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2024-07-05
07:49
Deformation Behavior and Degradation on Rutherford Cabling of Nb$_{\text{3}}$Sn Wires / Hopkins, Simon C (CERN) ; Medina-Clavijo, Bentejui (CERN) ; Rastoll, Cristin (CERN ; U. Bourgogne) ; Rodia, Davide (CERN ; Geneva U.) ; Malabaila, Marina (CERN) ; Barth, Christian (CERN) ; Fleiter, Jerome (CERN) ; Boutboul, Thierry (CERN) ; Ballarino, Amalia (CERN)
In the production of Rutherford cables, Nb 3 Sn strands are subjected to severe deformation; and to evaluate this degradation prior to cabling, uniaxial rolling with a thickness reduction of ∼15% has often been used. The effects of this deformation on superconducting performance differ significantly between wire designs. [...]
2024 - 8 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 6001308 Fulltext: PDF;

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2024-07-03
14:47
Book cover The Large Hadron Collider and The Experiments for Run 3 : Special issue
IOP, 2024.


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2024-06-15
11:07
Beam gas curtain monitor: Vacuum studies for LHC integration and operation / Castro Sequeiro, C (CERN) ; Ady, M (CERN) ; Bregliozzi, G (CERN) ; Chatzigeorgiou, N (CERN) ; Churchman, A R (CERN) ; Kersevan, R (CERN) ; Lefevre, T (CERN) ; Mazzoni, S (CERN) ; Pigny, G (CERN) ; Rossi, A (CERN) et al.
A beam gas curtain (BGC) monitor has been designed to obtain information about the relative position between the LHC proton beam and the hollow electron lens electron beam through a minimally invasive process. Its working principle relies on intersecting the path of both beams with a supersonic gas curtain, introduced transversely into the LHC beamline, to produce a fluorescence signal. [...]
2024 - 10 p. - Published in : Phys. Rev. Accel. Beams 27 (2024) 043201 Fulltext: PDF;

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2024-06-11
06:40
Optics for Landau damping with minimized octupolar resonances in the LHC / Tomás, R (CERN) ; Carlier, F (CERN) ; Chudoba, F (CERN) ; Deniau, L (CERN) ; Dilly, J (CERN) ; Ferrentino, V (CERN ; Naples U.) ; Horney, S (CERN) ; Hostettler, M (CERN) ; Keintzel, J (CERN) ; Kostoglou, S (CERN) et al.
Operation of the Large Hadron Collider (LHC) requires strongoctupolar magnetic fields to suppress coherent beam instabilities.The amplitude detuning that is generated by these octupolar magneticfields brings the tune of individual particles close to harmfulresonances, which are mostly driven by the octupolar fieldsthemselves. In 2023, new optics were deployed in the LHC atinjection with optimized betatronic phase advances to minimize theresonances from the octupolar fields without affecting the amplitudedetuning. [...]
2024 - 14 p. - Published in : JINST 19 (2024) T05010 Fulltext: PDF;
In : 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.T05010

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2024-06-11
06:40
Transverse emittance growth due to rf noise in crab cavities: Theory, measurements, cure, and high luminosity LHC estimates / Baudrenghien, P (CERN) ; Mastoridis, T (Cal. Poly.)
The High-Luminosity LHC (HL-LHC) upgrade with planned operation from 2029 onward has a goal of achieving a tenfold increase in the integrated number of recorded collisions thanks to a doubling of the intensity per bunch (2.2×1011 protons) and a reduction of β* (the β value in the two high luminosity detectors, namely ATLAS and CMS) to 15 cm. Such an increase in recorded collisions would significantly expedite new discoveries and exploration. [...]
2024 - 20 p. - Published in : Phys. Rev. Accel. Beams 27 (2024) 051001 Fulltext: PDF;

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2024-06-07
06:37
LHC Upgrades in preparation of Run 3 / Arduini, G (CERN) ; Baglin, V (CERN) ; Bartosik, H (CERN) ; Bottura, L (CERN) ; Bracco, C (CERN) ; Bradu, B (CERN) ; Bregliozzi, G (CERN) ; Brodzinski, K (CERN) ; Bruce, R (CERN) ; Calviani, M (CERN) et al.
The Large Hadron Collider (LHC) Long Shutdown 2(2019–2021), following LHC Run 2, was primarily dedicated to theupgrade of the LHC Injectors but it included also a significantamount of activities aimed at consolidation of the LHC machinecomponents, removal of known limitations and initial upgrades inview of the High-Luminosity LHC (HL-LHC) to favour the intensityramp-up during Run 3 (2022–2025). An overview of the majormodifications to the accelerator and its systems is followed by asummary of the results of the superconducting magnet trainingcampaign to increase the LHC operation energy beyond the maximumvalue of 6.5 TeV reached during Run 2. [...]
2024 - 138 p. - Published in : JINST 19 (2024) P05061 Fulltext: PDF;
In : The Large Hadron Collider and The Experiments for Run 3, pp.P05061

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2024-06-07
06:37
Powering Tests Results of the First Batch of MCBXFB Magnets Produced in Industry / González, L (Madrid, CIEMAT) ; Domínguez, M (Madrid, CIEMAT) ; García-Matos, J A (Madrid, CIEMAT ; Comillas Pontifical U.) ; García-Tabarés, L (Madrid, CIEMAT) ; Martínez, T (Madrid, CIEMAT) ; Jardim, C Martins (Madrid, CIEMAT) ; Durán, Ó (Madrid, CIEMAT) ; Pérez, J M (Madrid, CIEMAT) ; Toral, F (Madrid, CIEMAT) ; Fiscarelli, L (CERN) et al.
MCBXF magnets are orbit nested correctors for the HL-LHC project, an upgrade of the Large Hadron Collider (LHC). The magnet design consists of two nested dipoles, with an aperture of 150 mm. [...]
2024 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4005505

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2024-05-21
12:34
Chamonix Workshop 2024 summary / Lamont, Mike (CERN) ; Jones, Rhodri (CERN)
The Chamonix Workshop 2024 took place from 29 January to 1 February 2024 at the “Majestic” conference centre in Chamonix. [...]
CERN-ACC-NOTE-2024-0010. - 2024. - 63 p.
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2024-05-21
12:21
LHC Performance Workshop 2022 summary / Lamont, Mike (CERN) ; Jones, Rhodri (CERN)
The LHC Performance Workshop took place from 24 to 27 January 2022 via video conference. [...]
CERN-ACC-NOTE-2024-0009. - 2024. - 56 p.
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2024-05-15
14:38
LHC MD 6944: RF Voltage Calibration / Karlsen-Baeck, Birk Emil (Sapienza Universita e INFN, Roma I (IT)) ; Argyropoulos, Theodoros (CERN) ; Calaga, Rama (CERN) ; Damerau, Heiko (CERN) ; Dlugosz, Dominika Agnieszka ; Karpov, Ivan (CERN) ; Timko, Helga (CERN)
This note summarizes the procedure and results from the MD on beam-based voltage calibration of the RF system. [...]
CERN-ACC-NOTE-2024-0008. - 2024. - 24 p.
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