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First results of running the LHC with lead ions at a beam energy of 6.8 Z TeV
/ Bruce, R (CERN) ; Fernandez, R Alemany (CERN) ; Argyropoulos, T (CERN) ; Bartosik, H (CERN) ; Bracco, C (CERN) ; D'Andrea, M (CERN) ; Frasca, A (CERN) ; Hermes, P (CERN) ; Jowett, J M (CERN) ; Mirarchi, D (CERN) et al.
A two-day test of operation with Pb ion beams was carried out in the CERN Large Hadron Collider (LHC) in 2022, with the aim of gaining experience in view of the future high luminosity heavy-ion physics runs from 2023 onwards. The LHC experiments received the first Pb-Pb collisions at a record energy of 5.36 TeV centre-of-mass energy per colliding nucleon pair (beam energy 6.8 Z TeV). [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL021
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL021
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2.
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Analysis of the performance in the 2023 LHC Pb-Pb run
/ Triantafyllou, Natalia (CERN) ; Bruce, Roderik (CERN) ; Redaelli, Stefano (CERN)
In 2023, the Pb-Pb run in the Large Hadron Collider (LHC) took place during the last five weeks of operation at a record beam energy of 6.8 Z TeV. It marked the first heavy-ion run of Run 3, following a two-day test that took place in 2022 to verify some key machine and beam upgrades. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) TUBD2
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.TUBD2
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3.
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LHC crystal collimation tests with 6.8 Z TeV Pb beams
/ Cai, R (CERN ; Ecole Polytechnique, Lausanne) ; Aberle, O (CERN) ; Bruce, R (CERN) ; Calviani, M (CERN) ; D'Andrea, M (CERN) ; Demassieux, Q (CERN) ; Dewhurst, K (CERN) ; Di Castro, M (CERN) ; Esposito, L S (CERN) ; Gilardoni, S (CERN) et al.
In the next heavy ion runs at the LHC, the cleaning of the beam halo will rely on crystal collimation. A test system installed in the collimation cleaning insertion is being upgraded for the operational challenges of the ion runs. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) TUPM120
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.TUPM120
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4.
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Crystal collimation performance at the LHC with a 6.8 TeV proton beam
/ D'Andrea, M (CERN) ; Aberle, O (CERN) ; Abramov, A (CERN) ; Bruce, R (CERN) ; Cai, R (CERN ; Ecole Polytechnique, Lausanne) ; Calviani, M (CERN) ; Demassieux, Q (CERN) ; Dewhurst, K A (CERN) ; Di Castro, M (CERN) ; Esposito, L S (CERN) et al.
Crystal collimation is studied to improve the collimation efficiency with ion beams at the High-Luminosity Large Hadron Collider (HL-LHC). Bent crystals are used instead of conventional primary collimators to deflect high-energy halo particles at angles orders of magnitude larger than what can be achieved with scattering by conventional materials. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL023
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL023
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5.
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Collimation quench test at the LHC with a 6.8 TeV proton beam
/ Hermes, P (CERN) ; Abramov, A (CERN) ; Bruce, R (CERN) ; Calzolari, D (CERN) ; D'Andrea, M (CERN) ; Esposito, L (CERN) ; Giovannozzi, M (CERN) ; Hernalsteens, C (CERN) ; Humann, B (CERN) ; Lechner, A (CERN) et al.
The High Luminosity upgrade of the CERN Large Hadron Collider (HL-LHC) aims to achieve stored beam energies of 680 MJ. One possible limit to the achievable intensity is the quench limit of the superconducting magnets downstream of the betatron collimation insertion. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPA123
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPA123
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6.
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Simulations and Measurements of Betatron and Off-momentum Cleaning Performance in the Energy Ramp at the LHC
/ Triantafyllou, Natalia (CERN) ; Bruce, Roderik (CERN) ; D'Andrea, Marco (CERN) ; Dewhurst, Kay (CERN) ; Lindström, Bjorn (CERN) ; Mirarchi, Daniele (CERN) ; Redaelli, Stefano (CERN) ; Van der Veken, Frederik (CERN)
The Large Hadron Collider (LHC) is equipped with a multistage collimation system that protects the machine against unavoidable beam losses at large betatron and energy offsets at all stages of operation. Dedicated validations and an understanding in simulations of the collimation performance are crucial for the energy ramp from 450 GeV to 6.8 TeV because complex changes of optics and orbit take place in this phase. [...]
2024 - 5 p.
- Published in : JACoW HB 2023 (2024) 279-283
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.279-283
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Operational handling of Crystal collimation at the LHC
/ Mirarchi, D (CERN) ; Andreassen, O (CERN) ; Bruce, R (CERN) ; Cai, R (CERN ; Ecole Polytechnique, Lausanne) ; Di Castro, M (CERN) ; D'Andrea, M (CERN) ; Hostettler, M (CERN) ; Jacquet, D (CERN) ; Masi, A (CERN) ; Matheson, E (CERN) et al.
A non-negligible risk of magnet quenches occurring due to the reduced cleaning performance of the original LHC collimation system with lead ion beams was expected at an energy of 6.8 Z TeV beams. Crystal collimation has therefore been integrated into the HL-LHC upgrade baseline to overcome present limitations. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL022
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL022
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The LHC run 2022
/ Jacquet, D (CERN) ; Argyropoulos, T (CERN) ; Bravin, E (CERN) ; Calia, A (CERN) ; Hostettler, M (CERN) ; Métral, E (CERN) ; Mirarchi, D (CERN) ; Nisbet, D (CERN) ; Persson, T (CERN) ; Redaelli, S (CERN) et al.
Following a 3-year long shutdown for upgrade and consolidation work, the LHC was re-commissioned in spring 2022, achieving a new record of 6.8 TeV per beam. This paper will describe the beam commissioning phase, the electron cloud conditioning, and the intensity ramp-up bringing the machine to a steady production state. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL020
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL020
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Collimation performance of the 400MJ LHC beam at 6.8 TeV
/ Van der Veken, Frederik (CERN) ; Abramov, Andrey (CERN) ; Azzopardi, Gabriella (CERN) ; Broggi, Giacomo (CERN) ; Bruce, Roderik (CERN) ; Cai, Rongrong (CERN) ; D'Andrea, Marco (CERN) ; Dewhurst, K A (CERN) ; Frasca, Alessandro (CERN) ; Hermes, Pascal (CERN) et al.
During the third operational run of the Large Hadron Collider at CERN, starting in 2022, the beam energy was increased to 6.8 TeV and the bunch population is planned to be pushed to unprecedented levels. Already in the first year of operation, beam stored energies up to 400 MJ were achieved. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) TUPM119
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.TUPM119
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10.
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Mitigating Collimation Impedance and Improving Halo Cleaning with New Optics and Settings Strategy of the HL-LHC Betatron Collimation System
/ Lindström, Bjorn (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; De Maria, Riccardo (CERN) ; Giacomel, Lorenzo (CERN) ; Hermes, Pascal (CERN) ; Mirarchi, Daniele (CERN) ; Mounet, Nicolas (CERN) ; Persson, Tobias (CERN) ; Redaelli, Stefano (CERN) et al.
With High Luminosity Large Hadron Collider (HL-LHC) beam intensities, there are concerns that the beam losses in the dispersion suppressors around the betatron cleaning insertion might exceed the quench limits. Furthermore, to maximize the beam lifetime it is important to reduce the impedance as much as possible. [...]
2024 - 5 p.
- Published in : JACoW HB 2023 (2024) 183-187
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.183-187
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