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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.
|Title of host publication||IPAC 2018|
|Subtitle of host publication||Proceedings of the 9th International Particle Accelerator Conference|
|Editors||Shane Koscielniak, Todd Satogata, Volker R. W. Schaa, Jana Thomson|
|Place of Publication||Geneva|
|Number of pages||4|
|Publication status||Published - Jun 2018|
|Event||9th International Particle Accelerator Conference - Vancouver, Canada|
Duration: 29 Apr 2018 → 4 May 2018
|Conference||9th International Particle Accelerator Conference|
|Period||29/04/18 → 4/05/18|
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- Mechanical and Electronic Engineering - Chair of Functional Materials and Photonics