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1.
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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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2.
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Cleaning of laser-induced periodic surface structures on copper by gentle wet chemical processing
/ Lorenz, Pierre (TROPOS, Leibniz) ; Ehrhardt, Martin (TROPOS, Leibniz) ; Lotnyk, Andriy (TROPOS, Leibniz) ; Griebel, Jan (TROPOS, Leibniz) ; Zimmer, Klaus (TROPOS, Leibniz) ; Zajadacz, Joachim (TROPOS, Leibniz) ; Himmerlich, Marcel (CERN) ; Bez, Elena (CERN ; Leipzig U.) ; Taborelli, Mauro (CERN) ; Rosenow, Steffen (Leipzig U.) et al.
•Cleaning of 365 nm LIPSS from debris of with microemulsions has been demonstrated.•Excellent debris and particles removal while maintaining the LIPSS pattern were found.•The cleaning mechanism is dominated of selective dissolution of nanomaterial and oxides. Laser-induced periodic surface structures (LIPSS) attract considerable attention due to the manifold applications enabled by these self-organised structures ranging from optical colouring to bio-mimicking or wetting effects. [...]
2024 - 10 p.
- Published in : Appl. Surf. Sci. 679 (2025) 161115
Fulltext: PDF;
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3.
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4.
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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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5.
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Secondary electron yield engineering of copper surfaces using ultra short infrared laser pulses
/ Lorenz, Pierre ; Himmerlich, Marcel (CERN) ; Ehrhardt, Martin ; Bez, Elena (CERN) ; Bogdanowicz, Karolina (CERN) ; Taborelli, Mauro (CERN) ; Zimmer, Klaus
The texturing of copper surfaces with ultrashort laser pulses leads to microscopic groove formation but results also in nanostructure development at the surface. Both structure types, micro- and nanostructures, are influenced by the laser processing parameters such as the laser power, the scanning speed, the repetition rate, and the line spacing. [...]
2022
- Published in : 10.1117/12.2609463
In : Laser-based Micro- and Nanoprocessing XVI, San Francisco, California, United States, 22 -27 Jan 2022
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6.
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On the Use of Oxidation Induction Time as a Kinetic Parameter for Condition Monitoring and Lifetime Evaluation under Ionizing Radiation Environments
/ Lungulescu, Eduard-Marius (Bucharest, Adv. Res. Inst. Electr. Engin.) ; Setnescu, Radu (Bucharest, Adv. Res. Inst. Electr. Engin.) ; Ilie, Sorin (CERN) ; Taborelli, Mauro (CERN)
The durability of polymeric materials is closely linked to their degradation under specific operating conditions when different stressors—general or specific, such as high temperature, sunlight or ionizing radiation, solvents, or mechanical stresses—act simultaneously, causing degradation. In the case of electrical cables, the durability of the electrically insulating materials used in their construction is an important parameter to ensure their operational security. [...]
2022 - 22 p.
- Published in : Polymers 14 (2022) 2357
Fulltext: PDF;
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7.
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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
Fulltext: PDF;
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8.
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Efficient Combination of Surface Texturing and Functional Coating for Very Low Secondary Electron Yield Surfaces and Rough Nonevaporable Getter Films
/ Himmerlich, Marcel (CERN) ; Zanin, Danilo A (CERN) ; Taborelli, Mauro (CERN) ; Granadeiro Costa, Angelo Rafael (CERN) ; Costa Pinto, Pedro (CERN) ; Lain Amador, Lucia (CERN) ; Vollenberg, Wilhelmus (CERN) ; Baris, Adrienn (CERN) ; Garcia‐Tabares Valdivieso, Elisa (CERN ; Carlos III U., Madrid) ; Perez Fontenla, Ana Teresa (CERN) et al.
The formation of a fissured copper surface by picosecond pulsed laser irradiation is combined with functional coatings consisting of Ti and amorphous carbon layers or a Ti–Zr–V compound film to fabricate surfaces with the maximum of the secondary electron yield being as low as 0.4. By structural and spectroscopic analysis of the formed surfaces it is demonstrated that both coatings enclose the nanostructures generated by redeposition of metal structures from the laser-induced plasma plume, keeping the initial topography intact. [...]
2022 - 8 p.
- Published in : Advanced Materials Interfaces 10 (2022) 2201671
Fulltext: PDF;
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9.
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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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10.
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Amorphous Carbon Coating in SPS
/ Vollenberg, Wil (CERN) ; Chiggiato, Paolo (CERN) ; Costa Pinto, Pedro (CERN) ; Cruikshank, Paul (CERN) ; Moreno, Harold (CERN) ; Pasquino, Chiara (CERN) ; Perez Espinos, Jaime (CERN) ; Taborelli, Mauro (CERN)
Within the LHC Injector Upgrade (LIU) project, the Super Proton Synchrotron (SPS) needs to be upgraded to inject into the LHC higher intensity and brighter 25-ns bunch spaced beams. To mitigate the Electron Multipacting (E.M.) phenomenon, a well-known limiting factor for high-intensity positively charged beams, CERN developed carbon coatings with a low Secondary Electron Yield (SEY). [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 3475-3478
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3475-3478
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