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Risk of Halo-Induced Magnet Quenches in the HL-LHC Beam Dump Insertion
/ Potoine, Jean-Baptiste (CERN ; Montpellier U.) ; Apollonio, Andrea (CERN) ; Belli, Eleonora (CERN) ; Bracco, Chiara (CERN) ; Bruce, Roderik (CERN) ; D'Andrea, Marco (CERN) ; García Alía, Ruben (CERN) ; Lechner, Anton (CERN) ; Lerner, Giuseppe (CERN) ; Morales Vigo, Sara (CERN) et al.
After the High Luminosity (HL-LHC) upgrade, the LHC will be exposed to a higher risk of magnet quenches during periods of short beam lifetime. Collimators in the extraction region (IR6) assure the protection of magnets against asynchronous beam dumps, but they also intercept a fraction of the beam halo leaking from the betatron cleaning insertion. [...]
2021 - 4 p.
- Published in : 10.18429/JACoW-IPAC2021-MOPAB002
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.41
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2.
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Power Deposition in Superconducting Dispersion Suppressor Magnets Downstream of the Betatron Cleaning Insertion for HL-LHC
/ Waets, Andreas (CERN) ; Bahamonde Castro, Cristina (CERN) ; Belli, Eleonora (CERN) ; Bruce, Roderik (CERN) ; Fuster-Martínez, Nuria (CERN) ; Lechner, Anton (CERN) ; Mereghetti, Alessio (CERN) ; Redaelli, Stefano (CERN) ; Sabaté-Gilarte, Marta (CERN) ; Skordis, Eleftherios (CERN)
The power deposited in dispersion suppressor magnets downstream of the Large Hadron Collider (LHC) betatron cleaning insertion is governed by off-momentum particles scattered out of the primary collimators. In order to mitigate the risk of magnet quenches during periods of short beam lifetime in future High-Luminosity (HL-LHC) operation, new dispersion suppressor (DS) collimators are considered for installation (one per beam). [...]
2021 - 4 p.
- Published in : 10.18429/JACoW-IPAC2021-MOPAB001
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, Br, 24 - 28 May 2021, pp.37-40
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3.
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Mitigation of the impedance-related collective effects in FCC-ee
/ Zobov, Mikhail (Frascati) ; Belli, E (CERN) ; Kersevan, Roberto (CERN) ; Novokhatski, A (SLAC) ; Zadeh, S G (Rostock U.) ; Migliorati, Mauro (Rome U.)
In order to achieve a high luminosity in the electron-positron Future Circular Collider (FCC-ee), very intense multi-bunch beams with low emittances are accumulated in two separate rings and collide in two interaction regions exploiting the crab waist collision scheme. In order to preserve beam quality and to avoid collider performance degradation a careful study of beam collective effects is required. [...]
2020 - 7 p.
- Published in : 10.23732/CYRCP-2020-009.279
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.279-285 (CERN-2020-009)
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4.
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Run 2 Collimation Overview
/ Fuster Martinez, N. (CERN) ; Abramov, A (CERN ; Royal Holloway, U. of London) ; Azzopardi, G (CERN ; Malta U.) ; Belli, E (CERN) ; Boscolo-Meneguolo, C (CERN) ; Bruce, R (CERN) ; D' Andrea, M. (CERN ; Padua U.) ; Di Castro, M. (CERN) ; Fiascari, M (CERN) ; Fomin, A (CERN ; Kharkov, KIPT) et al.
The LHC collimation system is designed to provide protection against regular and abnormal losses in order to reduce the risk of quenches of the superconducting magnets as well as the background in the experiments. All Run 2 proton and ion runs were successfully completed with no magnet quenches from slow losses of the circulating beam. [...]
2019 - 16 p.
- Published in : , pp. 149-164
Fulltext: PDF;
In : 9th LHC Operations Evian Workshop, Evian Les Bains, France, 30 Jan - 1 Feb 2019, pp.149-164
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5.
