The secondary electron yields and related surface properties evolution of laser treated stainless steel induced by different ultrasonic cleaning duration
The secondary electron yields and related surface properties evolution of laser treated stainless steel induced by different ultrasonic cleaning duration
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不同超声波清洗时间引起的激光处理不锈钢的二次电子产额及相关表面性能演变
DOI：
10.1088/1748-0221/16/06/p06035
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发表时间：
2021
影响因子：
1.3
通讯作者：
Wei Li
中科院分区：
文献类型：
--
作者：
Jie Wang;Yue Wu;Zhiming You;Yong Gao;Jing Zhang;Tianjiao Zhang;Yaocheng Hu;Sheng Wang;Haipeng Li;Zhanglian Xu;Yuntao Liu;Wei Li
采用激光表面改性技术对加速器真空系统常用的316L不锈钢进行表面改性，以降低其二次电子发射。然而，材料表面的最终性质，特别是二次电子产额（SEY）性质取决于相当多的因素，其中包括安装前所需的表面清洁方案。特别地，在用于激光处理的不锈钢表面的超声清洁期间，表面形态和表面化学状态可能改变。为此，首次研究了超声清洗时间对不锈钢表面成分、表面形貌和二次电子特性的影响。二次电子产额测试结果表明，随着超声清洗时间的增加，激光处理不锈钢样品的最大SEY（δ max）增加。在丙酮和无水乙醇中分别超声清洗3 min、10 min和15 min后，激光处理后的不锈钢试样的δ max分别比未经超声清洗的不锈钢试样提高了0.7%~ 1.7%，1.3%~ 2.4%和4.9%~ 15.3%。对与SEY演化相关的表面形貌、表面粗糙度、表面化学状态进行了评价和分析。
As a novel method, laser treatment was proposed to be applied on the surface modification of stainless steel 316L commonly used in accelerator vacuum system to mitigate the secondary electron emission. However, the final property of the material surfaces, especially the secondary electron yield (SEY) property depends on a rather large number of factors, among them are the surface cleaning scenarios needed before installation. In particular, the surface morphologies and surface chemical states may be changed during the ultrasonic cleaning used for laser treated stainless steel surfaces. Therefore, the influence of ultrasonic cleaning duration on the surface composition, surface morphology and secondary electron characteristics of stainless steel were studied for the first time. The secondary electron yield test results demonstrated that the maximum SEY (δ max) of laser treated stainless steel samples increased with the increase of ultrasonic cleaning time. After ultrasonic cleaning in acetone and absolute ethyl alcohol each for 3 minutes, 10 minutes and 15 minutes, respectively, the δ max of laser treated stainless steel samples increased about 0.7%–1.7%, 1.3%–2.4% and 4.9%–15.3%, respectively, compared with that of uncleaned laser treated ones. The surface morphologies, surface roughness, surface chemical states related to the SEY evolution were also evaluated and analyzed.