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1.
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The status of the FCC-ee optics tuning
/ van Riesen-Haupt, Léon (Ecole Polytechnique, Lausanne) ; Franchi, Andrea (ESRF, Grenoble) ; Faus-Golfe, Angeles (IJCLab, Orsay) ; Chance, Antoine (Paris, CEA) ; Dalena, Barbara (Paris, CEA) ; Järmyr Eriksson, Carl (CERN) ; Carli, Christian (CERN) ; Garcia Jaimes, Cristobal Miguel (Ecole Polytechnique, Lausanne) ; Shatilov, Dmitry (CERN) ; Musa, Elaf (DESY) et al.
With a circumference of approximately 91 km, the Future Circular electron-positron Collider, FCC-ee, aims for unprecedented luminosities at beam energies from 45.6 to 182.5 GeV. A major challenge is reaching its design performance in the presence of magnet misalignments and field errors. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) WEPR02
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEPR02
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2.
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Probing FCC-ee energy calibration through resonant depolarization at KARA
/ Zimmermann, Frank (CERN) ; Keintzel, Jacqueline (CERN) ; Mueller, Anke-Susanne (KIT, Karlsruhe) ; Haerer, Bastian (KIT, Karlsruhe) ; Blomley, Edmund (KIT, Karlsruhe) ; Huttel, Erhard (KIT, Karlsruhe) ; Steinmann, Johannes (KIT, Karlsruhe) ; Gethmann, Julian (KIT, Karlsruhe) ; Ruprecht, Robert (KIT, Karlsruhe) ; Pieloni, Tatiana (Ecole Polytechnique, Lausanne) et al.
The FCC-ee collider physics program requires a precise determination of the center-of-mass energy. The average energies of the two colliding beams can be measured by resonant depolarization (RDP) of polarized electron and positron bunches. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) WEPR20
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEPR20
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3.
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Resonant spin depolarization at the test facility KARA: overview of recent efforts
/ Blomley, Edmund (KIT, Karlsruhe) ; Müller, Anke-Susanne (KIT, Karlsruhe) ; Härer, B (KIT, Karlsruhe) ; Huttel, Erhard (KIT, Karlsruhe) ; Zimmermann, Frank (CERN) ; Keintzel, Jacqueline (CERN) ; Steinmann, Johannes (KIT, Karlsruhe) ; Gethmann, Julian (KIT, Karlsruhe) ; Ruprecht, Robert (KIT, Karlsruhe)
The Karlsruhe research accelerator KARA offers a setup to measure the beam energy with resonant spin depolarization. The depolarization is excited by the stripline kickers of the bunch-by-bunch feedback system and the resonant frequency is measured via change in Touschek lifetime. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) WEPG51
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEPG51
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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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Selected advances in the accelerator design of the Future Circular Electron-Positron Collider (FCC-ee)
/ FCC Collaboration
In autumn 2023, the FCC Feasibility Study underwent a crucial “mid-term review”. We describe some accelerator performance risks for the proposed future circular electron-positron collider, FCC-ee, identified for, and during, the mid-term review. [...]
FERMILAB-CONF-24-0659-AD-PIP2.-
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) WEPR14
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEPR14
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6.
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LHC 2023 ion optics commissioning
/ Ferrentino, Vittorio (Naples U. ; CERN) ; Wegscheider, Andreas (CERN) ; Gilardi, Antonio (CERN) ; Fol, Elena (CERN) ; Maclean, Ewen (CERN) ; Carlier, Felix (CERN) ; Soubelet, Felix (CERN) ; Keintzel, Jacqueline (CERN) ; Cardona, Javier (Colombia, U. Natl.) ; Dilly, Joschua (CERN) et al.
In 2023, about 2 months of LHC operation were devoted to Heavy Ion physics. In this paper, results of the 2023 ion optics commissioning are reported. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) MOPC20
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPC20
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7.
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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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8.
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Progress of the FCC-ee optics tuning working group
/ Bauche, J (CERN) ; da Silva, T (IRFU, Saclay) ; Shatilov, D (CERN) ; Chance, A (IRFU, Saclay) ; Wu, Y (Ecole Polytechnique, Lausanne) ; Wang, Y (Beijing, Inst. High Energy Phys.) ; Tomas, Rogelio (CERN) ; Franchi, Andrea (ESRF, Grenoble) ; Faus-Golfe, Angeles (IJCLab, Orsay) ; Dalena, Barbara (IRFU, Saclay) et al.
FCC-ee is a proposed lepton collider with a circumference close to 100 km to produce an unprecedented amount of luminosity. The FCC-ee optics tuning working group is addressing one of the most critical aspects of the FCC-ee, that is the recovery of the optics design performance in presence of realistic imperfections. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) WEPL023
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPL023
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9.
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FCC-ee Lattice Design
/ Keintzel, Jacqueline (CERN) ; Abramov, Andrey (CERN) ; Benedikt, Michael (CERN) ; Hofer, Michael (CERN) ; Hunchak, Patrick (Saskatchewan U.) ; Oide, Katsunobu (CERN) ; Raubenheimer, Tor (SLAC) ; Tomás García, Rogelio (CERN) ; Zimmermann, Frank (CERN)
Within the framework of the Future Circular Collider Feasibility and Design Study, the design of the electron-positron collider FCC-ee is being optimised, as a possible future double collider ring, currently foreseen to start operation during the 2040s. FCC-ee is designed to operate at four different energy stages, allowing for precision measurements: from the Z-pole up to above the ttbar-threshold. [...]
2023 - 9 p.
- Published in : JACoW eeFACT 2022 (2023) 52-60
Fulltext: PDF;
In : 65th ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+ e- Colliders (eeFACT2022), INFN, Frascati, Italy, 12 - 16 Sep 2022, pp.52-60
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10.
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The status of the energy calibration, polarization and monochromatization of the FCC-ee
/ Bauche, Jeremie (CERN) ; Blondel, Alain (CERN) ; Ciarma, Andrea (Frascati) ; Faus-Golfe, Angeles (IJCLab, Orsay) ; Bogomyagkov, Anton (Novosibirsk, IYF) ; Martens, Aurélien (IJCLab, Orsay) ; Gaskell, David (Jefferson Lab) ; Sagan, David (Cornell U.) ; Barber, Desmond (New Mexico U.) ; Shatilov, Dmitry (CERN) et al.
The Future Circular electron-positron Collider, FCC- ee, is designed for unprecedented precision for particle physics experiments from the Z-pole up to above the top-pair-threshold, corresponding to a beam energy range from 45.6 to 182.5 GeV. Performing collisions at various particle-physics resonances requires precise knowledge of the centre-of-mass energy (ECM) and collision boosts at all four interaction points. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL059
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL059
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