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1.
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Long-range beam-beam mitigation for round optics
/ Fartoukh, Stephane (CERN) ; Kostoglou, Sofia (CERN)
When colliding high intensity bunch trains at low beta*, a sufficiently large crossing angle needs to be imposed at the interaction point (IP) in order to separate the two beams before and after the collision, and mitigate the so-called long-range beam-beam (BBLR) effect, which otherwise can be very detrimental to the beam lifetime. [...]
CERN-ACC-NOTE-2023-0029.
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2023
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2.
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Impact of octupoles on the Schottky spectra of bunched beams
/ Lannoy, Christophe (CERN ; Ecole Polytechnique, Lausanne) ; Alves, Diogo (CERN) ; Lasocha, Kacper (CERN) ; Mounet, Nicolas (CERN) ; Pieloni, Tatiana (Ecole Polytechnique, Lausanne)
Schottky monitors serve as non-invasive tools for beam diagnostics, providing insights into crucial bunch characteristics such as tune, chromaticity, bunch profile, or synchrotron frequency distribution. However, octupole magnets commonly used in circular storage rings to mitigate instabilities through the Landau damping mechanism, can significantly affect the Schottky spectrum. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) WEPG32
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEPG32
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3.
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Status of beam-beam studies for the high-luminosity LHC
/ Droin, Colas (CERN) ; Sterbini, Guido (CERN) ; Efthymiopoulos, Ilias (CERN) ; Mounet, Nicolas (CERN) ; De Maria, Riccardo (CERN) ; Tomas, Rogelio (CERN) ; Kostoglou, Sofia (CERN)
Optimizing the configuration of an operational cycle of a collider such as the LHC is a complex process, requiring various simulation studies. In particular, Dynamic Aperture (DA) simulations, based on particle tracking, serve as indispensable tools for achieving this goal. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) THPC77
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.THPC77
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4.
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LHC optics commissioning in 2023 and 2024
/ Persson, Tobias (CERN) ; Wegscheider, Andreas (CERN) ; Fol, Elena (CERN) ; Maclean, Ewen (CERN) ; Carlier, Felix (CERN) ; Soubelet, Felix (CERN) ; Trad, Georges (CERN) ; Keintzel, Jacqueline (CERN) ; Cardona, Javier (Columbia U.) ; Dilly, Joschua (CERN) et al.
The LHC machine configuration was changed in 2023 compared to previous years, requiring a new set of optics configurations to be measured and corrected. A telescopic optics was deployed in energy the ramp for the first time, which gave rise to a beta-beating of up to 25% [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) MOPC12
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPC12
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5.
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Study of the corrector systems for the new lattice of the CERN hadron-hadron Future Circular Collider
/ Perez-Segurana, Gustavo (CERN) ; Todesco, Ezio (CERN) ; Giovannozzi, Massimo (CERN)
A new layout for the energy-frontier hadron collider (FCC-hh) under study at CERN has been designed, following the constraints imposed by the outcome of recent tunnel placement studies. The new lattice and the need to maximize the dipole filling factor triggered a deep revision of the corrector systems located in the regular arcs, such as orbit, tune, linear coupling, and chromaticity correctors. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) MOPC15
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPC15
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6.
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Experimental and simulated LHC Schottky spectra
/ Lannoy, Christophe (CERN ; Ecole Polytechnique, Lausanne) ; Alves, Diogo (CERN) ; Lasocha, Kacper (CERN) ; Mounet, Nicolas (CERN) ; Pieloni, Tatiana (Ecole Polytechnique, Lausanne)
Schottky monitors are valuable non-invasive tools used for beam diagnostics, providing insights into crucial bunch characteristics such as tune, chromaticity, bunch profile, or synchrotron frequency distribution. This study investigates Schottky spectra at the Large Hadron Collider (LHC) through a combination of simulations and measurements. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) WEPG31
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEPG31
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7.
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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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8.
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9.
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Increasing High Luminosity LHC Dynamic Aperture Using Optics Optimizations
/ De Maria, Riccardo (CERN) ; Angelis, Yannis (CERN ; Aristotle U., Thessaloniki) ; Droin, Colas (CERN) ; Kostoglou, Sofia (CERN) ; Plassard, Fabien (CERN) ; Sterbini, Guido (CERN) ; Tomás García, Rogelio (CERN)
CERN’s Large Hadron Collider (LHC) is expected to operate with unprecedented beam current and brightness from the beginning of Run 4 in 2029. In the context of the High Luminosity LHC project, the baseline operational scenarios are currently being developed. [...]
2024 - 4 p.
- Published in : JACoW HB 2023 (2024) 507-510
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.507-510
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10.
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Optimizing Resonance Driving Terms Using MAD-NG Parametric Maps
/ Deniau, Laurent (CERN) ; Kostoglou, Sofia (CERN) ; Maclean, Ewen (CERN) ; Paraschou, Konstantinos (CERN) ; Persson, Tobias (CERN) ; Tomás García, Rogelio (CERN)
In 2023, a review of the LHC octupolar resonance driving terms at injection was carried out, motivated by two observations: (i) unwanted losses during the injection process with strongly powered octupoles and (ii) an expected reduction in emittance growth from e-cloud effects in simulations with weaker octupolar resonances. The MAD-NG code was used to simultaneously optimise the main octupolar resonances: 4Qx, 4Qy, and 2Qx-2Qy by adjusting 16 quadrupole families and 16 octupole families, for a total of 32 parameters. [...]
2024 - 4 p.
- Published in : JACoW HB 2023 (2024) 483-486
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.483-486
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