Valizadeh, Reza Malyshev, O.B. Wang, S. Sian, T. Cropper, Michael Sykes, N. Reduction of secondary electron yield for E-cloud mitigation laser ablation surface engineering 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. Secondary electron yield (SEY);Electron cloud;Electron multipacting;Laser ablation;Laser surface engineering;Particle accelerators;Physical Sciences not elsewhere classified 2017-02-28
    https://repository.lboro.ac.uk/articles/journal_contribution/Reduction_of_secondary_electron_yield_for_E-cloud_mitigation_laser_ablation_surface_engineering/9408356