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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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Planar deposition of Nb thin films by HiPIMS for superconducting radiofrequency applications / Carlos, Carlota P A (CERN ; U. Geneva (main)) ; Leith, Stewart (CERN) ; Rosaz, Guillaume (CERN) ; Pfeiffer, Stephan (CERN) ; Senatore, Carmine (U. Geneva (main))
Cost efficiency and sustainability are critical challenges for future accelerator machines. Nb-coated Cu (Nb/Cu) superconducting radiofrequency (SRF) accelerating cavities, while requiring R&D; to meet high acceleration gradient performance standards, show potential for addressing these challenges. [...]
2024 - 12 p. - Published in : Vacuum 227 (2024) 113354 Fulltext: PDF;

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Optimizing the Manufacture of High-Purity Niobium SRF Cavities Using the Forming Limit Diagram: A Case Study of the HL-LHC Crab Cavities RFD Pole / Gallifa Terricabras, Adrià (CERN) ; Aviles Santillana, Ignacio (CERN) ; Barrière, Simon (CERN) ; Cano-Pleite, Eduardo (Carlos III U., Madrid) ; Garlasché, Marco (CERN) ; Narduzzi, Manuele (Fermilab) ; Pfeiffer, Stephan (CERN) ; Prever-Loiri, Laurent (CERN) ; Swieszek, Joanna (CERN ; U. Heidelberg (main))
The Crab Cavities are key components of the High Luminosity Large Hadron Collider (HL-LHC) project at CERN, which aims to increase the integrated luminosity of the LHC, the world’s largest particle accelerator, by a factor of ten. This paper explores the application of the Forming Limit Diagram (FLD) to enhance the manufacturing process of complex-shape Nb-based cavities, with a focus on the formability challenges experienced with the pole of the Radio Frequency Dipole (RFD) Crab Cavities. [...]
FERMILAB-CONF-23-769.- 2023 - 7 p. - Published in : JACoW SRF 2023 (2023) 627-633 Fulltext: PDF;
In : 21st International Conference on Radio-Frequency Superconductivity (SRF 2023), Grand Rapids, MI, United States, 22 - 30 Jun 2023, pp.627-633

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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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Towards Ultra-Thin Detector Magnet Designs by Insulating Coil Windings With V$_2$0$_3$-Epoxy Composite / Vaskuri, Anna (CERN) ; Curé, Benoit (CERN) ; Dudarev, Alexey (CERN) ; Mentink, Matthias (CERN) ; Pfeiffer, Stephan (CERN) ; Teissandier, Benoit (CERN)
We have measured temperature dependent resistivity of two types of vanadium oxide (V 2 O 3 ) epoxy composites from 77 K to room temperature. Such a composite could be used as an insulating layer between the windings of a superconducting magnet. [...]
2023 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 33 (2023) 1-4

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Out of focus ultrafast processing of metals for reduced secondary electron yield / Uren, Robin (U. Dundee) ; Din, A (U. Dundee) ; Wackerow, S (U. Dundee) ; Bez, E (CERN) ; Pfeiffer, S (CERN) ; Rimoldi, M (CERN) ; Himmerlich, M (CERN) ; Taborelli, M (CERN) ; Abdolvand, A (U. Dundee)
We have demonstrated out-of-focus ultrafast pulsed laser processing of copper with a variable working distance, without the need for mechanical movement. This was achieved by employing a diffractive optical element. [...]
2023 - 13 p. - Published in : Opt. Mater. Express 13 (2023) 1228 Fulltext: PDF;

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Beam-Impact Validation of HL-LHC Collimator Materials: the "MultiMat-2" Experiment / Carra, F (CERN) ; Accettura, C (CERN) ; Bertarelli, A (CERN) ; Berthomé, E (CERN) ; Bruce, R (CERN) ; Charitonidis, N (CERN) ; Dalemir, M (CERN) ; Farina, E (CERN) ; Guardia-Valenzuela, J (CERN) ; Guinchard, M (CERN) et al.
In 2017, a proton-impact test HL-LHC collimator materials was carried out in the HiRadMat facility at CERN. The experiment, called “MultiMat”, enabled the testing of bulk and coated materials developed at CERN for different beam collimation functionalities. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) WEPM109 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPM109

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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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Amorphous carbon thin films: Mechanisms of hydrogen incorporationduring magnetron sputtering and consequences for the secondary electronemission / Adame, C F ; Alves, E (Lisbon, IST) ; Barradas, N P (Lisbon, IST) ; Costa Pinto, P (CERN) ; Delaup, Y (CERN) ; Ferreira, I M M ; Neupert, H (CERN) ; Himmerlich, M (CERN) ; Pfeiffer, S (CERN) ; Rimoldi, M (CERN) et al.
Amorphous carbon (a-C) films, having low secondary electron yield (SEY), are usedat CERN to suppress electron multipacting in the beam pipes of particleaccelerators. It was already demonstrated that hydrogen impurities increase theSEY of a-C films. [...]
2023 - 14 p. - Published in : J. Vac. Sci. Technol. A 41 (2023) 043412 Fulltext: PDF;

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10.

Dielectric resonator to measure surface resistance of accelerator components at room temperature and 77 K / Brunner, Kristóf (CERN) ; Krkotić, Patrick (CERN) ; Pinto, Pedro Costa (CERN) ; Diaz-Rato, Eduardo Gibbons (CERN) ; Pfeiffer, Stephan (CERN) ; Vollenberg, Wilhelmus (CERN) ; Calatroni, Sergio (CERN) ; Barna, Dániel (Wigner RCP, Budapest) ; Pont, Montse (CELLS - ALBA, LLS) ; O'Callaghan, Joan (Barcelona, Polytechnic U.)
We measured the surface resistance of titanium, amorphous carbon, and nonevaporable getter (NEG) coatings on copper samples, representative of surface treatments of beam-facing components in the High-Luminosity Large Hadron Collider at CERN. Measurements were done at room temperature as well as at liquid nitrogen temperature (77 K) by means of a novel large dielectric resonator operating at 3.4 GHz. [...]
2023 - 8 p. - Published in : Phys. Rev. Accel. Beams 26 (2023) 083101 Fulltext: PDF;

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See also: similar author names
1	Pfeiffer, S.
2	Pfeiffer, Silvia
9	Pfeiffer, Stephan
1	Pfeiffer, Sven

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