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Interpretable Anomaly Detection in the LHC Main Dipole Circuits With Nonnegative Matrix Factorization
/ Obermair, Christoph (CERN ; Graz, Tech. U.) ; Apollonio, Andrea (CERN) ; Charifoulline, Zinour (CERN) ; Felsberger, Lukas (CERN) ; Janitschke, Marvin (CERN ; U. Rostock) ; Pernkopf, Franz (Graz, Tech. U.) ; Ravaioli, Emmanuele (CERN) ; Verweij, Arjan (CERN) ; Wollmann, Daniel (CERN) ; Wozniak, Mariusz (CERN)
CERN's Large Hadron Collider (LHC), with its eight superconducting main dipole circuits, has been in operation for over a decade. During this time, relevant operational parameters of the circuits, including circuit current, voltages across magnets and their coils, and current to ground, have been recorded. [...]
2024 - 12 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4004112
Fulltext: PDF;
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2.
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Reliability studies for CERN’s new safe machine parameter system
/ Blaszkiewicz, Milosz (CERN) ; Apollonio, Andrea (CERN) ; Bolton, Samuel (CERN) ; Colinet, Antoine (CERN) ; Romera, Iván (CERN) ; Secondo, Raffaello (CERN) ; Uythoven, Jan (CERN) ; Wollmann, Daniel (CERN) ; Felsberger, Lukas (CERN)
The Safe Machine Parameter system (SMP) is a critical part of the machine protection system in CERN’s Large Hadron Collider (LHC) and the Super Proton Synchrotron (SPS). It broadcasts safety-critical parameters like beam energy, beam intensity, the beta functions and flags indicating safety levels of the beam to other machine protection elements. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) THPA057
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPA057
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3.
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4.
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Implications and Mitigation of Radiation Effects on the CERN SPS Operation during 2021
/ Aguiar, Ygor (CERN) ; Apollonio, Andrea (CERN) ; Biłko, Kacper (CERN) ; Brucoli, Matteo (CERN) ; Cecchetto, Matteo (CERN) ; Danzeca, Salvatore (CERN) ; García Alía, Ruben (CERN) ; Ladzinski, Tomasz (CERN) ; Lerner, Giuseppe (CERN) ; Potoine, Jean-Baptiste (CERN) et al.
During the Long Shutdown 2 (LS2, 2019-2020), the CERN accelerator complex has undergone major upgrades, mainly in preparation for the High-Luminosity (HL) LHC era, the ultimate capacity for its physics production. Therefore, several novel equipment and systems were designed and deployed throughout the accelerator complex. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 740-743
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.740-743
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5.
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Data Augmentation for Breakdown Prediction in CLIC RF Cavities
/ Bovbjerg, Holger (CERN ; Aalborg U.) ; Apollonio, Andrea (CERN) ; Cartier-Michaud, Thomas (CERN) ; Millar, William (CERN) ; Obermair, Christoph (CERN ; Graz, Tech. U.) ; Shen, Ming (CERN ; Aalborg U.) ; Tan, Zheng-Hua (CERN ; Aalborg U.) ; Wollmann, Daniel (CERN)
One of the primary limitations on the achievable accelerating gradient in normal-conducting accelerator cavities is the occurrence of vacuum arcs, also known as RF breakdowns. A recent study on experimental data from the CLIC XBOX2 test stand at CERN proposes the use of supervised machine learning methods for predicting RF breakdowns. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 1553-1556
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1553-1556
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6.
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Reliability Analysis of the HL-LHC Energy Extraction System
/ Blaszkiewicz, Milosz (CERN) ; Apollonio, Andrea (CERN) ; Cartier-Michaud, Thomas (CERN) ; Panev, Bozhidar Ivanov (CERN) ; Pojer, Mirko (CERN) ; Wollmann, Daniel (CERN)
The energy extraction systems for the protection of the new HL-LHC superconducting magnet circuits are based on vacuum breakers. This technology allows to significantly reduce the switch opening time and increases the overall system reliability with reduced maintenance needs. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 747-750
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.747-750
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7.
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Summary of the Post-Long Shutdown 2 LHC Hardware Commissioning Campaign
/ Apollonio, Andrea (CERN) ; Andreassen, Odd (CERN) ; Antoine, Alain (CERN) ; Argyropoulos, Theodoros (CERN) ; Bastos, Miguel (CERN) ; Bednarek, Mateusz (CERN) ; Bordini, Bernardo (CERN) ; Brodzinski, Krzysztof (CERN) ; Calia, Andrea (CERN) ; Charifoulline, Zinour (CERN) et al.
In this contribution we provide a summary of the LHC hardware commissioning campaign following the second CERN Long Shutdown (LS2), initially targeting the nominal LHC energy of 7 TeV. A summary of the test procedures and tools used for testing the LHC superconducting circuits is given, together with statistics on the successful test execution. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 335-338
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.335-338
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8.
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The MYRRHA Project
/ Podlech, Holger (Goethe U., Frankfurt, IAP) ; Abs, Michel (IBA, Louvain-la-Neuve) ; Angulo, Carmen (SCK-CEN, Mol) ; Apollonio, Andrea (CERN) ; Bechtold, Alexander (NTG, Gelnhausen - Hailer) ; Belmans, Jorik (SCK-CEN, Mol) ; Biarrotte, Jean-Luc (IJCLab, Orsay) ; Bouly, Frédéric (LPSC, Grenoble) ; Brison, Jeremy (IBA, Louvain-la-Neuve) ; Britten, Philipp (Goethe U., Frankfurt, IAP) et al.
The main objective of the MYRRHA project at SCK•CEN, the Belgian Nuclear Research Centre, is to demonstrate the feasibility of nuclear waste transmutation using an Accelerator Driven System (ADS). It is based on a High Power CW operated 600 MeV proton Linac with an average beam power of 2.4 MW. [...]
2020 - 6 p.
- Published in : 10.18429/JACoW-NAPAC2019-THZBA2
Fulltext: PDF;
In : 3rd North American Particle Accelerator Conference (NAPAC), Lansing, MI, USA, 2 - 6 Sep 2019, pp.945-950
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9.
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Availability Modeling of the Solid-State Power Amplifiers for the CERN SPS RF Upgrade
/ Felsberger, Lukas (CERN) ; Apollonio, Andrea (CERN) ; Cartier-Michaud, Thomas (CERN) ; Montesinos, Eric (CERN) ; Oliveira, Joao Carlos (CERN) ; Uythoven, Jan (CERN)
As part of the LHC Injector Upgrade program a complete overhaul of the Super Proton Synchrotron Radio-Frequency (RF) system took place. New cavities have been installed for which the solid-state technology was chosen to deliver a combined RF power of 2 MW from 2560 RF amplifiers. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 2308-2311
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.2308-2311
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10.
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Data-Driven Risk Matrices for CERN’s Accelerators
/ Cartier-Michaud, Thomas (CERN) ; Apollonio, Andrea (CERN) ; Blarasin, Gennaro (CERN) ; Todd, Benjamin (CERN) ; Uythoven, Jan (CERN)
A risk matrix is a common tool used in risk assessment, defining risk levels with respect to the severity and probability of the occurrence of an undesired event. Risk levels can then be used for different purposes, e.g. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 2260-2263
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.2260-2263
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