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21.
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Electromagnetic characterization of the crystal primary collimators for the HL-LHC
/ Quartullo, D (Rome U. ; INFN, Rome) ; Arpaia, P (Naples U.) ; Biancacci, N (CERN) ; Giordano, F (CERN ; Naples U.) ; Lamas Garcia, I (CERN) ; Mostacci, A (Rome U. ; INFN, Rome) ; Palumbo, L (Rome U.) ; Redaelli, S (CERN) ; Salvant, B (CERN) ; Teofili, L (CERN) et al.
The crystal-based primary collimators installed in the Large Hadron Collider (LHC) at CERN use the channelling process in bent crystals to steer halo particles efficiently onto downstream collimators. This scheme, called crystal collimation, is also considered for applications of fixed-target implementations in the context of the Physics Beyond Collider at the LHC. [...]
2021 - 18 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1010 (2021) 165465
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22.
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23.
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Gamma Factory for CERN initiative - progress report
/ Dutheil, Yann (CERN) ; Abramov, Andrey (Royal Holloway, U. of London) ; Alden, Siobhan (Royal Holloway, U. of London) ; Alemany Fernandez, Reyes (CERN) ; Antsiferov, Pavel (Troitsk, IZMIRAN) ; Apyan, Armen (NAS Armenia, Yerevan) ; Bartosik, Hannes (CERN) ; Bessonov, Evgeny (Lebedev Inst.) ; Biancacci, Nicolo (CERN) ; Bieron, Jacek (Jagiellonian U.) et al.
The Gamma Factory (GF) initiative proposes to use partially stripped ion (PSI) beams as drivers of a new type of high-intensity and high-energy (0.1–400 MeV) photon source. As part of the ongoing Physics Beyond Collider studies, initial beam tests were carried out in 2017 and 2018 at the SPS and LHC with partially stripped xenon and lead beams [...]
CERN-PBC-CONF-2021-006.-
SISSA, 2020 - 10 p.
- Published in : PoS EPS-HEP2019 (2020) 020
Fulltext from publisher: PDF;
In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.020
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24.
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Impedance reduction for LHC collimators
/ Mereghetti, A (CERN) ; Amorim, D (CERN) ; Antipov, S A (CERN) ; Biancacci, N (CERN) ; Bruce, R (CERN) ; Carra, F (CERN) ; Métral, E (CERN) ; Mounet, N (CERN) ; Redaelli, S (CERN) ; Salvant, B (CERN)
The LHC at CERN is equipped with a sophisticated collimation system, aimed at protecting superconducting magnets against quenches in case of losses from the circulating beams. The collimation system is one of the major contributors to the machine impedance at top energy. [...]
2020 - 7 p.
- Published in : 10.23732/CYRCP-2020-009.179
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.179-185 (CERN-2020-009)
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25.
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Low impedance design with example of kickers (including cables) and potential of metamaterials
/ Zannini, C (CERN) ; Barnes, M.J. (CERN) ; Biancacci, N (CERN) ; Danisi, A (CERN) ; Koukovini-Platia, E (CERN) ; Métral, E (CERN) ; Rumolo, G (CERN) ; Salvant, B (CERN)
Unmatched terminations of single elements were recently identified to be responsible for beam instabilities in the CERN PSB and LEIR machines. Impedance models are needed to estimate the impedance of similar devices and to assess potential intensity limitations. [...]
2020 - 8 p.
- Published in : 10.23732/CYRCP-2020-009.167
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.167 (CERN-2020-009)
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26.
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Impedance localization and identification
/ Biancacci, N (CERN) ; Fernández, R Alemany (CERN) ; Alexahin, Y (Fermilab) ; Carlà, M (CERN) ; Eldred, J (Fermilab) ; Höfle, W (CERN) ; Huschauer, A (CERN) ; Levens, T (CERN) ; Malina, L (CERN) ; Métral, E (CERN) et al.
The beam coupling impedance represents one of the sources of potential beam instabilities in particle accelerators. The localization of large coupling impedance sources is therefore very important in order to focus the efforts for mitigation measures when these are needed. [...]
2020 - 7 p.
- Published in : 10.23732/CYRCP-2020-009.141
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.141 (CERN-2020-009)
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27.
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Transverse damper and stability diagram
/ Antipov, S A (CERN ; DESY) ; Amorim, D (CERN ; SOLEIL, Saint-Aubin) ; Biancacci, N (CERN) ; Buffat, X (CERN) ; Métral, E (CERN) ; Mounet, N (CERN) ; Oeftiger, A (CERN ; Darmstadt, GSI) ; Valuch, D (CERN)
We describe a proof-of-principle test to measure Landau damping in a hadron ring using a destabilizing transverse feedback acting as a controllable source of beam coupling impedance. The test was performed at the Large Hadron Collider and stability diagrams for a range of its Landau octupole strengths have been measured for its injection energy of 450 GeV. [...]
2020 - 9 p.
- Published in : 10.23732/CYRCP-2020-009.121
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.121-129 (CERN-2020-009)
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28.
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Fast-slow mode coupling instability for coasting beams in the presence of detuning impedance
/ Biancacci, N (CERN) ; Métral, E (CERN) ; Migliorati, M (INFN, Rome ; Rome U.)
A destabilizing effect of the detuning impedance has been recently observed in simulations of the CERN Proton Synchrotron (PS) at the injection energy: while without the detuning impedance the instability is faster in the vertical plane as expected (due to the elliptical shape of the vacuum chamber), with detuning impedance the instability appears to be faster in the horizontal plane. In order to understand the detuning impedance destabilizing effect, we study the collective behavior for the simpler case of a coasting beam with PS-like parameters and a simplified impedance model. [...]
2021 - 7 p.
- Published in : Phys. Rev. Accel. Beams: 23 (2021) , no. 12, pp. 124402
- Published in : Phys. Rev. Accel. Beams: 24 (2021) , no. 7, pp. 078002
Addendum: PDF; Fulltext from Publisher: PDF;
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29.
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Transverse Instabilities
/ Buffat, X (CERN) ; Amorim, D (CERN) ; Antipov, S (CERN) ; Arduini, G (CERN) ; Biancacci, N (CERN) ; Carver, L (CERN) ; Furuseth, S V (CERN) ; Iadarola, G (CERN) ; Li, K (CERN) ; Mether, L (CERN) et al.
The observations of coherent instabilities in all operational phases of the LHC
during Run 2 are summarised, describing their impact on the performance. The
evolution of the mitigation strategies and of the beam instability models since
the start up of the LHC are described and serve as a basis for the development
of a strategy for Run 3. [...]
Geneva, Switzerland : , 2019 - 11 p.
- Published in : , pp. 233-243
Fulltext: PDF;
In : 9th LHC Operations Evian Workshop, Evian Les Bains, France, 30 Jan - 1 Feb 2019, pp.233-243
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30.
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Injectors Beam Performance Evolution during Run 2
/ Bartosik, H (CERN) ; Albright, S (CERN) ; Alemany, R (CERN) ; Antoniou, F (CERN) ; Asvesta, F (CERN) ; Benedetto, E (CERN) ; Bellodi, G (CERN) ; Biancacci, N (CERN) ; Bohl, T (CERN) ; Cornelis, K (CERN) et al.
This contribution gives an overview of the beam performance of the LHC injector
chain during Run 2. In the first part the various beam types used for LHC
luminosity production with protons (e.g. [...]
2019 - 8 p.
- Published in : , pp. 51-58
Fulltext: PDF;
In : 9th LHC Operations Evian Workshop, Evian Les Bains, France, 30 Jan - 1 Feb 2019, pp.51-58
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