LHC MD 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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2025-04-24
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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2025-04-01
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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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.
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2024-05-15
14:38

LHC MD 6944: RF Voltage Calibration / Karlsen-Baeck, Birk Emil (Sapienza Universita e INFN, Roma I (IT)) ; Argyropoulos, Theodoros (CERN) ; Calaga, Rama (CERN) ; Damerau, Heiko (CERN) ; Dlugosz, Dominika Agnieszka ; Karpov, Ivan (CERN) ; Timko, Helga (CERN)
This note summarizes the procedure and results from the MD on beam-based voltage calibration of the RF system. [...]
CERN-ACC-NOTE-2024-0008. - 2024. - 24 p.
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2024-04-11
11:49

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. [...]
CERN-ACC-NOTE-2024-0007. - 2024.
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2024-04-11
11:49

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. [...]
CERN-ACC-NOTE-2024-0006. - 2024.
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2024-02-15
11:55

LHC MD 6945: Injection Power Transients / Karlsen-Baeck, Birk Emil (Sapienza Universita e INFN, Roma I (IT)) ; Argyropoulos, Theodoros (CERN) ; Butterworth, Andy (CERN) ; Calaga, Rama (CERN) ; Damerau, Heiko (CERN) ; Dlugosz, Dominika Agnieszka ; Karpov, Ivan (CERN) ; Timko, Helga (CERN) ; Zampetakis, Michail (CERN)
This note summarizes the procedure and results from the RF MD that was performed to study power transients and klystron saturation at injection. [...]
CERN-ACC-NOTE-2024-0002. - 2024. - 12 p.
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2023-12-11
11:59

MD 7224: LHC collimation quench test with protons / Hermes, Pascal Dominik (CERN) ; Abramov, Andrey (CERN) ; Bruce, Roderik (CERN) ; Calzolari, Daniele (Universita e INFN, Padova (IT)) ; D'Andrea, Marco (CERN) ; Giovannozzi, Massimo (CERN) ; Hernalsteens, Cedric (CERN) ; Lechner, Anton (CERN) ; Lindstrom, Bjorn Hans Filip (CERN) ; Mirarchi, Daniele (CERN) et al.
This note describes a collimation quench test performed at the CERN Large Hadron Collider. [...]
CERN-ACC-NOTE-2023-0024. - 2023.

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