CERN Accelerating science


Corrections of high-order nonlinearities in the LHC and High-Luminosity LHC beam optics / Dilly, Joschua Werner (CERN)
The impact of high-order nonlinear magnetic field errors on the performance of the Large Hadron Collider (LHC) and its planned High-Luminosity upgrade, the HL-LHC, has been extensively studied. Particularly, the presence of such errors in the Insertion Regions (IR) has shown significant repercussions due to the high beta-functions and feed-down to lower orders caused by crossing schemes. [...]
CERN-THESIS-2023-382; DOI:10.18452/28273.- Berlin : Humboldt-Universität zu Berlin, 2024-03-01 - 233 p. Fulltext: PDF; External link: Approve this document (restricted)

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Effects of cavity pre-detuning on RF power transients at injection into the LHC / Karlsen-Baeck, B E (CERN ; Rome U.) ; Argyropoulos, T (CERN) ; Butterworth, A (CERN) ; Calaga, R (CERN) ; Karpov, I (CERN) ; Timko, H (CERN) ; Zampetakis, M (CERN)
At injection into the Large Hadron Collider (LHC), the radiofrequency (RF) system is perturbed by beam-induced voltage resultingin strong RF power transients and the instant detuning of thecavities. The automatic tuning system, however, needs time for themechanical compensation of the resonance frequency to takeplace. [...]
2024 - 8 p. - Published in : JINST 19 (2024) T04005 Fulltext: PDF;
In : 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.T04005

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Measurement of emittance growth and oscillation spectrum for different damper gains (MD 9407) / Buffat, Xavier (CERN) ; Fornara, Andrea (University of Manchester (GB)) ; Giacomel, Lorenzo (CERN) ; Kostoglou, Sofia (CERN) ; Lannoy, Christophe (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Mounet, Nicolas (CERN) ; Radoslavova, Anna Valeri (Heidelberg University (DE)) ; Sterbini, Guido (CERN) ; Valuch, Daniel (CERN)
The procedure of an experiment aiming at studying the impact of the transverse damper gain on the beam oscillation spectrum and on the emittance growth of colliding beams is described along with the corresponding results. [...]
- 2024.
Full text

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Octupole threshold with trains of bunches (MD 9403) / Buffat, Xavier (CERN) ; Giacomel, Lorenzo (CERN) ; Rumolo, Giovanni (CERN) ; Mether, Lotta (CERN) ; Mounet, Nicolas (CERN) ; Paraschou, Konstantinos (CERN)
We describe an experiment aiming at determining the stability threshold in terms of octupole current for bunch trains at flat top in the LHC. [...]
- 2024.
Full text

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Impact of beam-coupling impedance on the Schottky spectrum of bunched beam / Lannoy, C (CERN ; LPHE, Lausanne) ; Lasocha, K (CERN) ; Pieloni, T (LPHE, Lausanne) ; Alves, D (CERN) ; Mounet, N (CERN)
The Schottky monitors of the Large Hadron Collider (LHC) canbe used for non-invasive beam diagnostics to estimate various bunchcharacteristics, such as tune, chromaticity, bunch profile orsynchrotron frequency distribution. However, collective effects, inparticular beam-coupling impedance, can significantly affectSchottky spectra when large bunch charges are involved. [...]
2024 - 21 p. - Published in : JINST 19 (2024) P03017 Fulltext: PDF;
In : 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.P03017

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Radiological Characterization with a Fluence Conversion Coefficients–Based Method: A Practical Example of the Preparatory Studies to the Pilot Beam at the CERN Large Hadron Collider / Bozzato, Davide (CERN) ; Froeschl, Robert (CERN)
At high-energy accelerator facilities like the ones that are part of the accelerator complex at the European Organization for Nuclear Research (CERN), Monte Carlo radiation transport codes are widely employed to face the challenges of estimating radionuclide production yields and activities with the aim of performing the radiological characterization of activated components. Indeed, it is of paramount importance to ensure adequate radiation protection during scheduled maintenance, transport, and handling of these components and to establish their proper disposal pathway once they ultimately reach the end of their useful life. [...]
2023 - 11 p. - Published in : Nucl. Sci. Eng. 198 (2023) 486-496
In : 14th International Conference on Radiation Shielding & 21st Topical Meeting of the Radiation Protection and Shielding Division, Seattle, WA, USA, 25 - 29 Sep 2022, pp.486-496

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Design and Metrological Characterization of a Digitizer for the Highest Precision Magnet Powering in the High Luminosity Large Hadron Collider / Beev, Nikolai (CERN ; Bratislava, Slovak Tech. U.) ; Cerqueira Bastos, Miguel (CERN) ; Martino, Michele (CERN) ; Valuch, Daniel (Bratislava, Slovak Tech. U. ; CERN) ; Palafox, Luis (Braunschweig, Phys. Tech. Bund.) ; Behr, Ralf (Braunschweig, Phys. Tech. Bund.)
A new digitizer, the HPM7177, which is a fundamental component of the signal chain for high precision measurement of particle accelerator magnet currents, is presented. It was designed to meet the unprecedented performance requirements for new 14 kA and 18 kA power converters (PCs) for the High Luminosity Large Hadron Collider (HL-LHC) project at CERN, particularly in terms of low-frequency noise and stability. [...]
2024 - 10 p. - Published in : IEEE Trans. Instrum. Meas. 73 (2024) 6501710

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Book cover The High Luminosity Large Hadron Collider : new machine for illuminating the mysteries of the universe / Brüning, Oliver ; Rossi, Lucio (ed.)
This book introduces the physics and technology of the High-Luminosity Large Hadron Collider (LHC), highlighting the most recent modifications that shaped the final configuration, which is now in the advanced stages of its construction [...]
World Scientific, 2024. - 656 p. (Advanced series on directions in high energy physics ; 31)


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A Combined Testing and Modelling Methodology for the Mechanics of High-Field Superconducting Magnets / Bertarelli, Alessandro (CERN) ; Guinchard, Michael (CERN) ; Holko, Michal (CERN) ; Lackner, Friedrich (CERN) ; Masci, Marco (CERN) ; de Frutos, Oscar Sacristan (CERN) ; Savary, Frédéric (CERN) ; Wolf, Felix (CERN)
The use of superconducting composite cables based on Nb3Sn, an intermetallic compound of Niobium and Tin, is one of the favorite routes to reach magnetic fields higher than 10 T in state-of-the-art accelerator magnets. The brittle and nonlinear nature of the epoxy-impregnated Nb3Sn Rutherford cable makes challenging to predict its mechanical limits and, consequently, the overall performance of the magnet. [...]
2024 - 11 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 1-11 Fulltext: PDF;

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Towards MQXFB Series Coils / Lusa, Nicholas (CERN) ; Devred, Arnaud (CERN) ; Ferradas Troitino, José (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Milanese, Attilio (CERN) ; Quassolo, Penelope Matilde (CERN) ; Straarup, Simon (CERN) ; Todesco, Ezio (CERN)
The cold powering test of the first two MQXFB prototype quadrupoles, the Nb$_3$Sn inner triplet magnets to be installed in the HL-LHC, has found performance limitations. This prompted putting on hold the coil fabrication, to review in depth the full manufacturing process, while in parallel performing destructive inspections on selected coils. [...]
2024 - 8 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4003408

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High Luminosity Large Hadron Collider (HL-LHC) (1,163)
HiLumi LHC (264)