CERN Accelerating science

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2024-11-13
02:50
Impact of beam-beam effects and linear coupling resonance on the absolute luminosity calibration at the CERN Large Hadron Collider / Zhang, Chenying (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Zhang, Chenying (Imperial College London)
In colliders such as the CERN Large Hadron Collider (LHC), luminosity represents the ratio between the event rate at a particle detector and the cross section of the particle physics event being measured. Uncertainties in the luminosity directly propagate to uncertainties in the cross section of the event. [...]
CERN-THESIS-2024-227.- 60 p. Fulltext: PDF; External link: Approve this document (restricted)

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2024-11-06
14:12
Future Ions in the CERN Accelerator Complex WG: Post-LS3 NA61/SHINE light ion beam requirements feasibility study: source operation, radiation protection impact in LINAC 3, LEIR and PS and risk assessment in LEIR / Alemany Fernandez, Reyes (CERN) ; Chapuis, Didier (CERN) ; Kuchler, Detlef (CERN) ; Lang, Thibaut Michael (CERN) ; Morand, Boris (CERN) ; Slupecki, Maciej (CERN) ; Widorski, Markus (CERN)
The NA61/SHINE experiment is approved until Long Shutdown 3. [...]
CERN-ACC-NOTE-2024-0020.
- 2024
Full text

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2024-10-31
12:12
The Universe in a Cake! A Dark Matter Cake Recipe & Explainer / Leney, Katharine (Southern Methodist University (US))
This handout includes a cake recipe and an explainer about the composition of the universe — covering visible matter, dark matter, and dark energy. [...]
ATLAS-OUTREACH-2024-026.
- 2024 - 3.
Language: English

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2024-10-31
06:04
High voltage consolidation of the temperature measurement channels of the LHC superconducting current leads / Trikoupis, N (CERN) ; Casas-Cubillos, J (CERN) ; Bustamante, E (CERN)
Recurrent dielectric breakdowns on the cryogenics instrumentation during the CERN LHC Electrical Quality Assurance (ELQA) campaigns led to an investigation of their root causes. During the CERN Long Shutdown 2 (LS2), several weaknesses were identified like floating wires or cable screens, cabling non-conformities, connector assembly issues, and weakness of the electronic conditioning cards. [...]
2023 - 8 p. - Published in : JINST 18 (2023) C02010
In : Topical Workshop on Electronics for Particle Physics 2022 (TWEPP 2022), Bergen, Norway, 19 - 23 Sep 2022, pp.C02010

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2024-10-30
15:31
LHC Availability Report 2023 / Felsberger, Lukas (CERN) ; Asko, Anti (CERN) ; Heron, Jack (CERN) ; Hostettler, Michi (CERN) ; Mikulec, Bettina (CERN) ; Uythoven, Jan (CERN) ; Wollmann, Daniel (CERN)
This document summarises the LHC availability during 2023 and compares it to previous years. [...]
CERN-ACC-NOTE-2024-0019.
- 2024 - 22.
Full text

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2024-10-18
06:28
Reliability run and data analysis of the accelerated aging of present and future electrolytic capacitors installed in the protection systems of superconducting magnets of the Large Hadron Collider at CERN / Guasch-Martínez, J (CERN) ; Carrillo, D (CERN) ; de Nicolás, E (CERN) ; Bjorkhaug, E (CERN) ; Nowak, E (CERN) ; Pojer, M (CERN) ; Rodríguez-Mateos, F (CERN)
This study evaluates the lifetime and aging process of the aluminium electrolytic capacitors to be used in the new protection systems of the High Luminosity LHC superconducting magnets. The accelerated testing and analysis of several groups of capacitors aged for more than one year provided insights into their expected lifespan and aging process. [...]
2024 - 7 p. - Published in : JINST
Fulltext: PDF;
In : Topical Workshop on Electronics for Particle Physics 2023 (TWEPP 2023), Geremeas, Sardinia, Italy, 1 - 6 Oct 2023, pp.C03003

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2024-10-17
10:48
Improved CERN LHC layout and aperture models / Lampaki, Syrmatenia
Aperture models are of fundamental importance to design machine optics configurations and predict machine performance [...]
CERN-THESIS-2024-195 - Thessaloniki , Greece : Aristotle University of Thessaloniki, 2024-06-21 - 88.


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2024-10-16
09:18
Simulations of incoherent effects driven by electron clouds forming in the inner triplets of the Large Hadron Collider / Paraschou, Konstantinos (CERN) ; Iadarola, Giovanni (CERN) ; Mether, Lotta (CERN)
During Run 2 and Run 3 of the Large Hadron Collider (LHC), slow losses from electron cloud (e-cloud) effects have been systematically observed during the full duration of fills with closely-spaced proton bunches. In particular, these effects had been found to depend strongly on the crossing angle of the two beams and the value of the betatron functions in the interaction points. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) WEPR57 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEPR57

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2024-10-15
13:51
Report from LHC MD 6863: Amplitude Detuning Corrections from Feed-Down / Dilly, Joschua Werner (CERN) ; Le Garrec, Mael (Goethe University Frankfurt (DE)) ; Maclean, Ewen Hamish (CERN) ; Van Riesen-Haupt, Leon (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Tomas Garcia, Rogelio (CERN)
Report of the MD6863 performed on the 24th and 25th of June 2022 to establish new corrections for the dodecapole correctors in LHC IP1 and IP5 to mitigate feed-down effects of high-order errors to amplitude detuning. [...]
CERN-ACC-NOTE-2023-0028.
- 2023 - 13.
Full text

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2024-10-09
15:10
Benchmarking power deposition from fast losses of heavy-ion beams at the onset of LHC Run 3 / Rodin, Volodymyr (CERN) ; Lechner, Anton (CERN) ; Salvachua, Belen (CERN) ; Mirarchi, Daniele (CERN) ; Esposito, Luigi Salvatore (CERN) ; D'Andrea, Marco (CERN) ; Schoofs, Philippe (CERN) ; Bruce, Roderik (CERN) ; Cai, Rongrong (CERN) ; Morales Vigo, Sara (CERN) et al.
In 2023, the LHC started its Run 3 operation with $^{208}\text{PB}^{82+}$ beams at 6.8 ZTeV, with a substantially higher number of bunches compared to past runs. Several new hardware systems were used operationally for the first time with high-intensity beams, including bent crystal collimators in the betatron cleaning insertion. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) TUPS39 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.TUPS39

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High Luminosity Large Hadron Collider (HL-LHC) (1,214)
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