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ATS Notes

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2025-04-24
11:01
LHC MD #12263 - Weak-Strong investigation of Long-Range Beam-beam / Persson, Tobias Hakan Bjorn (CERN) ; Buffat, Xavier (CERN) ; Carlier, Felix Simon (CERN) ; Burkhardt, Felix (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Dilly, Joschua Werner (CERN) ; Hostettler, Michi (CERN) ; Kar, Ujani (University of Applied Sciences (DE)) ; Maclean, Ewen Hamish (CERN) ; Tomas Garcia, Rogelio (CERN)
During the intensity ramp-up in 2024, it was revealed that the collimation hierarchy was broken under normal operational conditions with bunch trains. [...]
CERN-ACC-NOTE-2025-0011. - 2025
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2025-04-24
10:54
LHC MD #11883: Optics functions determination using luminosity data / Persson, Tobias Hakan Bjorn (CERN) ; Wanczyk, Joanna
Measuring the betatron waist shift in the Large Hadron Collider (LHC) via conventional k-modulation has proven challenging, motivating the need for alternative techniques. [...]
CERN-ACC-NOTE-2025-0010. - 2025

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2025-04-22
15:54
Direct wire offset measurement by photogrammetry including a gravity link / Barcet, Florian ; Bestmann, Patrick (CERN) ; Mergelkuhl, Dirk (CERN)
This paper presents a novel method for direct wire offset measurements using photogrammetry, with a focus on in- tegrating a link to gravity. [...]
CERN-ACC-NOTE-2024-0028. - 2024 - 7.
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2025-04-15
15:07
Impact of Measured Quadrupole Errors in the New Separation Dipoles on the HL-LHC Optics / Dilly, Joschua Werner (CERN) ; Maclean, Ewen Hamish (CERN) ; Tomas Garcia, Rogelio (CERN)
In this study the impact and correctability of the quadrupole field errors, as measured in the newly fabricated separation dipoles for the low-β∗ insertion regions of the HL-LHC, are evaluated. [...]
CERN-ACC-NOTE-2025-0009. - 2025 - 51.
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2025-04-15
14:54
Impact of Expected Quadrupole Errors in the New Separation Dipoles on the HL-LHC Optics / Dilly, Joschua Werner (CERN) ; Maclean, Ewen Hamish (CERN) ; Tomas Garcia, Rogelio (CERN)
In this study the impact and correctability of the quadrupole field errors, as measured in the newly fabricated separation dipoles for the low-β∗ insertion regions of the HL-LHC, are evaluated. [...]
CERN-ACC-NOTE-2025-0008. - 2025 - 51.
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2025-04-07
15:36
Impactof bunch intensity asymmetry in colliders featuring strong beamstrahlung / Le Nguyen Nguyen, Khoi (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Buffat, Xavier (CERN) ; Kicsiny, Peter ; Pieloni, Tatiana (EPFL - Ecole Polytechnique Federale Lausanne (CH))
An analytical investigation of beamstrahlung induced longitudinal blow-up in Gaussian beams with asymmetric bunch lengths is presented, using approximations for the beam profile. [...]
CERN-ACC-NOTE-2025-0007. - 2025 - 24.

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2025-04-07
11:35
CERN ion injector complex performance during 2024 magnesium test / Slupecki, Maciej (CERN) ; Alemany Fernandez, Reyes (CERN) ; Albright, Simon (CERN) ; Almeida, Dwane (CERN) ; Angoletta, Maria Elena (CERN) ; Argyropoulos, Theodoros (CERN) ; Arrutia, Pablo (CERN) ; Bartosik, Hannes (CERN) ; Baudrenghien, Philippe ; Bellodi, Giulia (CERN) et al.
In the second quarter of 2024 a new ion species, magnesium, has been tested in the CERN's ion injector complex. [...]
CERN-ACC-NOTE-2025-0006. - 2025 - 24.
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2025-04-01
09:28
LHC MD#13523 Measurement of LHC beam intensity dependent transverse tune shifts at injection energy / Wanczyk, Joanna ; Bartosik, Hannes (CERN) ; Buffat, Xavier (CERN) ; Giacomel, Lorenzo ; Hostettler, Michi (CERN) ; Mases Sole, Ingrid (Goethe University Frankfurt (DE)) ; Paraschou, Konstantinos ; Salvant, Benoit (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Trad, Georges (CERN)
Observations of betatron tune evolution during LHC beam injection have revealed a significant tune error, strongly correlated with beam intensity. [...]
CERN-ACC-NOTE-2025-0005. - 2025
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2025-02-28
10:45
Report Accelerator Complex Availability 2024 / Felsberger, Lukas (CERN) ; Alexaki, Paraskevi (National and Kapodistrian University of Athens (GR)) ; Asko, Anti (CERN) ; Charitonidis, Nikolaos (CERN) ; Heron, Jack (CERN) ; Mikulec, Bettina (CERN) ; Rae, Bastien (CERN) ; Uythoven, Jan (CERN) ; Wollmann, Daniel (CERN)
This document summarises the availability of the CERN Accelerator Complex during 2024. [...]
CERN-ACC-NOTE-2025-0003. - 2025
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2025-02-21
14:58
Short Summaries of the ATS Seminars in 2024 / Metral, Elias (CERN) ; Dallocchio, Alessandro (CERN) ; Modena, Michele (CERN) ; Stora, Thierry (CERN)
Five ATS seminars took place in 2024 (https://indico.cern.ch/category/2725/). [...]
CERN-ACC-NOTE-2025-0002. - 2025 - 16.
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LHC MD Notes (184)