CERN Accelerating science

HL-LHC Papers

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2024-08-06
07:33
Chapter 31: High Field Accelerator Magnets for Next Generation Colliders – Motivation, Goals, Challenges and R&D; Drivers / Bottura, L (CERN)
The Hadron Collider (LHC) at CERN can be regarded as the ultimate collider built with Nb3 Ti magnets. Its main dipoles have reached a field of approximately 8 T, which is very likely close to the highest practical field for this superconductor in accelerators. [...]
2024 - 27 p. - Published in : Adv. Ser. Direct. High Energy Phys. 31 (2024) 615-641 Fulltext: PDF;
In : The High Luminosity Large Hadron Collider, pp.615-641

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2024-08-06
07:33
Chapter 22: Integration, (De-) Installation and Alignment / Fessia, P (CERN) ; Durand, H Mainaud (CERN)
Optimized space allocation for each equipment is instrumental to ensure that the various systems perform according to specification and to minimize installation and maintenance time. The general optimization effort goes under the name of “integration”, and it is strictly linked to the de-installation of the previous machine, to the management of the interfaces with existing infrastructures and to the installation of the new HL-LHC equipment. [...]
2024 - 25 p. - Published in : Adv. Ser. Direct. High Energy Phys. 31 (2024) 475-499 Fulltext: PDF;
In : The High Luminosity Large Hadron Collider, pp.475-499

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2024-08-06
07:33
Chapter 24: HL-LHC IT String and Hardware Commissioning / Bajko, M (CERN) ; Pojer, M (CERN)
The HL-LHC IT String is the test stand to validate the collective behavior of the Inner Triplet (IT) magnets and circuits in conditions as near as possible to the operational ones..
2024 - 17 p. - Published in : Adv. Ser. Direct. High Energy Phys. 31 (2024) 519-535 Fulltext: PDF;
In : The High Luminosity Large Hadron Collider, pp.519-535

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2024-08-06
07:33
Chapter 5: Machine Physics and Performance / Arduini, G (CERN) ; De Maria, R (CERN) ; Giovannozzi, M (CERN) ; Iadarola, G (CERN) ; Métral, E (CERN) ; Papaphilippou, Y (CERN) ; Tomás, R (CERN)
The main beam and machine parameter choices and the underlying beam dynamics considerations are reviewed together with the main challenges and expected performance..
2024 - 44 p. - Published in : Adv. Ser. Direct. High Energy Phys. 31 (2024) 121-164 Fulltext: PDF;
In : The High Luminosity Large Hadron Collider, pp.121-164

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2024-08-06
07:33
Chapter 25: SRF Cryogenic Test Facility for the HL-LHC / Tavian, L (CERN) ; Vandoni, G (CERN) ; Delsolaro, W Venturini (CERN)
Several test stands were assembled for testing integrated operation of individual components with and without beam. Amongst these, at CERN, the SPS SRF test stands allows to qualify crab cavity modules with beam, while the test facilities situated in the SM18 buildings underwent important upgrades for testing SRF single-crab-cavities, SRF modules, superconducting cryomagnets and cold powering systems. [...]
2024 - 6 p. - Published in : Adv. Ser. Direct. High Energy Phys. 31 (2024) 537-542 Fulltext: PDF;
In : The High Luminosity Large Hadron Collider, pp.537-542

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2024-08-06
07:33
Chapter 23: The HL-LHC Technical Infrastructure / Tavian, L (CERN)
The upgrade in luminosity of the LHC requires large and new technical infrastructures like civil engineering, electrical distribution, cooling, ventilation, access system, alarm system, transport, and operational safety system. This chapter describes the new technical infrastructure including layout, performance requirements and architecture as well as the main technical challenges..
2024 - 17 p. - Published in : Adv. Ser. Direct. High Energy Phys. 31 (2024) 501-517 Fulltext: PDF;
In : The High Luminosity Large Hadron Collider, pp.501-517

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2024-08-06
07:33
Chapter 21: Beam from Injectors: The LHC Injectors Upgrade (LIU) Project / Meddahi, M (CERN) ; Rumolo, G (CERN) ; Alemany, R (CERN) ; Bartosik, H (CERN) ; Bellodi, G (CERN) ; Coupard, J (CERN) ; Damerau, H (CERN) ; Di Giovanni, G P (CERN) ; Funken, A (CERN) ; Garoby, R et al.
The LHC Injectors Upgrade (LIU) project aims at increasing the intensity and brightness in the LHC injectors in order to match the challenging requirements of the High-Luminosity LHC (HL-LHC) project, while ensuring high availability and reliable operation of the injectors complex up to the end of the HL-LHC era. Fulfilling this goal requires extensive hardware modifications and new beam dynamics solutions across the entire LHC proton and ion injection chains: the new Linac4, the Proton Synchrotron Booster (PSB), the Proton Synchrotron (PS), the Super Proton Synchrotron (SPS), together with Linac3 and the Low Energy Ion Ring (LEIR) as ion PS injectors. [...]
2024 - 17 p. - Published in : Adv. Ser. Direct. High Energy Phys. 31 (2024) 457-473 Fulltext: PDF;
In : The High Luminosity Large Hadron Collider, pp.457-473

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2024-08-06
07:33
Chapter 29: The Role of Noise on Beam Stability and Performance in HL-LHC / Buffat, X (CERN) ; Furuseth, S V (CERN ; Ecole Polytechnique, Lausanne ; IPT, Lausanne) ; Métral, E (CERN) ; Pieloni, T (Ecole Polytechnique, Lausanne ; IPT, Lausanne) ; Tambasco, C (Ecole Polytechnique, Lausanne ; IPT, Lausanne) ; Valuch, D (CERN)
The beam response to an external excitation may result in a growth of the emittance, or more generally a modification of its particle distribution. The former reduces the luminosity, and the latter might lead to a loss of Landau damping of coherent instabilities. [...]
2024 - 9 p. - Published in : Adv. Ser. Direct. High Energy Phys. 31 (2024) 593-601 Fulltext: PDF;
In : The High Luminosity Large Hadron Collider, pp.593-601

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2024-08-06
07:33
Chapter 30: Crystal Collimation of Heavy-Ion Beams / Redaelli, S (CERN) ; Bruce, R (CERN) ; D’Andrea, M (CERN) ; Mirarchi, D (CERN) ; Rossi, R (CERN)
Crystal collimation is an advanced technique where a silicon crystal, only a few millimeters long and bent to a curvature of about 50 μrad, coherently deflects the beam halo onto a collimator absorber. This technique can improve beam collimation in the HL-LHC. [...]
2024 - 11 p. - Published in : Adv. Ser. Direct. High Energy Phys. 31 (2024) 603-613 Fulltext: PDF;
In : The High Luminosity Large Hadron Collider, pp.603-613

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2024-08-06
07:33
Chapter 26: The International Network of Test Infrastructures for the HL-LHC Magnets and Cold Powering System / Bajko, M (CERN)
This chapter describes the test facilities upgraded in the framework of HL-LHC for testing magnets, cryo assemblies, SC Link systems, HTS leads and cold diodes at CERN, and at the collaborators’ premises..
2024 - 18 p. - Published in : Adv. Ser. Direct. High Energy Phys. 31 (2024) 543-560 Fulltext: PDF;
In : The High Luminosity Large Hadron Collider, pp.543-560

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