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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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The mechanical behavior of the EIC beam screen during a magnet quench
/ Morrone, Marco (CERN) ; Garion, Cedric (CERN) ; Hetzel, Charles (Brookhaven Natl. Lab.) ; Chiggiato, Paolo (CERN)
As part of the Electron-Ion Collide (EIC) upgrade at Brookhaven National Laboratory (BNL), the development of new beam screens for the vacuum system is underway. The mechanical design of the beam screens received support from CERN, particularly in addressing the mechanical response during a magnet quench, i.e. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) TUPR59
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.TUPR59
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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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Investigation of the nucleon distribution on the surface of radioactive xenon nuclei using antiprotons
/ Aberle, Oliver (CERN, 1211 Geneva 23, Switzerland) ; Aumann, Tom (Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany) ; Azaryan, Nikolay (CERN, 1211 Geneva 23, Switzerland) ; Bissell, Mark Lloyd (CERN, 1211 Geneva 23, Switzerland) ; Boine-Frankenheim, Oliver (Institut für Teilchenbeschleunigung und elektromagnetische Felder, Technische Universität Darmstadt, 64289 Darmstadt, Germany) ; Bonnes, Uwe (Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany) ; Butin, Francois (CERN, 1211 Geneva 23, Switzerland) ; Chiggiato, Paolo (CERN, 1211 Geneva 23, Switzerland) ; De Gersem, Herbert (Institut für Teilchenbeschleunigung und elektromagnetische Felder, Technische Universität Darmstadt, 64289 Darmstadt, Germany) ; De Oliveira, Rui (CERN, 1211 Geneva 23, Switzerland) et al.
CERN-INTC-2024-055 ; INTC-P-712.
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2024
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Picosecond pulsed 532 nm laser system for roughening and secondary electron yield reduction of inner surfaces of up to 15 m long tubes
/ Bez, Elena (CERN ; Leipzig U.) ; Himmerlich, Marcel (CERN) ; Beaudou, Benoit (XLIM, Limoges) ; Portilla, Ana Karen Reascos (CERN) ; Wackerow, Stefan (U. Dundee) ; Rimoldi, Martino (CERN) ; Pfeiffer, Stephan (CERN) ; Wiesendanger, Markus (Zurich U.) ; Benabid, Fetah (XLIM, Limoges) ; Taborelli, Mauro (CERN) et al.
Laser-induced surface structuring is a promising method to suppress electron mulitpacting in the vacuum pipes of particle accelerators. Electrons are scattered inside the rough surface structure, resulting in a low Secondary Electron Yield (SEY) of the material. [...]
2023 - 11 p.
- Published in : Rev. Sci. Instrum. 94 (2023) 103007
Fulltext: PDF;
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Influence of wavelength and accumulated fluence at picosecond laser-induced surface roughening of copper on secondary electron yield
/ Bez, Elena (CERN ; Leipzig U.) ; Himmerlich, Marcel (CERN) ; Lorenz, Pierre ; Ehrhardt, Martin ; Gunn, Aidan Graham (CERN) ; Pfeiffer, Stephan (CERN) ; Rimoldi, Martino (CERN) ; Taborelli, Mauro (CERN) ; Zimmer, Klaus ; Chiggiato, Paolo (CERN) et al.
Ultrashort-pulse laser processing of copper is performed in air to reduce the secondary electron yield (SEY). By UV (355 nm), green (532 nm), and IR (1064 nm) laser-light induced surface modification, this study investigates the influence of the most relevant experimental parameters, such as laser power, scanning speed, and scanning line distance (represented as accumulated fluence) on the ablation depth, surface oxidation, topography, and ultimately on the SEY. [...]
2023 - 10 p.
- Published in : J. Appl. Phys. 133 (2023) 035303
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Origin and Mitigation of the Beam-Induced Surface Modifications of the LHC Beam Screens
/ Petit, Valentine (CERN) ; Chiggiato, Paolo (CERN) ; Himmerlich, Marcel (CERN) ; Marinoni, Stefano (CERN) ; Neupert, Holger (CERN) ; Taborelli, Mauro (CERN) ; Tavian, Laurent (CERN)
All over Run 2, the LHC beam-induced heat load on the cryogenic system exhibited a wide scattering along the ring. Studies ascribed the heat source to electron cloud build-up, indicating an unexpected high Secondary Electron Yield (SEY) of the beam screen surface in some LHC regions. [...]
2022 - 3 p.
- Published in : JACoW IPAC 2022 (2022) 780-782
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.780-782
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