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CERN Document Server 18 record trovati  1 - 10successivo  salta al record: La ricerca ha impiegato 0.55 secondi. 
1.
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.
Overview of beam intensity issues and mitigations in the CERN-SPS fast wire scanners / Veness, Raymond (CERN) ; Guerrero, Ana (CERN) ; Perez Fontenla, Ana Teresa (CERN) ; Harrison, Anthony (CERN) ; Salvant, Benoit (CERN) ; Zannini, Carlo (CERN) ; Antuono, Chiara (CERN) ; Vollinger, Christine (CERN) ; de la Fuente, Elena (CERN) ; Carra, Federico (CERN) et al.
A new design of fast wire scanner was installed in the CERN injector complex as part of the upgrades linked to the High-Luminosity LHC Project. Initial operations with these beams were good, but during the planned intensity ramp-up one early 2023, all four SPS scanners failed at the same time. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) WEPG26 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEPG26
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3.
Development and characterisation of advanced coatings for high energy physics applications / Perez Fontenla, Ana Teresa (CERN) ; Pereira Carlos, Carlota (CERN) ; Leith, Stewart (CERN) ; Moros, Alice (CERN) ; Pfeiffer, Stephan (CERN) ; Rodriguez-Castro, Enrique (CERN) ; Rosaz, Guillaume (CERN)
The Future Circular Collider (FCC) study develops the technologies for next generation high performance particle colliders and accelerating structures. It places high requirements on the performance of Superconducting Radio Frequency (SRF) cavities used to accelerate the particle beam. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) WEPA150 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPA150
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4.
Analysis of the Leakage Events in the Thermal Shield Cooling Pipes of the ITER Magnet System / Sgobba, Stefano (CERN) ; Santillana, Ignacio Aviles (CERN) ; Celuch, Michal (CERN) ; Crouvizier, Mickaël (CERN) ; Perez Fontenla, Ana Teresa (CERN) ; Castro, Enrique Rodriguez (CERN) ; Mitchell, Neil (Euratom, St. Paul Lez Durance) ; Koizumi, Norikiyo (Euratom, St. Paul Lez Durance) ; Pearce, Robert (Euratom, St. Paul Lez Durance) ; Worth, Liam (Euratom, St. Paul Lez Durance) et al.
The ITER Thermal Shields (TS) consist of actively cooled stainless steel panels. Their role is to minimise the radiation heat load from warm components, such as the Vacuum Vessel (VV) and the cryostat, hence contributing to insulating the magnet system operating at 4.5 K. [...]
2024 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4203405
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5.
RF characterisation of laser treated copper surfaces for the mitigation of electron cloud in accelerators / Krkotic, Patrick (CERN) ; Calatroni, Sergio (CERN) ; Abdolvand, Amin (Dundee U.) ; Perez Fontenla, Ana Teresa (CERN) ; Neupert, Holger (CERN) ; Himmerlich, Marcel (CERN) ; Wackerow, Stefan (Dundee U.)
In accelerator beam chambers and RF waveguides, electron cloud and multipacting can be mitigated effectively by reducing the secondary electron yield (SEY). In recent years, it has been established that laser surface structuring is a very efficient method to create a copper surface with SEY close to or even below unity. [...]
2023 - 4 p. - Published in : JACoW IPAC2023 (2023) THPA137 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPA137
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6.
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Materials and their production processing for ET's beampipes / Perez Fontenla, Ana Teresa (speaker) (CERN)
2023 - 1585. Workshops; Beampipes for Gravitational Wave Telescopes 2023 External links: Talk details; Event details In : Beampipes for Gravitational Wave Telescopes 2023
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7.
Punching of arbitrary face prismatic loops from hydrogen nanobubbles in copper / Lopez-Cazalilla, A (Helsinki U.) ; Djurabekova, F (Helsinki U.) ; Granberg, F (Helsinki U.) ; Mizohata, Kenichiro (Helsinki U.) ; Perez-Fontenla, Ana Teresa (CERN) ; Calatroni, Sergio (CERN) ; Wuensch, Walter (CERN)
When a metal surface is exposed to prolonged irradiation with energetic H−, the ions are expected to penetrate into bulk and dissolve in the matrix. However, the irradiated surfaces exhibit dramatic morphological changes in the form of “blisters” covering the surface exposed to irradiation. [...]
2022 - 12 p. - Published in : Acta Mater. 225 (2022) 117554 Fulltext: PDF;
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8.
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.
Pulsed DC High Field Measurements of Irradiated and Non-Irradiated Electrodes of Different Materials / Peacock, Ruth (Lancaster U. (main) ; CERN) ; Bellodi, Giulia (CERN) ; Burt, Graeme (Lancaster U. (main)) ; Calatroni, Sergio (CERN) ; Da Palma Serafim, Catarina (CERN) ; Grudiev, Alexej (CERN) ; Lombardi, Alessandra (CERN) ; Perez Fontenla, Ana Teresa (CERN) ; Ramberger, Suitbert (CERN) ; Sargsyan, Edgar (CERN) et al.
Beam loss occurs in Radio Frequency Quadrupoles (RFQ), and has been observed in the H⁻ linear accelerator Linac4 (L4) at CERN. To determine if beam loss can induce breakdowns, and to compare the robustness of different materials, tests have been done using pulsed high-voltage DC systems. [...]
2022 - 4 p. - Published in : JACoW LINAC 2022 (2022) 441-444 Fulltext: PDF;
In : 31st Linear Accelerator Conference (LINAC22), Liverpool, UK, 28 Aug - 2 Sep 2022, pp.441-444
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10.
Microscopy Investigation on Different Materials After Pulsed High Field Conditioning and Low Energy H$^{-}$ Irradiation / Da Palma Serafim, Catarina (CERN ; U. Helsinki (main)) ; Bellodi, Giulia (CERN) ; Calatroni, Sergio (CERN) ; Djurabekova, Flyura (U. Helsinki (main)) ; Grudiev, Alexej (CERN) ; Lombardi, Alessandra (CERN) ; Peacock, Ruth (CERN) ; Perez Fontenla, Ana Teresa (CERN) ; Ramberger, Suitbert (CERN) ; Sargsyan, Edgar (CERN) et al.
During operation the RFQ (Radio-Frequency-Quadrupole) of the LINAC4 at CERN is exposed to high electric fields which can lead to vacuum breakdown. It is also subject to beam loss that can cause surface modification, including blistering, which can result in reduced electric field handling and an increased breakdown rate. [...]
2022 - 4 p. - Published in : JACoW LINAC 2022 (2022) 422-425 Fulltext: PDF;
In : 31st Linear Accelerator Conference (LINAC22), Liverpool, UK, 28 Aug - 2 Sep 2022, pp.422-425
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