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ATS Notes

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2025-05-09
09:44
MD 9543: Failing IR correctors and novel method to find local errors / Persson, Tobias Hakan Bjorn ; Cardona, Javier Fernando (Universidad Nacional de Colombia (CO)) ; Carlier, Felix Simon (CERN) ; Dilly, Joschua Werner (CERN) ; Kar, Ujani (University of Applied Sciences (DE)) ; Maclean, Ewen Hamish (CERN) ; Tomas Garcia, Rogelio (CERN)
This report presents the outcomes of the Machine Development (MD) 9543, focused on strategies to mitigate the effects of failing Interaction Region (IR) correctors and developing novel techniques for identifying local errors in the Large Hadron Collider (LHC). [...]
CERN-ACC-NOTE-2025-0014. - 2025
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2025-04-30
10:54
Simulation of the Crab Cavity/Beam Interaction in the HL-LHC / Mastoridis, Themistoklis (California Polytechnic State Univ. University (US)) ; Loe, Trevor (California Polytechnic State University) ; Baudrenghien, Philippe ; Hagmann, Gregoire (CERN)
The High-Luminosity LHC (HL-LHC) will employ crab cavities to increase luminosity. [...]
CERN-ACC-NOTE-2025-0013. - 2025
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2025-04-28
10:55
FLUKA simulation of the AD target area and transfer line / Niang, Samuel (Swansea University (GB)) ; Esposito, Luigi Salvatore (CERN) ; Dutheil, Yann (CERN)
The Antiproton Decelerator (AD) at CERN is a unique facility dedicated to producing, decelerating, and storing low-energy antiprotons. [...]
CERN-ACC-NOTE-2025-0012. - 2025 - 14.
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2025-04-25
11:40
OPTICS DESIGN OF A COMPACT HELIUM SYNCHROTRON FOR ADVANCED CANCER THERAPY / Huttunen, Heli (University of Helsinki (FI)) ; Asvesta, Foteini (CERN) ; Flier, Gerrit (Universiteit Twente (NL)) ; Bottura, Luca (CERN) ; Prebibaj, Tirsi (CERN) ; Taylor, Rebecca ; Vretenar, Maurizio (CERN) ; Benedetto, Elena (Foundation Tera-Care (CH))
The design of a helium synchrotron for cancer therapy is being studied and optimized in the context of the Next Ion Medical Machine Study (NIMMS) at CERN [...]
CERN-ACC-NOTE-2024-0029 ; NIMMS-Note-024. - 2024 - 4.
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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-$\beta^*$ 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-$\beta^*$ insertion regions of the HL-LHC, are evaluated. [...]
CERN-ACC-NOTE-2025-0008. - 2025 - 45.
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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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LHC MD Notes (185)