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Electron cloud effects at the CERN accelerators
/ Rumolo, G (CERN) ; Bartosik, H (CERN) ; Belli, E (CERN) ; Iadarola, G (CERN) ; Li, K (CERN) ; Mether, L (CERN) ; Romano, A (CERN) ; Zimmermann, F (CERN) ; Dijkstal, P (PSI, Villigen) ; Schenk, M (Ecole Polytechnique, Lausanne)
Electron cloud eects have been identified as one of themain performance limitations for some of the synchrotronsof the CERN accelerator complex. The tools for the simula-tion of the electron cloud build-up and its eects on beamstability have significantly evolved in recent years, leadingto a much better understanding of all machine observations.At the same time, electron cloud mitigation measures havebeen tested (e.g. [...]
Geneva : CERN, 2020 - 7 p.
Fulltext: PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.13-20 (CERN-2020-007)
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7.
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Single Bunch Instabilities and NEG Coating for FCC-ee
/ Belli, Eleonora (Rome U.) ; Costa Pinto, Pedro (CERN) ; Migliorati, Mauro (INFN, Rome) ; Rumolo, Giovanni (CERN) ; Sapountzis, Antonios (CERN) ; Sinkovits, Theo (CERN) ; Taborelli, Mauro (CERN) ; Zobov, Mikhail (Frascati)
The high luminosity electron-positron collider FCC-ee is part of the Future Circular Collider (FCC) study at CERN and it has been designed to cover the beam energy range from 45.6 GeV to 182.5 GeV to study the properties of the Higgs boson and other particles. Electron cloud build up simulations on the Z resonance revealed the necessity of minimising the Secondary Electron Yield (SEY) of the pipe walls by applying a Ti-Zr-V Non-Evaporable Getter (NEG) coating in the entire ring. [...]
JACOW, 2019 - 7 p.
- Published in : 10.18429/JACoW-eeFACT2018-WEOAB04
Published fulltext: PDF;
In : 62nd ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e− Colliders, Hong Kong, China, 24 - 27 Sep 2018, pp.WEOAB04
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8.
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Crystal Collimation Tests with Pb Ion Beams
/ D'Andrea, Marco (Universita e INFN, Padova (IT)) ; Mirarchi, Daniele (University of Manchester (GB)) ; Redaelli, Stefano (CERN) ; Fomin, Alex (NSC Kharkiv Institute of Physics and Technology (UA)) ; Belli, Eleonora (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Nevay, Laurence James (University of London (GB)) ; Rossi, Roberto (Sapienza Universita e INFN, Roma I (IT)) ; Scandale, Walter (CERN) ; Montesano, Simone (Universita e INFN, Bologna (IT)) et al.
During MD4168, performed on November 27th 2018, silicon crystals for a crystal-assisted collimation system were tested. [...]
CERN-ACC-NOTE-2019-0024.
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2019.
Full text
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9.
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Machine detector interface for the $e^+e^-$ future circular collider
/ Boscolo, M. (Frascati) ; Blanco-Garcia, O.R. (Frascati) ; Bacchetta, N. (CERN) ; Belli, E. (CERN) ; Benedikt, M. (CERN) ; Burkhardt, H. (CERN) ; Gil Costa, M. (CERN) ; Elsener, K. (CERN) ; Leogrande, E. (CERN) ; Janot, P. (CERN) et al.
The international Future Circular Collider (FCC) study aims at a design of $pp$, $e^+e^-$, $ep$ colliders to be built in a new 100 km tunnel in the Geneva region. The $e^+e^-$ collider (FCC-ee) has a centre of mass energy range between 90 (Z-pole) and 375 GeV (tt_bar). [...]
arXiv:1905.03528; ISBN: 978-3-95450-216-5.-
2019-04-21 - 6 p.
- Published in : 10.18429/JACoW-eeFACT2018-WEXBA02
Fulltext: 1905.03528 - PDF; fulltext1733990 - PDF;
In : 62nd ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e− Colliders, Hong Kong, China, 24 - 27 Sep 2018, pp.WEXBA02
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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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