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ATS Notes

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2026-01-22
16:18
Study of longitudinal beam instabilities at transition crossing in the CERN Proton Synchrotron / Salinas, Julia Eva (Centrale Supelec (FR)) ; Lasheen, Alexandre (CERN)
The Proton Synchrotron (PS) faces beam stability challenges when crossing transi- tion energy, where longitudinal microwave instabilities can lead to rapid emittance blow-up and beam loss. [...]
CERN-ACC-NOTE-2026-0001. - 2026

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2025-12-19
15:40
Specific Requirements and Challenges in Operation due to Switching between Therapy and Research Operation Modes for a Next Ion Medical Machine / Grubling, Peter (Foundation Tera-Care (CH)) ; Garolfi, Luca
A comprehensive and detailed definition of the requirements specification, knowledge and analysis of the foreseeable use cases, use general and case related safety requirements and consideration of technical feasibility are indispensable prerequisites for the development and manufacture of a research or production device. [...]
CERN-ACC-NOTE-2025-0022 ; NIMMS-Note-0026. - 2025 - 35.
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2025-12-12
16:58
DESIGN OF A SUPERFERRIC DIPOLE FOR HELICS / Korchevnyuk, Vera ; Bottura, Luca (CERN)
This report presents the design of a superferric dipole magnet for the Helium Light Ion Compact Synchrotron (HeLICS) [...]
CERN-ACC-NOTE-2025-0021. - 2025
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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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LHC MD Notes (185)