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Optics for Landau damping with minimized octupolar resonances in the LHC
/ Tomás, R (CERN) ; Carlier, F (CERN) ; Chudoba, F (CERN) ; Deniau, L (CERN) ; Dilly, J (CERN) ; Ferrentino, V (CERN ; Naples U.) ; Horney, S (CERN) ; Hostettler, M (CERN) ; Keintzel, J (CERN) ; Kostoglou, S (CERN) et al.
Operation of the Large Hadron Collider (LHC) requires strongoctupolar magnetic fields to suppress coherent beam instabilities.The amplitude detuning that is generated by these octupolar magneticfields brings the tune of individual particles close to harmfulresonances, which are mostly driven by the octupolar fieldsthemselves. In 2023, new optics were deployed in the LHC atinjection with optimized betatronic phase advances to minimize theresonances from the octupolar fields without affecting the amplitudedetuning. [...]
2024 - 14 p.
- Published in : JINST 19 (2024) T05010
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.T05010
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First operational dodecapole correction in the LHC
/ Dilly, J (CERN ; Humboldt U., Berlin (main)) ; Ferrentino, V (CERN ; Naples U.) ; Le Garrec, M (CERN ; Goethe U., Frankfurt (main)) ; Maclean, E H (CERN) ; Malina, L (DESY) ; Persson, T (CERN) ; Pugnat, T (CERN) ; van Riesen-Haupt, L (LPHE, Lausanne) ; Soubelet, F (CERN ; U. Liverpool (main)) ; Tomás, R (CERN)
Amplitude detuning measurements in the LHC have shown that a significant amount of detuning is generated via feed-down from high-order field errors in the magnets of the experiment insertion regions. This undesired effect can be detrimental to the luminosity production of the machine and is expected to be enhanced in the upcoming high-luminosity upgrade of the collider, the HL-LHC. [...]
2023 - 22 p.
- Published in : Phys. Rev. Accel. Beams 26 (2023) 121001
Fulltext: PDF;
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High intensity beam dynamics assessment and challenges for HL-LHC
/ Rumolo, G (CERN) ; Salvant, B (CERN) ; Mounet, N (CERN) ; Tomás, R (CERN) ; Bartosik, H (CERN) ; Baudrenghien, P (CERN) ; Bruce, R (CERN) ; Buffat, X (CERN) ; Calaga, R (CERN) ; De Maria, R (CERN) et al.
The High Luminosity (HL-LHC) project aims to increase the integrated luminosity of CERN’s Large Hadron Collider (LHC) by an order of magnitude compared to its initial design. This requires a large increase in bunch intensity and beam brightness compared to the first LHC runs, and hence poses serious collective-effects challenges, related in particular to electron cloud, instabilities from beam-coupling impedance, and beam-beam effects. [...]
2024 - 7 p.
- Published in : JINST
- Published in : JACoW HB: 2023 (2024) , pp. 344-350
Fulltext: PublicationJACoW - PDF; PublicationIOP - 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.T05016
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Analysis on bunch-by-bunch beam losses at 6.5 TeV in the Large Hadron Collider
/ Paraschou, Konstantinos (CERN ; Aristotle U., Thessaloniki) ; Iadarola, Giovanni (CERN) ; Karastathis, Nikolaos (CERN) ; Kostoglou, Sofia (Natl. Tech. U., Athens ; CERN) ; Papaphilippou, Yannis (CERN) ; Sabato, Luca (CERN)
In 2018, a large fraction of the physics data taking at the Large Hadron Collider has been performed with a beam energy of 6.5 TeV, the nominal bunch spacing of 25 ns and beta functions at the high luminosity interaction points of 30 cm. In order to maximize the integrated luminosity, the crossing angles are gradually reduced as the beam intensity reduces due to luminosity burn-off. [...]
CERN-ACC-2019-068.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-MOPMP029
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPMP029
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Experimental Tests of a Full Analog Fiber Optic Monitoring System Suitable for Safety Application at CERN
/ Marrazzo, Vincenzo Romano (U. Naples (main) ; CERN) ; Fienga, Francesco (U. Naples (main) ; CERN) ; Sito, Leonardo (U. Naples (main) ; CERN) ; Beni, Noemi (CERN ; KLTE-ATOMKI) ; Szillasi, Zoltan (CERN ; KLTE-ATOMKI) ; Riccio, Michele (U. Naples (main)) ; Buontempo, Salvatore (CERN ; INFN, Naples) ; Irace, Andrea (U. Naples (main)) ; Breglio, Giovanni (U. Naples (main) ; CERN)
In this work, experimental tests of a full analog fiber optic monitoring system are reported. The proposed concept is conceived to satisfy the constraints imposed to be used for safety application, in terms of robustness and reliability, due to full passive optical devices and analog-based circuitry. [...]
2023 - 8 p.
- Published in : IEEE Trans. Instrum. Meas. 72 (2023) 7002408
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Full Analog Fiber Optic Monitoring System Based on Arrayed Waveguide Grating
/ Marrazzo, Vincenzo Romano (Naples U. ; INFN, Naples) ; Fienga, Francesco (Naples U. ; INFN, Naples ; CERN) ; Laezza, Dario (Naples U. ; INFN, Naples) ; Riccio, Michele (Naples U.) ; Irace, Andrea (Naples U.) ; Buontempo, Salvatore (INFN, Naples ; CERN) ; Breglio, Giovanni (Naples U. ; CERN)
Fiber Optic Sensors (FOS), whose advantages have made them widely used in many applications, are up to now not so diffusely used for the monitoring of industrial processes, mainly due to two aspects: the expensiveness and complexity of the sensors monitoring systems. For these reasons, these sensor systems are usually substituted with low performance but easier to manage sensors, in agreement with industrial monitoring standards. [...]
2021 - 7 p.
- Published in : J. Lightwave Technol. 39 (2021) 4990-4996
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Fiber Bragg Grating Sensors as Innovative Monitoring Tool for Beam Induced RF Heating on LHC Beam Pipe
/ Fienga, Francesco (Naples U. ; INFN, Italy ; CERN) ; Marrazzo, Vincenzo Romano (Naples U.) ; Spedding, Sara Bennett (Naples U.) ; Szillasi, Zoltan (Debrecen, Inst. Nucl. Res. ; CERN) ; Beni, Noemi (Debrecen, Inst. Nucl. Res. ; CERN) ; Irace, Andrea (Naples U.) ; Zeuner, Wolfram (CERN) ; Ball, Austin (CERN) ; Vaccaro, Vittorio Giorgio (Naples U.) ; Salvant, Benoit (CERN) et al.
The i-pipe system is a peculiar structural health monitoring system, based on Fiber Bragg Grating technology, installed on the central beam pipe of the compact Muon solenoid (CMS) experiment at CERN. In this contribution, i-pipe temperature sensors, originally conceived as thermal compensator for the strain sensors, are employed to monitor central beam pipe thermal behavior in correlation with the parameters of the particle beam travelling inside, in order to directly measure possible Beam RF induced heating effect. [...]
2021 - 6 p.
- Published in : J. Lightwave Technol. 39 (2021) 4145-4150
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