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LHC MD Notes

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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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2023-11-06
09:16
MD6864 — Decapole studies at injection / Le Garrec, Mael (Goethe University Frankfurt (DE)) ; Carlier, Felix Simon (CERN) ; Dilly, Joschua Werner (CERN) ; Ferrentino, Vittorio (Universita di Napoli Federico II (IT)) ; Maclean, Ewen Hamish (CERN) ; Paraschou, Konstantinos (CERN) ; Tomas Garcia, Rogelio (CERN)
Chromaticity and amplitude detuning measurements were performed in the past at injection. [...]
CERN-ACC-NOTE-2023-0018. - 2023.
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2023-09-19
09:52
Chromaticity measurement using the beam transfer function (MD 6803) / Buffat, Xavier (CERN) ; Giacomel, Lorenzo (CERN) ; Mounet, Nicolas (CERN) ; Soderen, Martin
Chromaticity measurement at the LHC is based on energy modulation which is incompatible with high intensity beam operation. [...]
CERN-ACC-NOTE-2023-0014. - 2023. - 10 p.
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2023-04-24
12:04
Machine Configuration for the 2023 Proton Run (MD7003) / Fartoukh, Stephane (CERN) ; Dilly, Joschua Werner (CERN) ; Hostettler, Michi (CERN) ; Iadarola, Giovanni (CERN) ; Jacquet, Delphine (CERN) ; Kostoglou, Sofia (CERN) ; Mirarchi, Daniele (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Sterbini, Guido (CERN) et al.
This note contains a condensed summary of the various beam tests which took place in 2022 in order to validate the machine configuration planned to be deployed for the 2023 proton run of the LHC, including in particular a combined ramp and anti-telescopic squeeze, the rotation of the external crossing angle in LHCb, and beam operation with up to 1.8 × 1011 p/b..
CERN-ACC-NOTE-2023-0005. - 2023.
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2023-04-11
15:01
Amplitude Detuning from Nonlinear-Corrector- and Triplet-Misalignments at flat-orbit in the LHC and HL-LHC / Dilly, Joschua Werner (CERN) ; Maclean, Ewen Hamish (CERN) ; Tomas Garcia, Rogelio (CERN)
Feed-down effects from high-order magnetic fields can have a detrimental impact on beam stability and lifetime in the LHC. [...]
CERN-ACC-NOTE-2022-0078. - 2022.
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2023-04-11
11:10
Determination of BLM conversion factors for collimators scans / Gorzawski, Arkadiusz (ESS - European Spallation Source (SE)) ; Giovannozzi, Massimo (CERN)
This note summarises the results of a study related to a method used to obtain the conversion factor to calibrate in protons/s the signals measured in Gy/s by the BLM system during the collimator scans. [...]
CERN-ACC-NOTE-2022-0077. - 2022. - 9 p.
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2023-01-27
14:13
The Effect of Ground Motion on the LHC and HL-LHC Beam Orbit / Schaumann, Michaela ; Gamba, Davide (CERN) ; Garcia Morales, Hector ; Corsini, Roberto (CERN) ; Guinchard, Michael (CERN) ; Scislo, Lukasz Grzegorz (Tadeusz Kosciuszko Cracow University of technology (PL)) ; Wenninger, Jorg (CERN)
The High Luminosity Large Hadron Collider (HL--LHC) will require unprecedented orbit stability at the low-beta experiments, ATLAS and CMS. [...]
CERN-ACC-NOTE-2022-0076. - 2023. - 13 p.
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