CERN Accelerating science

Accelerator Physics

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General mitigation techniques for coherent beam instabilities in particle accelerators / Métral, Elias (CERN)
An important number of coherent beam instability mechanisms can be observed in a particle accelerator, depending if the latter is linear or circular, operated at low, medium or high energy, with a small or a huge amount of turns (for circular machines), close to transition energy or not (below or above), with only one bunch or many bunches, with counter-rotating beams (such as in colliders) or not, if the beam is positively or negatively charged, if one is interested in the longitudinal plane or in the transverse plane, in the presence of linear coupling between the transverse planes or not, in the presence of nonlinearities or not, in the presence of noise or not, etc. Building a realistic impedance model of a machine is a necessary step to be able to evaluate the machine performance limitations, identify the main contributors in case an impedance reduction is required, and study the interaction with other mechanisms such as optics (linear and nonlinear), RF gymnastics, transverse damper, noise, space charge, electron cloud, and beam–beam (in a collider). [...]
2021 - 23 p. - Published in : Eur. Phys. J. Plus 137 (2022) 47 Fulltext: PDF;

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Numerical noise due to binning in macroparticle simulations / Lasheen, Alexandre (CERN)
Numerical noise is an important parameter to minimize to ensure convergence of the macroparticle simulation results. [...]
- 2021. - 15 p.

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Challenging the Standard Model by high precision comparisons of the fundamental properties of antiprotons and protons / Borchert, Matthias Joachim
This thesis describes high precision measurements on the fundamental properties of the antiproton, namely the charge-to-mass ratio and the magnetic moment [...]
CERN-THESIS-2021-230 - Hannover : Gottfried Wilhelm Leibniz Universität, 2021-12-14.

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Chapter 3: Design of the East Area facility after renovation / Bernhard, Johannes Benedikt (CERN) ; Dogru, G (CERN) ; Evrard, S (CERN) ; Froeschl, Robert (CERN) ; Harrouch, E (CERN) ; Lazzaroni, M (CERN)
The PS primary proton beam is slowly extracted at 24 GeV/c towards the East Area with the help of the third- order resonance technique over a typical spill length of 350 to 450 ns within 2.4 s cycles. The number of East Area extractions is usually around five to six per overall PS super-cycle of typically 40 s and depends on both users and schedule constraints, respectively. [...]
2021 - 26 p. Fulltext: PDF;
In : CERN Proton Synchrotron East Area Facility, pp.17-42

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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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