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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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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 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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4.
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5.
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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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6.
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FCC-hh transverse impedance budget
/ Arsenyev, Sergey (CERN) ; Boine-Frankenheim, Oliver (Darmstadt, Tech. U. ; Darmstadt, GSI) ; Schulte, Daniel (CERN)
Contributions of different machine elements of the proposed Future Circular Collider (FCC-hh) impedance budget are calculated based on beam stability considerations. For each element (the beamscreen, the collimators, etc), effective impedances are calculated at the injection energy and at the collision energy for considered instabilities. [...]
CERN-ACC-2018-152.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-MOPMF029
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF029
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7.
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Transverse beam coupling impedance studies at the CERN Proton Synchrotron Booster after the LHC Injectors Upgrade
/ Antuono, C (CERN ; Rome U.) ; Asvesta, F (CERN) ; Rumolo, G (CERN) ; Zannini, C (CERN) ; Migliorati, M (Rome U.)
After the LHC Injectors Upgrade (LIU) project, the CERN Proton Synchrotron Booster (PSB) operates with a new injection kinetic energy of 160 MeV and an extraction energy of 2 GeV. In light of this, several measurements have been performed to characterize the behaviour of the accelerator in terms of beam stability and beam coupling impedance in the new energy range. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) WEPL154
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPL154
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Understanding of the LHC warm vacuum module heating
/ Krkotic, Patrick (CERN) ; Baglin, Vincent (CERN) ; Chiggiato, Paolo (CERN) ; Papaphilippou, Yannis (CERN) ; Rumolo, Giovanni (CERN) ; Antuono, Chiara (CERN ; Rome U.) ; Bregliozzi, Giuseppe (CERN) ; Calatroni, Sergio (CERN) ; de la Fuente, Elena (CERN ; Madrid, Polytechnic U.) ; Galloro, Alessio (Calabria U. ; CERN) et al.
During the third run of the Large Hadron Collider in 2023, which had the highest intensity bunch population compared to previous runs, increased losses attributed to pressure spikes within a warm vacuum sector triggered a beam dump. Subsequent inspections revealed localised annealing and plasticisation of the tension spring in the sliding contact radio-frequency finger module, alongside traces of vapour deposition on the various module components with the stainless-steel spring material. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) TUAN3
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.TUAN3
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Impact of a Wideband Feedback Prototype System on TMCI in the SPS
/ Höfle, Wolfgang (CERN) ; Bartosik, Hannes (CERN) ; Bjørsvik, Endre (CERN) ; Dusatko, John (SLAC) ; Fox, John (SLAC) ; Kotzian, Gerd (CERN) ; Levens, Thomas (CERN) ; Li, Kevin (CERN) ; Rivetta, Claudio (SLAC) ; Turgut, Ozhan (Stanford U.)
The transverse mode coupling instability (TMCI) in the SPS has been identified as one of the potential performance limitations for future high intensity LHC beams that will be required for the High Luminosity (HL)-LHC era and is being addressed by the LHC Injector Upgrade Project (LIU). A potential mitigation can be provided by wideband feedback systems with a frequency reach of about 1 GHz . [...]
CERN-ACC-2018-169.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-TUZGBD4
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUZGBD4
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