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ATS Notes

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2025-10-07
16:20
RF Measurement and Tuning of the Linac4 Spare RFQ / Millar, Lee (CERN) ; Grudiev, Alexej (CERN)
The first radio-frequency (RF) accelerating structure in Linac4 is a 352.2 MHz, three-metre-long radio-frequency quadrupole (RFQ) that bunches and accelerates the 45 keV H- beam from the ion source to an energy of 3 MeV. [...]
CERN-ACC-NOTE-2025-0020. - 2025 - 86.
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2025-09-26
15:15
Chamonix Workshop 2025 Summary / Carra, Federico (CERN) ; Charitonidis, Nikolaos (CERN) ; Papotti, Giulia (CERN) ; Sterbini, Guido (CERN)
The Chamonix Workshop 2025 took place from 27 to 30 January 2025 in the "Majestic" conference centre in Chamonix. [...]
CERN-ACC-NOTE-2025-0019. - 2025 - 68.
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2025-09-16
10:14
Cable Transfer Function Measurements and Bunch Length Analysis in the SPS / Flowerdew, Jake ; Intelisano, Leandro ; Lasheen, Alexandre (CERN) ; Papotti, Giulia (CERN)
This note details the cable transfer function measurements taken in 2024 and 2025 for the longitudinal beam observation system in the SPS. [...]
CERN-ACC-NOTE-2025-0018. - 2025 - 15.
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2025-09-04
11:10
An Interferometric Multi-Sensor Absolute Distance Measurement System for Use in Harsh Environments / Sosin, Mateusz (CERN) ; Gonzalez Cobas, Juan David (CERN) ; Mohammed, Isa (Nottingham U.) ; Leach, Richard (Nottingham U.) ; Lipinski, Maciej Marek (CERN) ; Rude, Vivien (CERN) ; Rutkowski, Jaroslaw Marek ; Watrelot, Leonard
Fourier transform-based frequency sweeping interferometry (FT-FSI) is an interferometric technique that enables absolute distance measurement by detecting the beat frequencies from the interference of reflected signals. [...]
CERN-ACC-NOTE-2025-0017. - 2025 - 33.

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2025-08-13
16:28
Margin on the FMCM Threshold for the MBS in TT66 / Lannoy, Christophe ; Wollmann, Daniel (CERN)
On 1st April 2025, voltage ripples at the output of the MBS dipoles’ power converter in TT66 inhibited beam extraction to HiRadMat. [...]
CERN-ACC-NOTE-2025-0016. - 2025 - 14.
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2025-07-29
09:13
SPS-Scraper Longitudinal Impedance Simulation and Measurement Report / Bursali, Hikmet (CERN) ; De La Fuente Garcia, Elena (Universidad Politecnica de Madrid (ES)) ; Salvant, Benoit (CERN) ; Vollinger, Christine (CERN)
This report presents the longitudinal impedance mitigation study of the 4th version of SPS Transverse Beam Scraper [...]
CERN-ACC-NOTE-2025-0015. - 2025
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2025-07-24
15:39
LGC open-source: A strategy to share adjustment software and algorithmic development / Kautzmann, Guillaume (CERN) ; Gutekunst, Juergen (CERN) ; Klumb, Francis (CERN) ; Elson, Philip (CERN)
LGC (Logiciel Général de Compensation) is a software that computes position estimates and associated statistics based on observations obtained by CERN surveyors. [...]
CERN-ACC-NOTE-2024-0038. - 2024 - 6.
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2025-07-24
15:34
Alignment strategy for the High-Luminosity Large Hadron Collider / Mainaud Durand, Helene (CERN) ; Barbarroux, Vincent Thomas (CERN) ; Behrens, Antje (CERN) ; Bestmann, Patrick (CERN) ; Fuchs, Jean-Frederic (CERN) ; Gayde, Jean-Christophe (CERN) ; Kautzmann, Guillaume (CERN) ; Klumb, Francis (CERN) ; Mergelkuhl, Dirk (CERN) ; Naegely, Anne-Valerie (CERN) et al.
The High Luminosity Large Hadron Collider (HL-LHC) project is an upgrade of the LHC to enable continuous operation at luminosities which are a factor of five above the LHC design value. [...]
CERN-ACC-NOTE-2024-0037. - 2024 - 6.
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2025-07-24
15:29
Development of a new levelling process integrated into a 3D global calculation / Fuchs, Jean-Frederic (CERN) ; Segers, Jean-Francois ; Vendeuvre, Camille (CERN)
CERN surveyors have traditionally used the 2D + 1 method for beamline smoothing, where computing the planimetric (XY) and altimetric (H) data performed independently and separately. [...]
CERN-ACC-NOTE-2024-0036. - 2024 - 7.
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2025-07-24
15:18
Alignment system tests on the CERN remote alignment system mock-up / Sosin, Mateusz (CERN) ; Barbarroux, Vincent Thomas (CERN) ; Biedrawa, Piotr ; Calmels, Julia Anna Jeanne ; Dandekar, Mamta Shrikrishna ; Falcao Machado, Joao Luis ; Fernandez Bautista, Roberto (CERN) ; Herty, Andreas (CERN) ; Kampp, Jonas ; Jasonek, Wojciech (AGH University of Krakow (PL)) et al.
The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) aims to enable continuous operation at luminosities which are a factor of five above the LHC design value. [...]
CERN-ACC-NOTE-2024-0035. - 2024 - 8.
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LHC MD Notes (185)