Secondary electron yield reduction by femtosecond pulse laser-induced periodic surface structuring
Abstract
The electron-cloud phenomenon is one cause of beam instabilities in high intensity positive particle accelerators. Among the proposed techniques to mitigate or control this detrimental effect, micro-/nano-geometrical modifications of vacuum chamber surfaces are promising to reduce the number of emitted secondary electrons. Femtosecond laser surface structuring readily allows the fabrication of Laser Induced Periodic Surface Structures (LIPSS) and is utilized in several fields, but has not yet been tested for secondary electron emission reduction. In this study, such treatment is carried out on copper samples using linearly and circularly polarized femtosecond laser pulses. The influence of the formed surface textures on the secondary electron yield (SEY) is studied. We investigate the morphological properties as well as the chemical composition by means of SEM, AFM, Raman and XPS analyses. Surface modification with linearly polarized light is more effective than using circularly polarized light, leading to a significant SEY reduction. Even though the SEY maximum is only reduced to a value of ~1.7 compared to standard laser-induced surface roughening approaches, the femtosecond-LIPSS process enables to limit material ablation as well as the production of undesired dust, and drastically reduces the number of redeposited nanoparticles at the surface, which are detrimental for applications in particle accelerators. Moreover, conditioning tests reveal that LIPSS processed Cu can reach SEY values below unity at electron irradiation doses above 10−3 C/mm2.
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BibTeX
@article{nivas2026secondary,
title = {{Secondary electron yield reduction by femtosecond pulse laser-induced periodic surface structuring}},
author = {J.J.J. Nivas and M. Valadan and M. Salvatore and R. Fittipaldi and M. Himmerlich and M. Rimoldi and A. Passarelli and E. Allahyari and S.L. Oscurato and A. Vecchione and C. Altucci and S. Amoruso and A. Andreone and S. Calatroni and M.R. Masullo},
journal = {Surfaces and Interfaces},
year = {2026},
month = oct,
doi = {10.1016/j.surfin.2021.101179},
url = {https://hal.science/hal-05789728v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Secondary electron yield reduction by femtosecond pulse laser-induced periodic surface structuring
AU - J.J.J. Nivas
AU - M. Valadan
AU - M. Salvatore
AU - R. Fittipaldi
AU - M. Himmerlich
AU - M. Rimoldi
AU - A. Passarelli
AU - E. Allahyari
AU - S.L. Oscurato
AU - A. Vecchione
AU - C. Altucci
AU - S. Amoruso
AU - A. Andreone
AU - S. Calatroni
AU - M.R. Masullo
PY - 2026
DA - 2026/10/09
JO - Surfaces and Interfaces
DO - 10.1016/j.surfin.2021.101179
UR - https://hal.science/hal-05789728v1
AB - The electron-cloud phenomenon is one cause of beam instabilities in high intensity positive particle accelerators. Among the proposed techniques to mitigate or control this detrimental effect, micro-/nano-geometrical modifications of vacuum chamber surfaces are promising to reduce the number of emitted secondary electrons. Femtosecond laser surface structuring readily allows the fabrication of Laser Induced Periodic Surface Structures (LIPSS) and is utilized in several fields, but has not yet been tested for secondary electron emission reduction. In this study, such treatment is carried out on copper samples using linearly and circularly polarized femtosecond laser pulses. The influence of the formed surface textures on the secondary electron yield (SEY) is studied. We investigate the morphological properties as well as the chemical composition by means of SEM, AFM, Raman and XPS analyses. Surface modification with linearly polarized light is more effective than using circularly polarized light, leading to a significant SEY reduction. Even though the SEY maximum is only reduced to a value of ~1.7 compared to standard laser-induced surface roughening approaches, the femtosecond-LIPSS process enables to limit material ablation as well as the production of undesired dust, and drastically reduces the number of redeposited nanoparticles at the surface, which are detrimental for applications in particle accelerators. Moreover, conditioning tests reveal that LIPSS processed Cu can reach SEY values below unity at electron irradiation doses above 10−3 C/mm2.
SN - 2468-0230
ER -