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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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2.
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LHC Beam Collimation During Extended $\beta$*-Levelling in Run 3
/ Van der Veken, Frederik (CERN) ; Bruce, Roderik (CERN) ; Hostettler, Michael (CERN) ; Mirarchi, Daniele (CERN) ; Redaelli, Stefano (CERN)
During the third operational Run of the Large Hadron Collider at CERN, starting in 2022, the bunch population will be increased to unprecedented levels requiring to deploy $\beta$*-levelling of the luminosity over a wide range of values to cope with the limitations imposed by event pile-up at the experiments and heat load on the triplets induced by collision debris. During this levelling, both beam optics and orbit change in various areas of the ring, in particular around the high-luminosity experiments, where several collimators are installed. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 2138-2141
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.2138-2141
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3.
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Mitigation of losses at injection protection devices in the CERN LHC
/ Tomás, R (CERN) ; Calia, A (CERN) ; D'Andrea, M (CERN) ; Deniau, L (CERN) ; Jacquet, D (CERN) ; Kostoglou, S (CERN) ; Maclean, E H (CERN) ; Mirarchi, D (CERN) ; Paraschou, K (CERN) ; Persson, T (CERN) et al.
During loss maps performed with beam at injection energy in the LHC with the high octupole and chromaticity settings used for multi-train operation, large beam losses were observed at an injection protection device (TDIS). Although these losses did not present a threat to machine operation or protection, reducing them is of high importance to improve machine performance. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL019
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL019
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4.
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Collimation of 400 MJ Beams at the LHC: The First Step Towards the HL-LHC Era
/ Redaelli, Stefano (CERN) ; Abramov, Andrey (CERN) ; Baillard, Dylan (CERN) ; Bruce, Roderik (CERN) ; Cai, Rongrong (CERN ; Ecole Polytechnique, Lausanne) ; Carra, Federico (CERN) ; D'Andrea, Marco (CERN) ; Di Castro, Mario (CERN) ; Giacomel, Lorenzo (CERN) ; Hermes, Pascal (CERN) et al.
An important upgrade programme is planned for the collimation system of the CERN Large Hadron Collider (LHC) in order to meet the challenges of the upcoming High-Luminosity LHC (HL-LHC) project. A first stage of the HL-LHC upgrade was already deployed during the last LHC Long Shutdown, offering important improvements of the collimation cleaning, a significant reduction of the impedance contribution and better cleaning of collisional debris, in particular for ion-ion collisions. [...]
2024 - 4 p.
- Published in : JACoW HB 2023 (2024) 603-606
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.603-606
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5.
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Simulations and measurements of collisional losses with Pb beams at the LHC
/ Frasca, A (CERN) ; Abramov, A (CERN) ; Bruce, R (CERN) ; Cai, R (CERN) ; Cerutti, F (CERN) ; Esposito, L (CERN) ; Lindström, B (CERN) ; Van der Veken, F (CERN) ; Ziliotto, F (CERN) ; Patecki, M (CERN)
During about one month in every operational year, the Large Hadron Collider (LHC) works as a heavy-ion collider. Four one-month Pb-Pb runs have been executed so far, as well as two p-Pb runs. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL029
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL029
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7.
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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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8.
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Investigations of losses on the CERN SPS flat bottom with HL-LHC type beams
/ Lasheen, Alexandre (CERN) ; Bartosik, Hannes (CERN) ; Damerau, Heiko (CERN) ; Demetriadou, Despina (CERN) ; Vinten, Evin (CERN) ; Hermes, Pascal (CERN) ; Kain, Verena (CERN) ; Karpov, Ivan (CERN) ; Papotti, Giulia (CERN) ; Vadai, Mihaly (CERN) et al.
The High-Luminosity LHC (HL-LHC) project at CERN aims at doubling the beam intensity and the brightness. To achieve this unprecedented performance, the LHC injectors were upgraded during the Long Shutdown 2 (2019-2021) to overcome limitations such as space charge and beam instabilities. [...]
2023
- Published in : JACoW IPAC 2023 (2023) TUPA153
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.TUPA153
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9.
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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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10.
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LHC Collimation Controls System for Run III Operation
/ Azzopardi, Gabriella (CERN) ; Di Castro, Mario (CERN) ; Redaelli, Stefano (CERN) ; Salvachua, Belen (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Valentino, Gianluca (U. Malta)
The Large Hadron Collider (LHC) collimation system is designed to protect the machine against unavoidable beam losses. The collimation system for the LHC Run 3, starting in 2022, consists of more than 100 movable collimators located along the 27 km long ring and in the transfer lines. [...]
2022 - 6 p.
- Published in : JACoW ICALEPCS2021 (2022) 888-893
Fulltext: PDF;
In : 18th International Conference on Accelerator and Large Experimental Physics Control Systems, Online, 18 - 22 Oct 2021, pp.888-893
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