期刊
APPLIED SURFACE SCIENCE
卷 404, 期 -, 页码 370-379出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.02.013
关键词
Secondary electron yield (SEY,); Electron cloud; Electron multipacting; Laser ablation; Laser surface engineering; Particle accelerators
类别
资金
- ASTeC
- Loughborough University
- European Union [654305]
Developing a surface with low Secondary Electron Yield (SEY) is one of the main ways of mitigating electron cloud and beam-induced electron multipacting in high-energy charged particle accelerators. In our previous publications, a low SEY< 0.9 for as-received metal surfaces modified by a nanosecond pulsed laser was reported. In this paper, the SEY of laser-treated blackened copper has been investigated as a function of different laser irradiation parameters. We explore and study the influence of micro- and nano-structures induced by laser surface treatment in air of copper samples as a function of various laser irradiation parameters such as peak power, laser wavelength (lambda=355 nm and 1064 nm), number of pulses per point (scan speed and repetition rate) and fluence, on the SEY. The surface chemical composition was determined by x-ray photoelectron spectroscopy (XPS) which revealed that heating resulted in diffusion of oxygen into the bulk and induced the transformation of CuO to sub-stoichiometric oxide. The surface topography was examined with high resolution scanning electron microscopy (HRSEM) which showed that the laser-treated surfaces are dominated by microstructure grooves and nanostructure features. (C) 2017 Elsevier B.V. All rights reserved.
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