| Published Articles | |
| Report number | CERN-ACC-2016-157 |
| Title | Vacuum Performance of Amorphous Carbon Coating at Cryogenic Temperature with Presence of Proton Beams |
| Author(s) | Salemme, Roberto (CERN) ; Baglin, Vincent (CERN) ; Bregliozzi, Giuseppe (CERN) ; Chiggiato, Paolo (CERN) |
| Publication | 2016 |
| Number of pages | 4 |
| In: | 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPMY007 |
| DOI | 10.18429/JACoW-IPAC2016-THPMY007 |
| Subject category | Accelerators and Storage Rings |
| Project | CERN HL-LHC |
| Abstract | Amorphous carbon (a-C) coating is the baseline electron multipacting mitigation strategy proposed for the Inner Triplets (IT) in the High Luminosity upgrade of the Large Hadron Collider (HL-LHC). As of 2014, the COLD bore EXperiment (COLDEX) is qualifying the performance of a-C coating at cryogenic temperature in a LHC type cryogenic vacuum system. In this paper, the experimental results following a cryogenic vacuum characterization of a-C coating in the 5 to 150 K temperature range are reviewed. We discuss the dynamic pressure rise, gas composition, dissipated heat load and electron activity observed within an accumulated beam time of 9 Ah. The results of dedicated experiments including pre-adsorption of different gas species (H2, CO) on the a-C coating are discussed. Based of phenomenological modeling, up-to-date secondary emission input parameters for a-C coatings are retrieved for electron cloud build-up simulations. Finally, first implications for the HL-LHC ITs design are drawn. |
| Copyright/License | publication: © 2016-2025 The Author(s) (License: CC-BY-3.0) |
Corresponding record in: Inspire
Record created 2016-08-12, last modified 2022-08-10
