CERN Accelerating science

HL-LHC Conference Papers

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2024-01-20
08:08
Improved resistive plate chambers for HL-LHC upgrade of CMS / CMS Muon Collaboration
In view of the High Luminosity LHC, the CMS Muon system will be upgraded to sustain its efficient muon triggering and reconstruction performance. Resistive Plate Chambers (RPC) are dedicated detectors for muon triggering due to their excellent timing resolution. [...]
2024 - 6 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1060 (2024) 169075
In : 16th Workshop on Resistive Plate Chambers and Related Detectors (RPC 2022), CERN, Geneva, Switzerland, 26-30 Sep 2022, pp.169075

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2023-12-13
06:46
Potential and constraints of a beam-beam wire compensator in the HL-LHC era / Sterbini, G (CERN) ; Bertarelli, A (CERN) ; Papaphilippou, Y (CERN) ; Poyet, A (CERN) ; Rossi, A (CERN) ; Bélanger, P (TRIUMF)
The compensation of the long-range beam-beam interactions by DC wires is currently being investigated as an option for enhancing machine performance in the framework of the High-Luminosity LHC Project. In this paper, we report and comment on the potential of wire compensation during the first HL-LHC run. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) WEPL103 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPL103

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2023-12-13
06:46
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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2023-12-13
06:46
Beam-induced heating mitigation of the SPS kickers: a crucial upgrade to move towards HL-LHC beam intensities / Zannini, C (CERN) ; Barnes, M (CERN) ; Diaz, M (CERN) ; Ducimetière, L (CERN) ; Standen, D (CERN) ; Rumolo, G (CERN) ; Trubacova, P (CERN)
Beam-induced heating of equipment can have several undesirable effects, including rendering the equipment temporarily inoperative, equipment degradation and/or damage. Hence, to avoid these problems, it can be necessary to limit beam intensity. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) WEPL157 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPL157

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2023-12-13
06:46
Impact of Crab Cavity RF noise on the transverse beam profiles in the HL-LHC / Fornara, A (U. Manchester (main)) ; Appleby, R (U. Manchester (main)) ; Sterbini, G (CERN)
Crab Cavities (CCs) are a key component for the HL-LHC luminosity upgrade. To significantly reduce the Long-Range Beam-Beam (LRBB) effects a large crossing angle scheme is needed . [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) WEPL119 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPL119

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2023-12-13
06:46
Overview of material choices for HL-LHC collimators / Accettura, C (CERN) ; Biancacci, N (CERN) ; Bruce, R (CERN) ; Carra, F (CERN) ; Mounet, N (CERN) ; Kurtulus, A (CERN ; Zurich, ETH) ; Nuiry, F -X (CERN) ; Perillo Marcone, A (CERN) ; Redaelli, S (CERN)
In view of the High-Luminosity (HL-LHC) upgrade of the LHC collimation system, different materials were investigated to determine how the jaws of the new collimators could be manufactured to meet the demanding requirements of HL-LHC, such as thermomechanical robustness and stability, RF impedance, UHV, etc. During the Long-Shutdown 2 (LS2), five primary and 10 secondary low-impedance collimators were already produced using novel material. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) WEPA148 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPA148

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2023-12-13
06:46
Impedance analysis of deformable RF contact bridges for high luminosity LHC / Krkotic, P (CERN) ; Calatroni, S (CERN) ; Neroni, M (CERN) ; Völlinger, C (CERN) ; Salvant, B (CERN) ; Baglin, V (CERN) ; Garion, C (CERN) ; Bregliozzi, G (CERN)
In order to maintain the continuity of the vacuum system wall and comply with beam stability limits, radio frequency contact bridges are utilised as transitional elements in beam vacuum line interconnections. These radio frequency contact bridges must absorb and correct longitudinal, angular, and transverse misalignments brought on by mechanical motions during assembly, alignment, operating phases and thermal influences during accelerator operation. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) WEPL153 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPL153

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2023-12-13
06:46
Transverse beam coupling impedance studies at the CERN Proton Synchrotron Booster after the LHC Injectors Upgrade / Antuono, C (CERN ; Rome U.) ; Asvesta, F (CERN) ; Rumolo, G (CERN) ; Zannini, C (CERN) ; Migliorati, M (Rome U.)
After the LHC Injectors Upgrade (LIU) project, the CERN Proton Synchrotron Booster (PSB) operates with a new injection kinetic energy of 160 MeV and an extraction energy of 2 GeV. In light of this, several measurements have been performed to characterize the behaviour of the accelerator in terms of beam stability and beam coupling impedance in the new energy range. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) WEPL154 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPL154

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2023-12-13
06:46
Numerical calculation of the Lorentz force detuning and the pressure sensitivity for the HL-LHC crab cavity / Guillén-Hernández, T (CERN) ; Artoos, K (CERN) ; Calaga, R (CERN) ; Cano-Pleite, E (Carlos III U., Madrid) ; Capatina, O (CERN) ; Carra, F (CERN) ; Dassa, L (CERN) ; Turaj, K (CERN) ; Valverde-Alonso, N (CERN)
Crab cavities are fundamental components of the LHC upgrade in the framework of the HL-LHC project. These Radio Frequency cavities, operated at the appropriate frequency, ‘tilt’ the proton bunches to increase the luminosity at the collision points IP1 (ATLAS) and IP5 (CMS). [...]
2023 - 3 p. - Published in : JACoW IPAC 2023 (2023) WEPA149 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPA149

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2023-12-13
06:45
Magnetic-field measurements and preliminary modelling for the operation of the high-order corrector magnets for HL-LHC / Chmielinska, A (CERN) ; Fiscarelli, L (CERN) ; Russenschuck, S (CERN) ; Todesco, E (CERN) ; Statera, M (LASA, Segrate) ; De Matteis, E (LASA, Segrate) ; Prioli, M (LASA, Segrate)
High-order corrector magnets will be required for the magnetic system of the HL-LHC inner triplets. These magnets are based on a superferric design thus the saturation of the iron poles affects the field generated in the aperture, i.e., the magnetic transfer function shows a nonlinearity. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) WEPM057 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPM057

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