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Studies of FCC-ee Single Bunch Instabilities with an Updated Impedance Model
/ Migliorati, M (INFN, Rome ; Rome U.) ; Behtouei, M (Frascati) ; Carideo, E (INFN, Rome ; Rome U. ; CERN) ; Rajabi, A (DESY) ; Zhang, Y (Beijing, Inst. High Energy Phys.) ; Zobov, M (Frascati)
The ongoing FCC-ee collider design aims at optimizing beam parameters and developing the different accelerators systems. For this reason, the coupling impedance modeling is in evolution following the design of the collider vacuum chamber and hardware components. [...]
2024 - 8 p.
- Published in : J. Phys. : Conf. Ser.: 2687 (2024) , no. 6, pp. 062010
- Published in : JACoW IPAC: 2023 (2023) , pp. WEPL165
Fulltext: PublicationJACoW - PDF; PublicationIOP - PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.062010
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2.
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Studies and Mitigation of Collective Effects in FCC-ee
/ Migliorati, Mauro (U. Rome La Sapienza (main) ; INFN, Rome) ; Antuono, Chiara (CERN ; U. Rome La Sapienza (main)) ; Behtouei, Mostafa (Frascati) ; Carideo, Emanuela (CERN ; U. Rome La Sapienza (main) ; INFN, Rome) ; Spataro, Bruno (Frascati) ; Zhang, Yuan (Beijing, Inst. High Energy Phys.) ; Zobov, Mikhail (Frascati)
In order to achieve a high luminosity in the future electron-positron circular collider (FCC-ee), very intense multi-bunch colliding beams should have nanometer scale transverse beam sizes at the collision points. For this purpose the emittances of the colliding beams are chosen to be very small, comparable to those of the modern synchrotron light sources, while the stored beam currents should be close to the best values achieved in the last generation of particle factories. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 1583-1586
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1583-1586
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Studies and mitigation of TMCI in FCC-ee
/ Migliorati, Mauro (Rome U. ; INFN, Rome) ; Zannini, Carlo (CERN) ; Antuono, Chiara (CERN) ; Gibellieri, Dora (Rome U. ; CERN) ; Zobov, Mikhail (Frascati) ; Behtouei, Mostafa (Frascati) ; Soos, Roxana (IJCLab, Orsay ; CERN) ; Zhang, Yuan (Beijing, Inst. High Energy Phys.)
Previous studies have identified turbulent mode coupling instability (TMCI) as one of the most severe single-bunch instabilities in the FCC-ee collider, potentially limiting its performance. Its threshold is influenced by both transverse and longitudinal wakefields arising from vacuum chamber resistive wall effects, discontinuities, and beam-beam interactions, the latter of which can be seen as a transverse cross-wake force.In this paper, we investigate the TMCI using the most recent collider parameters and an updated impedance model. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) THPC60
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.THPC60
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4.
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Transverse and Longitudinal Single Bunch Instabilities in FCC-ee
/ Carideo, Emanuela (CERN ; INFN, Rome ; Rome U.) ; De Arcangelis, Daniele (Rome U. ; INFN, Rome) ; Migliorati, Mauro (Rome U. ; INFN, Rome) ; Quartullo, Danilo (CERN) ; Zimmermann, Frank (CERN) ; Zobov, Mikhail (Frascati)
Improving the accuracy of the impedance model of an accelerator is important for keeping beam instabilities and power loss under control. Here, by means of the PyHEAD- TAIL tracking code, we first review the longitudinal mi- crowave instability threshold for FCC-ee by taking into ac- count the longitudinal impedance model evaluated so far. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 3153-3156
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3153-3156
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Impedance modelling and collective effects in the Future Circular e$^{+}$e$^{−}$ Collider with 4 IPs
/ Migliorati, M. (U. Rome La Sapienza (main) ; INFN, Rome) ; Antuono, C. (INFN, Rome ; U. Rome La Sapienza (main) ; CERN) ; Carideo, E. (U. Rome La Sapienza (main) ; INFN, Rome ; CERN) ; Zhang, Y. (Beijing, Inst. High Energy Phys.) ; Zobov, M. (LNF, Dafne Light)
The FCC-ee impedance model is being constantly updated closely following the vacuum chamber design and parameters evolution. In particular, at present, a thicker NEG coating of 150 nm (instead of previous 100 nm) has been suggested by the vacuum experts, and a more realistic impedance model of the bellows has been investigated. [...]
arXiv:2204.04616.-
2022-08-25 - 16 p.
