CERN Accelerating science

HL-LHC Conference Papers

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2023-01-14
06:09
RF Dipole Crab Cavity Testing for HL-LHC / Valverde Alonso, Nuria (CERN) ; Calaga, Rama (CERN) ; Calvo, Sebastien (CERN) ; Capatina, Ofelia (CERN) ; Castilla, Alejandro (CERN ; Lancaster U. (main)) ; Chiodini, Marco (CERN) ; Duval, Christophe (CERN) ; Ferreira, Leonel (CERN) ; Gourragne, Max (CERN) ; Kohler, Paul (CERN) et al.
RF Crab Cavities are an essential element of the High Luminosity LHC (HL-LHC) upgrade at CERN. Two RF dipole crab cavity used for the compensation of the horizontal crossing angle were recently manufactured and integrated into Titanium Helium tank and RF ancillaries necessary for the beam operation. [...]
2022 - 7 p. - Published in : JACoW SRF 2021 (2022) 687-693 Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.687-693

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2023-01-11
06:09
First Interaction Region Local Coupling Corrections in the LHC Run 3 / Soubelet, Felix (CERN ; Liverpool U.) ; Apsimon, Oznur (Liverpool U.) ; Persson, Tobias (CERN) ; Tomás García, Rogelio (CERN) ; Welsch, Carsten (Liverpool U.)
The successful operation of large scale particle accelerators depends on the precise correction of unavoidable magnetic field or magnet alignment errors present in the machine. During the LHC Run 2, local linear coupling in the interaction regions (IR) was shown to have a significant impact on the beam size, making its proper handling a necessity for Run 3 and the High Luminosity LHC (HL-LHC). [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 1838-1841 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1838-1841

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2023-01-11
06:09
Suppression of Crab Cavity Noise Induced Emittance Growth by Transverse Beam Coupling Impedance / Triantafyllou, Natalia (Liverpool U. ; CERN) ; Antoniou, Fanouria (CERN) ; Bartosik, Hannes (CERN) ; Baudrenghien, Philippe (CERN) ; Buffat, Xavier (CERN) ; Calaga, Rama (CERN) ; Mastoridis, Themis (Cal. Poly.) ; Papaphilippou, Yannis (CERN) ; Wolski, Andrzej (Liverpool U.)
Crab cavities are a key component of the High Luminosity LHC (HL-LHC) upgrade, as they aim to mitigate the luminosity reduction induced by the crossing angle. Two superconducting crab cavities (CCs) were installed in the Super Proton Synchrotron (SPS) at CERN in 2018 to demonstrate their operation in a proton machine for the first time. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 1659-1662 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1659-1662

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2023-01-11
06:09
Impact of Broadband Impedance on Longitudinal Coupled-Bunch Instability Threshold / Karpov, Ivan (CERN) ; Shaposhnikova, Elena (CERN)
Coupled-bunch instabilities (CBI) and the loss of Landau damping (LLD) in the longitudinal plane can affect the performance of high-current synchrotrons. The former is driven by the narrowband impedance of resonant structures, while the latter is mainly determined by the broadband impedance of the entire accelerator and is a single-bunch effect. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 2245-2248 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.2245-2248

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2023-01-11
06:09
Thermo-Mechanical Modeling and Thermal Performance Analysis of Beam Vacuum Line Interconnections and Cold Warm Transitions in HL-LHC Long Straight Section Magnets / Harray, Jérôme (CERN) ; Garion, Cedric (CERN) ; Petit, Valentine (CERN)
The HL-LHC upgrade, aiming at increasing the LHC levelled luminosity by factor of five, relies on new superconducting magnets requiring a new beam vacuum system. Along with the challenges related to magnet design, the beam optic configuration exposes this new equipment to stringent conditions for vacuum and cryogenic performance. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 2839-2842 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.2839-2842

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2023-01-11
06:09
Mitigation of High Voltage Breakdown of the Beam Screen of a CERN SPS Injection Kicker Magnet / Barnes, Michael (CERN) ; Bartmann, Wolfgang (CERN) ; Díaz Zumel, Miguel (CERN) ; Ducimetière, Laurent (CERN) ; Feliciano, Luis (CERN) ; Kramer, Thomas (CERN) ; Namora, Vasco (CERN) ; Stadlbauer, Tobias (CERN) ; Standen, Dylan (CERN) ; Trubacova, Pavlina (CERN) et al.
The SPS injection kicker magnets (MKP) were developed in the 1970’s, before beam induced power deposition was considered an issue. These magnets are very lossy from a beam impedance perspective: this is expected to be an issue during SPS operation with the higher intensity beams needed for HL-LHC. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 2868-2871 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.2868-2871

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2023-01-11
06:09
Simulation Studies of Longitudinal Stability for High-Intensity LHC-Type Beams in the CERN SPS / Quartullo, Danilo (CERN) ; Intelisano, Leandro (CERN) ; Karpov, Ivan (CERN) ; Papotti, Giulia (CERN)
Beams in the SPS for the High Luminosity LHC (HL-LHC) must be stabilized in the longitudinal plane up to an intensity of 2.4·10¹¹ protons per bunch. The fourth harmonic RF system increases Landau damping, and controlled longitudinal emittance blow-up is applied to cope with coupled-bunch instabilities along the ramp and at flat-top. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 2249-2252 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.2249-2252

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2023-01-11
06:09
A Novel Tool for Beam Dynamics Studies with Hollow Electron Lenses / Hermes, Pascal (CERN) ; Bruce, Roderik (CERN) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Iadarola, Giovanni (CERN) ; Mirarchi, Daniele (CERN) ; Redaelli, Stefano (CERN)
Hollow Electron Lenses (HELs) are crucial components of the CERN LHC High Luminosity Upgrade (HL-LHC), serving the purpose of actively controlling the population of the transverse beam halo to reduce particle losses on the collimation system. Symplectic particle tracking simulations are required to optimize the efficiency and study potentially undesired beam dynamics effects with the HELs. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 176-179 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.176-179

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2023-01-11
06:09
Implications and Mitigation of Radiation Effects on the CERN SPS Operation during 2021 / Aguiar, Ygor (CERN) ; Apollonio, Andrea (CERN) ; Biłko, Kacper (CERN) ; Brucoli, Matteo (CERN) ; Cecchetto, Matteo (CERN) ; Danzeca, Salvatore (CERN) ; García Alía, Ruben (CERN) ; Ladzinski, Tomasz (CERN) ; Lerner, Giuseppe (CERN) ; Potoine, Jean-Baptiste (CERN) et al.
During the Long Shutdown 2 (LS2, 2019-2020), the CERN accelerator complex has undergone major upgrades, mainly in preparation for the High-Luminosity (HL) LHC era, the ultimate capacity for its physics production. Therefore, several novel equipment and systems were designed and deployed throughout the accelerator complex. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 740-743 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.740-743

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2023-01-11
06:08
HL-LHC Crab Cavity HOM Couplers: Challenges and Results / Mitchell, James (CERN) ; Calaga, Rama (CERN) ; Montesinos, Eric (CERN)
To compensate for the detrimental effect of the crossing angle on luminosity production in the High Luminosity Large Hadron Collider’s (HL-LHC) interaction regions, superconducting crab cavities (vertical and horizontal) will be installed at the two interaction regions of the ATLAS and CMS experiments. Both cavity designs use multiple Higher Order Mode (HOM) couplers to reduce beam instabilities and heat loads caused by the very high proton current in the HL-LHC. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) TUPOTK064 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.TUPOTK064

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