First beam test of Laser Engineered Surface Structures (LESS) at cryogenic temperature in CERN SPS accelerator

R. Salemme (Lead / Corresponding author), V. Baglin, Sergio Calatroni, Paolo Chiggiato, B. Di Girolamo, Elisa Garcia-Tabares Valdivieso, B. Jenninger, L. Prever-Loiri, M. Sitko, Stefan Wackerow, Amin Abdolvand

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Electron cloud mitigation is an essential requirement for accelerators of positive particles with high intensity beams to guarantee beam stability and limited heat load in cryogenic systems. Laser Engineered Surface Structures (LESS) are being considered, within the High Luminosity upgrade of the LHC collider at CERN (HL-LHC), as an option to reduce the Secondary Electron Yield (SEY) of the surfaces facing the beam, thus suppressing the electron cloud phenomenon. As part of this study, a 2.2 m long Beam Screen (BS) with LESS has been tested at cryogenic temperature in the COLD bore EXperiment (COLDEX) facility in the SPS accelerator at CERN. In this paper, we describe the manufacturing procedure of the beam screen, the employed laser treatment technique and discuss our first observations in COLDEX confirming electron cloud suppression.
Original languageEnglish
Article number082017
Pages (from-to)1-6
Number of pages6
JournalJournal of Physics: Conference Series
Early online date5 Oct 2018
Publication statusPublished - 2018
Event9th International Particle Accelerator Conference - Vancouver, Canada
Duration: 29 Apr 20184 May 2018


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