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

Fingerprint

Copper
Lasers
Surface morphology
Electrons
Focused ion beams
Ablation
Chemical analysis
Dust
Transmission electron microscopy
Scanning electron microscopy
Beam quality
Laser beam effects
Pulsed lasers
Cryogenics
Atmospheric pressure
Strength of materials
Particle accelerators
Surface treatment
Energy dispersive spectroscopy
Surface roughness

Keywords

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

Cite this

Baudin, L., Sitko, M., Garion, C., Chiggiato, P., Delloro, F., Gaslain, F., ... Abdolvand, A. (2019). Morphological and chemical characterization of laser treated surface on copper. In P. Carlone, A. Astarita, A. Squillace, & T. S. Sudarshan (Eds.), Surface Modification Technologies: 33rd Surface Modification Technologies Conference (SMT 33) (pp. 254-260). (Key Engineering Materials; Vol. 813). Trans Tech Publications LTD. https://doi.org/10.4028/www.scientific.net/KEM.813.254
Baudin, Lucie ; Sitko, Monika ; Garion, Cédric ; Chiggiato, Paolo ; Delloro, Francesco ; Gaslain, Fabrice ; Sennour, Mohamed ; Jeandin, Michel ; Bajek, David ; Wackerow, Stefan ; Abdolvand, Amin. / Morphological and chemical characterization of laser treated surface on copper. Surface Modification Technologies: 33rd Surface Modification Technologies Conference (SMT 33). editor / Pierpaolo Carlone ; Antonello Astarita ; Antonino Squillace ; T.S. Sudarshan. Trans Tech Publications LTD, 2019. pp. 254-260 (Key Engineering Materials).
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Baudin, L, Sitko, M, Garion, C, Chiggiato, P, Delloro, F, Gaslain, F, Sennour, M, Jeandin, M, Bajek, D, Wackerow, S & Abdolvand, A 2019, Morphological and chemical characterization of laser treated surface on copper. in P Carlone, A Astarita, A Squillace & TS Sudarshan (eds), Surface Modification Technologies: 33rd Surface Modification Technologies Conference (SMT 33). Key Engineering Materials, vol. 813, Trans Tech Publications LTD, pp. 254-260, 33rd Surface Modification Technologies Conference, SMT 2019, Naples, Italy, 26/06/19. https://doi.org/10.4028/www.scientific.net/KEM.813.254

Morphological and chemical characterization of laser treated surface on copper. / Baudin, Lucie (Lead / Corresponding author); Sitko, Monika (Lead / Corresponding author); Garion, Cédric; Chiggiato, Paolo; Delloro, Francesco; Gaslain, Fabrice; Sennour, Mohamed; Jeandin, Michel; Bajek, David; Wackerow, Stefan; Abdolvand, Amin.

Surface Modification Technologies: 33rd Surface Modification Technologies Conference (SMT 33). ed. / Pierpaolo Carlone; Antonello Astarita; Antonino Squillace; T.S. Sudarshan. Trans Tech Publications LTD, 2019. p. 254-260 (Key Engineering Materials; Vol. 813).

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

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T1 - Morphological and chemical characterization of laser treated surface on copper

AU - Baudin, Lucie

AU - Sitko, Monika

AU - Garion, Cédric

AU - Chiggiato, Paolo

AU - Delloro, Francesco

AU - Gaslain, Fabrice

AU - Sennour, Mohamed

AU - Jeandin, Michel

AU - Bajek, David

AU - Wackerow, Stefan

AU - Abdolvand, Amin

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N2 - 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.

AB - 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.

KW - Laser surface treatment

KW - Microstructural observations morphological characterization

KW - Surface structuration

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M3 - Conference contribution

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SN - 9783035715255

T3 - Key Engineering Materials

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EP - 260

BT - Surface Modification Technologies

A2 - Carlone, Pierpaolo

A2 - Astarita, Antonello

A2 - Squillace, Antonino

A2 - Sudarshan, T.S.

PB - Trans Tech Publications LTD

ER -

Baudin L, Sitko M, Garion C, Chiggiato P, Delloro F, Gaslain F et al. Morphological and chemical characterization of laser treated surface on copper. In Carlone P, Astarita A, Squillace A, Sudarshan TS, editors, Surface Modification Technologies: 33rd Surface Modification Technologies Conference (SMT 33). Trans Tech Publications LTD. 2019. p. 254-260. (Key Engineering Materials). https://doi.org/10.4028/www.scientific.net/KEM.813.254