Morphological and chemical characterization of laser treated surface on copper

Lucie Baudin (Lead / Corresponding author), Monika Sitko (Lead / Corresponding author), Cédric Garion, Paolo Chiggiato, Francesco Delloro, Fabrice Gaslain, Mohamed Sennour, Michel Jeandin, David Bajek, Stefan Wackerow, Amin Abdolvand

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Electron multipacting and electron cloud have been identified as being the major limiting factors for the beam quality or for the cryogenic system of high-intensity positive particles accelerators. Among conditioning operational techniques and other surface structuration techniques used to decrease the Secondary Electron Yield (SEY) of surfaces, laser surface treatment is a promising method to treat in situ and at atmospheric pressure copper surface of the vacuum chamber. Here, pulsed laser irradiation of copper in parallel lines pattern led to the local ablation and deposition of aggregates of copper particulates on the surface. Tests undertaken at CERN have shown that the modification of the surface morphology by creating roughness at different scales induces a decrease of the SEY by geometrical effects. Nevertheless, the mechanical strength and dust generation of the treated surface have not been addressed yet. In this work, a qualitative analysis of the multi-scale description of the surface morphology was carried out. Scanning Electron Microscopy (SEM), Focused Ion Beam (FIB), Transmission Electron Microscopy (TEM) and Energy Dispersive X-ray Spectroscopy (EDS) were used to investigate morphological characterization such as size and shape of the particulates, chemical composition, metallographic structures and phase transformation on the laser-processed surface. SEM and FIB examinations showed that the surface morphology depends on the local laser energy irradiating the surface and especially, relatively to the ablation threshold. TEM analysis revealed chemical composition and crystalline configuration of the treated material and helped to identify the laser modified and oxidized areas. A variety of superficial structures were observed. Potential vulnerable structures have been identified as oxidized matter redeposited on the ablated near surface. Material continuity and composition play a major role in the mechanical integrity of the generated surface morphology. The adherence of the created structures was assessed analyzing the origin of the dust extracted after mechanical stress.

Original languageEnglish
Title of host publicationSurface Modification Technologies
Subtitle of host publication33rd Surface Modification Technologies Conference (SMT 33)
EditorsPierpaolo Carlone, Antonello Astarita, Antonino Squillace, T.S. Sudarshan
PublisherTrans Tech Publications LTD
Pages254-260
Number of pages7
ISBN (Electronic)9783035735253
ISBN (Print)9783035715255
DOIs
Publication statusPublished - 22 Jul 2019
Event33rd Surface Modification Technologies Conference, SMT 2019 - Naples, Italy
Duration: 26 Jun 201928 Jun 2019

Publication series

NameKey Engineering Materials
PublisherTrans Tech Publications
Volume813
ISSN (Print)1013-9826

Conference

Conference33rd Surface Modification Technologies Conference, SMT 2019
CountryItaly
CityNaples
Period26/06/1928/06/19

Keywords

  • Laser surface treatment
  • Microstructural observations morphological characterization
  • Surface structuration

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