CERN Accelerating science

Accelerator Physics

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LHC procedure: excite 3 pilot bunches with AC-dipoles / Malina, Lukas ; Tomas Garcia, Rogelio (CERN)
This note summarises the pre-requisites and steps of optics measurement using AC-dipoles to excite three pilot bunches at beam energy above 4 TeV instead of a single bunch allowed previously for machine protection restrictions..
- 2020. - 2 p.

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Photostimulated desorption performance of the future circular hadron collider beam screen / González, L A (CERN) ; Baglin, V (CERN) ; Chiggiato, P (CERN) ; Garion, C (CERN) ; Kersevan, R (CERN) ; Casalbuoni, S (KIT, Karlsruhe ; European XFEL, Hamburg) ; Grau, A (KIT, Karlsruhe) ; de Jauregui, D Saez (KIT, Karlsruhe) ; Bellafont, I (CELLS - ALBA, LLS) ; Pérez, F (CELLS - ALBA, LLS)
Synchrotron radiation (SR) originated at superconducting bending magnets is known to be at the origin of several beam detrimental effects related to vacuum instabilities. One of the major challenges in the design of the vacuum beam pipes of high-energy hadron colliders is the SR coping strategy. [...]
2021 - 9 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 113201 Fulltext: PDF;

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LHC Configuration and Operational Scenario for Run 3 / Fartoukh, Stephane (CERN) ; Kostoglou, Sofia (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Arduini, Gianluigi (CERN) ; Bartosik, Hannes (CERN) ; Bracco, Chiara (CERN) ; Brodzinski, Krzysztof (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Calviani, Marco (CERN) et al.
After its second successful run period, the Large Hadron Collider (LHC) shut down for three years with the plan of being recommissioned in 2022 for a three-year physics production period, the Run 3. [...]
- 2021. - 33 p.
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Automated Synchrotron Lattice Design and Optimisation Using a Multi-Objective Genetic Algorithm / Zhang, Xuanhao (Melbourne U.) ; Benedetto, Elena (TERA, Novara ; CERN) ; Sheehy, Suzanne (Melbourne U.)
As part of the Next Ion Medical Machine Study (NIMMS), we present a new method for designing synchrotron lattices. A step-wise approach was used to generate random lattice structures from a set of feedforward neural networks. [...]
2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) MOPAB182 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.MOPAB182

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Damage mechanisms in superconductors due to the impact of high energy proton beams and radiation tolerance of cryogenic diodes used in particle accelerator magnet systems / Will, Andreas
High energy hadron accelerators such as the Large Hadron Collider (LHC) at CERN and its planned upgrade to achieve higher luminosity, the High Luminosity Large Hadron Collider (HL-LHC), require superconducting magnets to provide strong magnetic fields, needed to steer and focus the particle beams at [...]
CERN-THESIS-2021-187 DOI:10.5445/IR/1000134497. - Karlsruhe : Karlsruher Institut für Technologie (KIT), 2021-07-02. - 156 p.

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MD 3246: 16L2 UFO dynamics investigations / Lindstrom, Bjorn Hans Filip (CERN) ; Belanger, Philippe (University of British Columbia, CA) ; Vaananen, Mika Petteri (University of Helsinki (FI)) ; Wiesner, Christoph (CERN) ; Wollmann, Daniel (CERN)
Micrometer sized particles (UFOs) entering the beam are a known cause of localized beam losses since the beginning of high intensity beam operations, however the origin of these particles is not fully known. [...]
- 2019. - 8 p.
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Combined-function optics for circular high-energy hadron colliders / Giovannozzi, M. (CERN) ; Todesco, E. (CERN)
The design of future circular high-energy hadron colliders is based on the achievement of challenging magnetic fields, needed to keep the hadron beams orbiting along the ring circumference. [...]

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Beam Instabilities in Circular Particle Accelerators / Metral, Elias (CERN)
The theory of impedance-induced bunched-beam coherent instabilities is reviewed following Laclare's formalism, adding the effect of an electronic damper in the transverse plane. [...]
- 2021.
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The Gamma Factory path to high-luminosity LHC with isoscalar beams / Krasny, M W (Paris U., VI-VII ; CERN) ; Petrenko, A (Novosibirsk, IYF ; CERN) ; Płaczek, W (Jagiellonian U. (main))
There are two main ways to increase LHC luminosity without upgrading CERN injectors: (1) modification of beam-collision optics and (2) reduction of beam transverse emittance. The former is followed in the ongoing high-luminosity upgrade of the LHC (HL-LHC), while the latter, applicable only to ion beams, is described in this contribution [...]
SISSA, 2021 - 6 p. - Published in : PoS ICHEP2020 (2021) 690 Fulltext: PDF;
In : 40th International Conference on High Energy Physics (ICHEP), Prague, Czech Republic, 28 Jul - 6 Aug 2020, pp.690

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Studies of the Energy Recovery Performance of the PERLE Project / André, Kévin (CERN ; Liverpool U.) ; Bogacz, Alex (JLAB, FEL) ; Holzer, Bernhard (CERN)
The Powerful Energy Recovery Linac for Experiments (PERLE) is an accelerator facility for the development and application of the energy recovery technique for an intense 500 MeV electron beam. The paper presents the studies that have been performed to assess the quality of the ERL lattice design and beam optics. [...]
2021 - 4 p. - Published in : 10.18429/JACoW-IPAC2021-WEPAB065 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, Br, 24 - 28 May 2021, pp.WEPAB065

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