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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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2.
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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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3.
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Online luminosity control and steering at the LHC
/ Hostettler, Michael (CERN) ; Alemany-Fernández, Reyes (CERN) ; Calia, Andrea (CERN) ; Follin, Fabio (CERN) ; Fuchsberger, Kajetan (CERN) ; Gabriel, Mathieu (CERN) ; Gorzawski, Arkadiusz (CERN) ; Hemelsoet, Georges-Henry (CERN) ; Hruska, Marek (CERN) ; Jacquet, Delphine (CERN) et al.
This contribution reviews the novel LHC luminosity control software stack. All luminosity-related manipulations and scans in the LHC interaction points are managed by the LHC luminosity server, which enforces concurrency correctness and transactionality. [...]
2018 - 5 p.
- Published in : 10.18429/JACoW-ICALEPCS2017-TUSH201
Fulltext: PDF;
In : International Conference on Accelerator and Large Experimental Physics Control Systems, Barcelona, Spain, 8 - 13 Oct 2017, pp.TUSH201
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4.
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SAMbuCa: Sensors Acquisition and Motion Control Framework at CERN
/ Masi, Alessandro (CERN) ; Andreassen, Odd (CERN) ; Arruat, Michel (CERN) ; Danzeca, Salvatore (CERN) ; Di Castro, Mario (CERN) ; Donzé, Mathieu (CERN) ; Fargier, Sylvain (CERN) ; Ferraro, Rudy (CERN) ; Gulin, Marco (CERN) ; Kozsar, Ioan (CERN) et al.
Motion control systems at CERN often have challenging requirements, such as high precision in extremely radioactive environments with millisecond synchronization. These demanding specifications are particularly relevant for Beam Intercepting Devices (BIDs) such as the collimators of the Large Hadron Collider (LHC). [...]
2023 - 8 p.
- Published in : JACoW ICALEPCS 2023 (2023) TH2BCO04
Fulltext: PDF;
In : 19th International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS 2023), Cape Town, South Africa, 7 - 13 Oct 2023, pp.TH2BCO04
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5.
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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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6.
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Tensorics - A Java library for manipulating multi-dimensional data
/ Fuchsberger, Kajetan (CERN) ; Calia, Andrea (CERN) ; Garnier, Jean-Christophe (CERN) ; Gorzawski, Arkadiusz (CERN) ; Hostettler, Michael (CERN) ; Krol, Kamil (CERN)
Accelerator control software often has to handle multi-dimensional data of physical quantities when aggregating readings from multiple devices (e.g. the reading of an orbit in the LHC). [...]
2018 - 6 p.
- Published in : 10.18429/JACoW-ICALEPCS2017-THPHA177
Fulltext: PDF;
In : International Conference on Accelerator and Large Experimental Physics Control Systems, Barcelona, Spain, 8 - 13 Oct 2017, pp.THPHA177
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7.
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Operation of the LHC during the 2023 proton run
/ Calia, Andrea (CERN) ; Salvant, Benoit (CERN) ; Mirarchi, Daniele (CERN) ; Nisbet, David (CERN) ; Jacquet, Delphine (CERN) ; Métral, Elias (CERN) ; Bravin, Enrico (CERN) ; Trad, Georges (CERN) ; Wenninger, Jorg (CERN) ; Solfaroli, Matteo (CERN) et al.
In 2023 the LHC restarted after the yearly winter shutdown with a new machine configuration optimized for intensities of up to 1.8e+11 protons per bunch. In the first two months of the 2023 run the bunch intensities were pushed up to 1.6e+11 protons per bunch until a severe vacuum degradation, caused by a damaged RF bridge, occurred close to the ATLAS experiment. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) MOPC17
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPC17
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8.
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Operational $\beta$* levelling at the LHC in 2022 and beyond
/ Hostettler, M (CERN) ; Calia, A (CERN) ; Fartoukh, S (CERN) ; Jacquet, D (CERN) ; Wenninger, J (CERN)
During the third run period of the CERN Large Hadron Collider (LHC), as well as for the future High-Luminosity LHC era, luminosity levelling by beta* is a key technique to control the pile-up in the high-luminosity experiments ATLAS and CMS while maintaining Landau damping through the head-on beam-beam interaction. This implies changing the machine optics in the interaction regions while keeping high-intensity beams in collision and the experimental detectors in their data taking configuration. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL045
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL045
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9.
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Optics for Landau Damping with Minimized Octupolar Resonances in the LHC
/ Wenninger, J (CERN) ; Solfaroli, M (CERN) ; Nissinen, T (CERN) ; Hostettler, M (CERN) ; Horney, S (CERN) ; Chudoba, F (CERN) ; Tomás García, Rogelio (CERN) ; Carlier, Felix (CERN) ; Deniau, Laurent (CERN) ; Dilly, Joschua (CERN) et al.
Operation of the Large Hadron Collider (LHC) requires strong octupolar magnetic fields to suppress coherent beam instabilities. The amplitude detuning that is generated by these octupolar magnetic fields brings the tune of individual particles close to harmful resonances, which are mostly driven by the octupolar fields themselves. [...]
2024 - 4 p.
- Published in : JACoW HB 2023 (2024) 503-506
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.503-506
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10.
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Improvement of the LHC orbit feedback testing framework
/ Calia, Andrea (CERN) ; Alves, Diogo (CERN) ; Wenninger, Jorg (CERN) ; Hostettler, Michi (CERN) ; Jackson, Stephen (CERN)
During the Long Shutdown 2 (LS2 2019-2021) of the LHC, the orbit feedback correction software (OFB) of the LHC was redesigned to satisfy new requirements for LHC Run 3 (2022-2025) and to clean up legacy functionalities. The OFB is an essential component of LHC high intensity operation since the orbit must be stabilized to a fraction of the beam size during the entire LHC machine cycle. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) THPG30
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.THPG30
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