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Study of selected mild steels for application in vacuum systems of future gravitational wave detectors
/ Scarcia, Carlo (CERN ; RWTH Aachen U.) ; Bregliozzi, Giuseppe (CERN) ; Chiggiato, Paolo (CERN) ; Michet, Alice Ingrid (CERN) ; Perez Fontenla, Ana Teresa (CERN) ; Rimoldi, Martino (CERN) ; Taborelli, Mauro (CERN) ; Wevers, Ivo (CERN)
Next-generation gravitational wave detectors (GWDs) like the Cosmic Explorer and Einstein Telescope require extensive vacuum tubing, necessitating cost-effective materials. This study explores the viability of mild steel as an alternative to austenitic stainless steel for UHV beampipes, focusing on outgassing rates and surface chemistry after low-temperature bakeouts. [...]
arXiv:2406.07123.-
2024-09-01 - 17 p.
- Published in : J. Vac. Sci. Technol. B Microelectron. Nanometer Struct.: 42 (2024) , no. 5, pp. 054202
Fulltext: 2406.07123 - PDF; document - PDF;
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Understanding of the LHC warm vacuum module heating
/ Krkotic, Patrick (CERN) ; Baglin, Vincent (CERN) ; Chiggiato, Paolo (CERN) ; Papaphilippou, Yannis (CERN) ; Rumolo, Giovanni (CERN) ; Antuono, Chiara (CERN ; Rome U.) ; Bregliozzi, Giuseppe (CERN) ; Calatroni, Sergio (CERN) ; de la Fuente, Elena (CERN ; Madrid, Polytechnic U.) ; Galloro, Alessio (Calabria U. ; CERN) et al.
During the third run of the Large Hadron Collider in 2023, which had the highest intensity bunch population compared to previous runs, increased losses attributed to pressure spikes within a warm vacuum sector triggered a beam dump. Subsequent inspections revealed localised annealing and plasticisation of the tension spring in the sliding contact radio-frequency finger module, alongside traces of vapour deposition on the various module components with the stainless-steel spring material. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) TUAN3
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.TUAN3
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4.
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New Generation CERN LHC Injection Dump - Assembly and Installation (TDIS)
/ Carbajo Perez, David (CERN) ; Berthomé, Emmanuel (CERN) ; Bertone, Caterina (CERN) ; Biancacci, Nicolo (CERN) ; Bracco, Chiara (CERN) ; Bregliozzi, Giuseppe (CERN) ; Bulat, Bartosz (CERN) ; Cadiou, Cyril (CERN) ; Calviani, Marco (CERN) ; Cattenoz, Gregory (CERN) et al.
During CERN’s LS2, several upgrades were performed to beam intercepting devices in the framework of the HL-LHC Project. Upgraded equipment includes two internal beam dumps (TDIS) intended for machine protection located at the injection points from the SPS to the LHC. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 3548-3551
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3548-3551
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Ultra-high vacuum characterization of molybdenum-carbide graphite for HL-LHC collimators
/ Accettura, Carlotta (CERN ; Milan, Polytech.) ; Beghi, Marco (Milan, Polytech.) ; Bertarelli, Alessandro (CERN) ; Bregliozzi, Giuseppe (CERN) ; Cattenoz, Gregory (CERN) ; Guardia Valenzuela, Jorge (U. Zaragoza (main) ; CERN) ; Redaelli, Stefano (CERN) ; Taborelli, Mauro (CERN) ; Carra, Federico (CERN)
In view of the High-Luminosity upgrade of the Large Hadron Collider (LHC) collimation system, a family of novel molybdenum-carbide graphite (MoGr) composites was developed to meet the challenging requirements of HL-LHC beam-halo collimation, in particular the electrical conductivity and thermo-mechanical performances. The Ultra-High Vacuum (UHV) behaviour of this material was extensively characterized to assess its compatibility with the accelerator’s specifications. [...]
CERN-ACC-2019-160.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-MOPTS093
Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS093
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8.
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Measuring beam size with the LHC Beam Gas Vertex detector
/ Würkner, Benedikt (CERN) ; Alexopoulos, Andreas (CERN) ; Barschel, Colin (CERN) ; Bay, Aurelio (Ecole Polytechnique, Lausanne) ; Blanc, Frederic (Ecole Polytechnique, Lausanne) ; Bravin, Enrico (CERN) ; Bregliozzi, Giuseppe (CERN) ; Chritin, Nicolas (CERN) ; Dehning, Bernd (CERN) ; Ferro-Luzzi, Massimiliano (CERN) et al.
The Beam Gas Vertex detector (BGV) is an innovative beam profile monitor being developed as part of the High Luminosity LHC (HL-LHC) project at CERN. The goal is to continually measure the transverse beam size by reconstructing tracks originating from beam-gas interactions using high precision tracking detectors. [...]
CERN-ACC-2019-205.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-WEPGW084
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPGW084
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9.
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Operational experience of a prototype LHC injection kicker magnet with a low SEY coating and redistributed power deposition
/ Barnes, Michael (CERN) ; Bracco, Chiara (CERN) ; Bregliozzi, Giuseppe (CERN) ; Chmielinska, Agnieszka (Ecole Polytechnique, Lausanne ; CERN) ; Ducimetière, Laurent (CERN) ; Goddard, Brennan (CERN) ; Iadarola, Giovanni (CERN) ; Kramer, Thomas (CERN) ; Vega Cid, Lorena (Madrid, Polytechnic U. ; CERN) ; Vlachodimitropoulos, Vasileios (CERN) et al.
In the event that it is necessary to exchange an LHC injection kicker magnet (MKI), the newly installed kicker magnet would limit operation for a few hundred hours due to dynamic vacuum. A surface coating with a low secondary electron yield, applied to the inner surface of an alumina tube to reduce dynamic vacuum activity without increasing the probability of Unidentified Falling Objects, and which is compatible with the high voltage environment, was included in an upgraded MKI installed in the LHC during the 2017-18 Year End Technical Stop. [...]
CERN-ACC-2019-249.-
2019 - 7 p.
- Published in : (2019) , pp. THPRB072
- Published in : J. Phys.: Conf. Ser. 1350 (2019) 012145
Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPRB072
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