Study on plasma cleaning of the large-scale first mirror of the charge exchange recombination spectroscopy diagnostic on EAST
Study on plasma cleaning of the large-scale first mirror of the charge exchange recombination spectroscopy diagnostic on EAST
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EAST电荷交换复合光谱诊断大型第一镜等离子体清洗研究
DOI：
10.1088/2058-6272/ab54d3
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发表时间：
2020-03
影响因子：
1.7
通讯作者：
Chong Fali
中科院分区：
文献类型：
--
作者：
Peng Jiao;Yan Rong;Chen Junling;Ding Rui;Li Yingying;Chong Fali
在EAST中，电荷交换复合光谱（CXRS）FM的反射率在2014年至2015年的两次EAST实验活动运行后急剧下降至原始值的20%，导致CXRS诊断的信号强度下降至不可接受的低水平。对尺寸为303 ×81 ×76 mm 3、曲率为0.008 mm-1的CXRS FM进行射频等离子体清洗，去除沉积物，恢复反射率。经过168小时的清洁，FM的最大镜面反射率在532 nm处可达到原始值的92%，使得清洁后的CXRS FM有资格在2016年EAST活动中重新用于CXRS诊断。对溅射抛光镜样品进行了专门的测试，以探索清洁均匀性和可能对镜面造成的损坏。在相同的清洗时间下，镜面反射率没有表现出明显的位置沿着表面的依赖性。测量的表面粗糙度随着溅射时间逐渐增加。反射率几乎保持不变，无论不同的溅射时间和位置，表明即使是100 h的溅射FM表面的损伤可以忽略不计。2016年EAST活动中再污染的CXRS FM首次清洁81 h，相对厚沉积物的区域的反射率恢复最小仅为40%。在继续清洁至147小时后，观察到FM表面上的溅射残余沉积物的再沉积。在EAST和ITER未来的FM原位清洗中，考虑到清洗时间较长以及厚且不均匀的沉积物可能发生再沉积，当沉积物很薄时应及时去除。
In EAST, the reflectivity of charge exchange recombination spectroscopy (CXRS) FM was dramatically dropped down to 20% of the original value after the operation of two EAST experimental campaigns from 2014 to 2015, leading to degradation of the signal intensity of the CXRS diagnostic to an unacceptably low level. The radio frequency plasma cleaning of the CXRS FM with a dimension of 303 ×81 ×76 mm3 and a small curvature of 0.008 mm–1 was performed to remove deposits for recovering the reflectivity. After 168 h cleaning, the maximum specular reflectivity of the FM can 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 kept almost unchanged regardless of different sputtering time and locations, indicating negligible damage to the FM surface even for 100 h sputtering. The re-contaminated CXRS FM in the 2016 EAST campaign was firstly cleaned for 81 h, the least reflectivity recovery for areas with relatively thick deposits was only 40%. After continuing cleaning to 147 h, the re-deposition of the sputtered residual deposits on the FM surface was observed. In the future in situ cleaning of FMs of EAST and ITER, deposits should be removed timely when they are very thin taking into account very long cleaning time and presumable re-deposition for thick and non-uniform deposits.
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影响因子：
3.1
作者：
周艳
通讯作者：
周艳
影响因子：
3.3
作者：
A. Maffini;L. Moser;L. Marot;R. Steiner;D. Dellasega;A. Uccello;E. Meyer;M. Passoni
通讯作者：
A. Maffini;L. Moser;L. Marot;R. Steiner;D. Dellasega;A. Uccello;E. Meyer;M. Passoni
EAST CXRS 第一个镜子的表面恢复
影响因子：
1.5
作者：
Rong Yan;Jiao Peng;Rui Ding;Yingying Li;Xianghui Yin;Baoguo Wang;Junling Chen
通讯作者：
Junling Chen
影响因子：
1.7
作者：
Jiao Peng;R. Yan;R. Ding;Junling Chen;Dahuan Zhu;Zengming Zhang
通讯作者：
Jiao Peng;R. Yan;R. Ding;Junling Chen;Dahuan Zhu;Zengming Zhang
DOI：
10.1016/j.fusengdes.2017.03.053
发表时间：
2017-11
期刊：
--
影响因子：
--
作者：
A. Litnovsky;Y. Krasikov;M. Rasinski;A. Kreter;C. Linsmeier;P. Mertens;B. Unterberg;U. Breuer;T. Wegener
通讯作者：
A. Litnovsky;Y. Krasikov;M. Rasinski;A. Kreter;C. Linsmeier;P. Mertens;B. Unterberg;U. Breuer;T. Wegener