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Title: Reduction of secondary electron yield for E-cloud mitigation laser ablation surface engineering
Authors: Valizadeh, Reza
Malyshev, O.B.
Wang, S.
Sian, T.
Cropper, Michael D.
Sykes, N.
Keywords: Secondary electron yield (SEY)
Electron cloud
Electron multipacting
Laser ablation
Laser surface engineering
Particle accelerators
Issue Date: 2017
Publisher: © Elsevier B.V.
Citation: VALIZADEH, R. ... et al, 2017. Reduction of secondary electron yield for E-cloud mitigation laser ablation surface engineering. Applied Surface Science, 404, pp.370–379
Abstract: 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 (λ = 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.
Description: This paper was accepted for publication in the journal Applied Surface Science and the definitive published version is available at https://doi.org/10.1016/j.apsusc.2017.02.013
Sponsor: European Union’s EuroCirCol collaboration H2020 Framework Programme [grant no. 654305].
Version: Accepted for publication
DOI: 10.1016/j.apsusc.2017.02.013
URI: https://dspace.lboro.ac.uk/2134/24249
Publisher Link: https://doi.org/10.1016/j.apsusc.2017.02.013
ISSN: 0169-4332
Appears in Collections:Published Articles (Physics)

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