- Published in : EPJ Tech. Instrum. 9 (2022) 10
Fulltext: document - PDF; 2204.04616 - PDF;
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Combined Effect of Beam-Beam Interaction and Beam Coupling Impedance in Future Circular Colliders
/ Zhang, Yuan (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Carideo, Emanuela (CERN ; Rome U. ; INFN, Rome) ; Migliorati, Mauro (Rome U. ; INFN, Rome) ; Wang, Na (Beijing, Inst. High Energy Phys.) ; Zobov, Mikhail (Frascati)
The future large scale electron-positron colliders, such as FCC-ee in Europe and CEPC in China, will rely on the crab waist collision scheme with a large Piwinski angle. Differently from the past generation colliders both luminosity and beam-beam tune shifts depend on the bunch length in such a collision scheme. [...]
JACoW, 2021 - 6 p.
- Published in : JACoW IPAC 2021 (2021) 25-30
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.25-30
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Study of Collective Effects in the FCC-ee Collider
/ Zobov, Mikhail (Frascati) ; Belli, Eleonora (CERN ; Rome U. ; INFN, Rome) ; Castorina, Giovanni (Rome U. ; INFN, Rome) ; Migliorati, Mauro (Rome U. ; INFN, Rome) ; Persichelli, Serena (LBNL, Berkeley) ; Rumolo, Giovanni (CERN) ; Spataro, Bruno (Frascati)
The Future Circular Collider (FCC) study aims at designing different options of a post-LHC collider. The high luminosity electron-positron collider FCC-ee based on the crab waist concept is considered as an intermediate step on the way towards FCC-hh, a 100 TeV hadron collider using the same tunnel of about 100 km. [...]
arXiv:1805.08466.-
2019-06-24 - 6 p.
- Published in : J. Phys.: Conf. Ser. 1238 (2019) 012061
Fulltext: PDF; Fulltext from Publisher: PDF;
In : 4th International Conference Laser and Plasma Research and Technologies, Moscow, Russia, 30 Jan - 1 Feb 2018, pp.012061
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9.
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An interplay between beam–beam and beam coupling impedance effects in the Future Circular e$^+$e$^-$ Collider
/ Migliorati, M (U. Rome La Sapienza (main) ; INFN, Rome) ; Carideo, E (U. Rome La Sapienza (main) ; INFN, Rome ; CERN) ; De Arcangelis, D (U. Rome La Sapienza (main) ; INFN, Rome) ; Zhang, Y (Beijing, Inst. High Energy Phys.) ; Zobov, M (Frascati)
In order to reach high luminosity, the Future Circular e$^+$e$^-$ Collider will need very intense beams with small emittances and small beta functions in the interaction points. This is achieved with a large Piwinski angle combined with the crab waist collision scheme. [...]
2021 - 19 p.
- Published in : Eur. Phys. J. Plus 136 (2021) 1190
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10.
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Single Bunch Instabilities in FCC-ee
/ Belli, Eleonora (CERN) ; Castorina, Giovanni (INFN, Rome) ; Migliorati, Mauro (INFN, Rome) ; Rumolo, Giovanni (CERN) ; Spataro, Bruno (Frascati) ; Zobov, Mikhail (Frascati)
FCC-ee is a high luminosity lepton collider with a centre-of-mass energy from 91 to 365 GeV. Due to the machine parameters and pipe dimensions, collective effects due to electromagnetic fields produced by the interaction of the beam with the vacuum chamber can be one of the main limitations to the machine performance. [...]
IPAC-2018-THPAK052.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-THPAK052
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.3336-3339
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