Towards Implementation of Laser Engineered Surface Structures for Electron Cloud Mitigation

M. Sitko (Lead / Corresponding author), V. Baglin, Sergio Calatroni, Paolo Chiggiato, B. Di Girolamo, Elisa Garcia-Tabares Valdivieso, Mauro Taborelli, Amin Abdolvand, David Bajek, Stefan Wackerow, M. Colling, T. J. Jones, P. A. McIntosh

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

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The LHC operation has proven that the electron cloud could be a significant limiting factor in machine performance, in particular for future High Luminosity LHC (HLLHC) beams. Electron clouds, generated by electron multipacting in the beam pipes, lead to beam-induced heat load in cryogenic systems. Laser Engineered Surface Structures (LESS) is a novel surface treatment, which changes the morphology of the internal surfaces of vacuum chambers. The surface modification results in a reduced secondary electron yield (SEY) and, consequently, in the reduction or eradication of the electron multipacting effects. Low SEY values of the treated surfaces and flexibility in choosing the laser parameters make LESS a promising treatment for future accelerators. LESS can be applied both in new and existing accelerators owing to the possibility of automated insitu treatment. This approach has been developed and optimised for selected LHC beam screens in which the electron cloud has to be mitigated before the HL-LHC upgrade. We will present the latest steps towards the implementation of LESS.
Original languageEnglish
Title of host publicationIPAC 2018
Subtitle of host publicationProceedings of the 9th International Particle Accelerator Conference
EditorsShane Koscielniak, Todd Satogata, Volker R. W. Schaa, Jana Thomson
Place of PublicationGeneva
Number of pages4
ISBN (Electronic)9783954501847
Publication statusPublished - Jun 2018
Event9th International Particle Accelerator Conference - Vancouver, Canada
Duration: 29 Apr 20184 May 2018


Conference9th International Particle Accelerator Conference
Internet address


  • electron
  • laser
  • vacuum
  • operation
  • multipactoring


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