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1.
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HL-LHC Beam Dynamics with Hollow Electron Lenses
/ Hermes, Pascal (CERN) ; Bruce, Roderik (CERN) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Mereghetti, Alessio (CERN) ; Mirarchi, Daniele (CERN) ; Redaelli, Stefano (CERN) ; Stancari, Giulio (Fermilab)
Each of the two proton beams in the High-Luminosity Large Hadron Collider (HL-LHC) will carry a total energy of 700 MJ. One concern for machine protection is the energy stored in the transverse beam halo, estimated to potentially reach up to 5% of the total stored energy. [...]
FERMILAB-CONF-22-369-AD.-
2022 - 6 p.
- Published in : JACoW HB 2021 (2022) 59-64
Fulltext: jt - PDF; document - PDF; External link: Fermilab Library Server
In : 64th ICFA Advanced Beam Dynamics Workshop on High Intensity and High Brightness Hadron Beams (HB 2021), Batavia, Illinois, United States, 4 - 9 Oct 2021, pp.59-64
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2.
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First Experience of Crystal Collimators During LHC Special Runs and Plans for the Future
/ D'Andrea, Marco (CERN ; U. Padua (main)) ; Avati, Valentina (CERN ; AGH-UST, Cracow) ; Bruce, Roderik (CERN) ; Butcher, Mark (CERN) ; Deile, Mario (CERN) ; Di Castro, Mario (CERN) ; Dziedzic, Bartosz (Cracow, INP) ; Garcia Morales, Hector (CERN ; Royal Holloway, U. of London) ; Gavrikov, Yury (St. Petersburg, INP ; CERN) ; Hiller, Karlheinz (DESY, Zeuthen) et al.
Bent crystals can deflect charged particles by trapping them within the potential well generated by neighboring crystalline planes and forcing them to follow the curvature of the crystal itself. This property has been extensively studied over the past decade at the CERN accelerator complex, as well as in other laboratories, for a variety of applications, ranging from beam collimation to beam extraction and in-beam fixed target experiments. [...]
2022 - 6 p.
- Published in : JACoW HB 2021 (2022) 12-17
Fulltext: PDF;
In : 64th ICFA Advanced Beam Dynamics Workshop on High Intensity and High Brightness Hadron Beams (HB 2021), Batavia, Illinois, United States, 4 - 9 Oct 2021, pp.12-17
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3.
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Modeling Particle Stability Plots for Accelerator Optimization Using Adaptive Sampling
/ Schenk, Michael (Ecole Polytechnique, Lausanne ; CERN) ; Coyle, Loic (CERN ; Ecole Polytechnique, Lausanne) ; Giovannozzi, Massimo (CERN) ; Krymova, Ekaterina (Ecole Polytechnique, Lausanne ; Zurich, ETH) ; Mereghetti, Alessio (CERN ; CNAO, Milan) ; Obozinski, Guillaume (Ecole Polytechnique, Lausanne ; Zurich, ETH) ; Pieloni, Tatiana (CERN ; Ecole Polytechnique, Lausanne)
One key aspect of accelerator optimization is to maximize the dynamic aperture (DA) of a ring. Given the number of adjustable parameters and the compute-intensity of DA simulations, this task can benefit significantly from efficient search algorithms of the available parameter space. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 1923-1926
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1923-1926
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4.
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Monte Carlo Driven MDI Optimization at a Muon Collider
/ Curatolo, Camilla (INFN, Padua ; Padua U.) ; Collamati, Francesco (INFN, Rome) ; Lucchesi, Donatella (INFN, Padua ; Padua U.) ; Mereghetti, Alessio (CERN ; CNAO, Milan) ; Mokhov, Nikolai (Fermilab) ; Palmer, Mark (Brookhaven) ; Sala, Paola (INFN, Milan)
A Muon Collider represents a very interesting possibility for a future machine to explore the energy frontier in particle physics. However, to reach the needed luminosity, beam intensities of the order of 10⁹–10¹² muons per bunch are needed. [...]
FERMILAB-CONF-21-788-AD.-
JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 3769-3772
Fulltext: jt - PDF; document - PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3769-3772
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5.
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Release of Crystal Routine for Multi-Turn Proton Simulations within SixTrack v5
/ D'Andrea, Marco (CERN) ; Mereghetti, Alessio (CERN) ; Mirarchi, Daniele (CERN) ; Olsen, Veronica (CERN) ; Redaelli, Stefano (CERN)
Crystal collimation is studied as a possible scheme to further improve the efficiency of ion collimation at the High Luminosity Large Hadron Collider (HL-LHC), as well as for possible applications in the CERN program of Physics Beyond Colliders. This concept relies on the use of bent crystals that can deflect high-energy halo particles at large angles, of the order of tens of urad. [...]
2021 - 4 p.
- Published in : 10.18429/JACoW-IPAC2021-WEPAB024
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, Br, 24 - 28 May 2021, pp.2648-2651
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6.
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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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7.
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A Flexible Tool for Beam Induced Background Simulations at a Muon Collider
/ Collamati, Francesco (INFN, Rome) ; Aimè, Chiara (INFN, Pavia ; Pavia U.) ; Andreetto, Paolo (INFN, Padua ; Padua U.) ; Bartosik, Nazar (INFN, Turin) ; Buonincontri, Laura (INFN, Padua ; Padua U.) ; Casarsa, Massimo (INFN, Trieste) ; Curatolo, Camilla (INFN, Padua ; Padua U.) ; Gianelle, Alessio (INFN, Padua ; Padua U.) ; Lucchesi, Donatella (INFN, Padua ; Padua U.) ; Mereghetti, Alessio (CERN ; CNAO, Milan) et al.
A Muon Collider represents a very interesting possibility for a future machine to explore the energy frontier in particle physics.However, to reach the needed luminosity, beam intensities of the order of $10^{9-11}$ muons per bunch are needed. In this context, the Beam Induced Background must be taken into account for its effects on the magnets and on the detector. [...]
SISSA, 2021 - 6 p.
- Published in : PoS ICHEP2020 (2021) 684
Fulltext: PDF;
In : 40th International Conference on High Energy Physics (ICHEP), Prague, Czech Republic, 28 Jul - 6 Aug 2020, pp.684
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9.
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MD2193 – Impedance Measurements of the TCSPM Prototype Collimator
/ Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Arsenyev, Sergey ; Azzopardi, Gabriella (CERN) ; Biancacci, Nicolo (CERN) ; Bruce, Roderik (CERN) ; Carver, Lee Robert (University of Liverpool (GB)) ; Fitterer, Miriam ; Giordano, Francesco (Universita e sezione INFN di Napoli (IT)) ; Lamas Garcia, Inigo et al.
In view of the HL–LHC project, it is planned to exchange 9 out 11 of the LHC secondary collimators in IR7, made of graphite, with low–impedance ones. [...]
CERN-ACC-NOTE-2021-0021.
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2021. - 17 p.
Full text
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10.
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MD2191 – β∗–Reach: 2017 IR7 Collimation Hierarchy Limit and Impedance
/ Mereghetti, Alessio ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Azzopardi, Gabriella (CERN) ; Carver, Lee Robert (University of Liverpool (GB)) ; Metral, Elias (CERN) ; Redaelli, Stefano (CERN) ; Salvant, Benoit (CERN) ; Valentino, Gianluca (University of Malta (MT)) ; Valuch, Daniel (CERN)
This report summarises the results of MD2191 about the hierarchy limit of the LHC collimation system in IR7 at 6.5 TeV and its impedance. [...]
CERN-ACC-NOTE-2021-0020.
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2021. - 19 p.
Full text
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