular reflectivity (less than 10%) and a negligible increase of diffuse reflectivity. The amount of removed material after exposure in the case of SC Mo mirrors was 900 nm and around 1500–1900 nm for SC Rh mirrors, corresponding to about 90–190in situcleaning cycles in ITER. Compared with the results at lower fluence of 2 × 1021cm−2in 2015, the removed materials of all SC mirrors showed reasonable linear dependence on the ion fluence. Regarding the specular reflectivity, the SC Rh mirrors exhibited nearly the same degradation. The fact that the SC Mo mirrors had less degradation of the specular reflectivity than that at lower fluence, is presumably correlated with crystal orientation. The ability to preserve the reflectivity and resist plasma sputtering for SC Mo mirrors as a function of the crystal orientation will be investigated in the near future.
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影响因子：
3.1
作者：
L. Moser;R. Steiner;F. Leipold;R. Reichle;L. Marot;E. Meyer
通讯作者：
L. Moser;R. Steiner;F. Leipold;R. Reichle;L. Marot;E. Meyer
影响因子：
3.1
作者：
A. Litnovsky;P. Wienhold;V. Philipps;G. Sergienko;O. Schmitz;A. Kirschner;A. Kreter;S. Droste;U. Samm;P. Mertens;A. Donné;D. Rudakov;S. Allen;R. Bolvin;A. Mclean;P. Stangeby;W. West;C. Wong;M. Lipa;B. Schunke;G. D. Temmerman;R. Pitts;A. Costley;V. Voitsenya;K. Vukolov;P. Oelhafen;M. Rubel;A. Romanyuk
通讯作者：
A. Litnovsky;P. Wienhold;V. Philipps;G. Sergienko;O. Schmitz;A. Kirschner;A. Kreter;S. Droste;U. Samm;P. Mertens;A. Donné;D. Rudakov;S. Allen;R. Bolvin;A. Mclean;P. Stangeby;W. West;C. Wong;M. Lipa;B. Schunke;G. D. Temmerman;R. Pitts;A. Costley;V. Voitsenya;K. Vukolov;P. Oelhafen;M. Rubel;A. Romanyuk
DOI：
10.1063/1.2168825
发表时间：
2006-01
期刊：
--
影响因子：
--
作者：
V. Voitsenya
通讯作者：
V. Voitsenya
影响因子：
1.7
作者：
B. Eren;L. Marot;A. Litnovsky;M. Matveeva;R. Steiner;V. Emberger;M. Wisse;D. Mathys;G. Covarel;E. Meyer
通讯作者：
B. Eren;L. Marot;A. Litnovsky;M. Matveeva;R. Steiner;V. Emberger;M. Wisse;D. Mathys;G. Covarel;E. Meyer
影响因子：
1.9
作者：
CASTNER, DG;SEXTON, BA;SOMORJAI, GA
通讯作者：
SOMORJAI, GA