CERN Accelerating science

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1.
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;
2.
Validating the Physics-Driven Lumped-Element Model of the LHC Main Dipole Magnet / Janitschke, M (CERN ; U. Rostock) ; Bednarek, M (CERN) ; Ravaioli, E (CERN) ; Verweij, A P (CERN) ; Willering, G (CERN) ; Wozniak, M (CERN) ; van Rienen, U (U. Rostock)
Measuring the complex impedance of a superconducting magnet as a function of frequency provides valuable insight into its electrodynamics. In particular, the characteristic features of some non-conform behaviour, such as an insulation fault, may be easier to assess when performing impedance measurements rather than observing time-domain signals. [...]
2024 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4004405 Fulltext: PDF;
3.
Framework for automatic superconducting magnet model generation & validation against transients measured in LHC magnets / Janitschke, Marvin
Superconducting magnet circuits are a key part of particle accelerators [...]
CERN-THESIS-2022-004 - 134 p.

4.
A Simplified Approach to Simulate Quench Development in a Superconducting Magnet / Janitschke, Marvin (CERN ; Berlin, Tech. U.) ; Mentink, Matthias (CERN) ; Murgia, Federica (CERN ; U. Bologna (main)) ; Pracht, Dimitri (CERN ; QUEST, Hannover) ; Ravaioli, Emmanuele (CERN) ; Verweij, Arjan P (CERN)
Cross-sectional 2D models often represent a computationally efficient alternative to full 3D models, when simulating complex multi-physical magnet systems. However, especially for the case of self-protected, superconducting magnets, where the stored energy has to be dissipated within the magnet coils, the thermal diffusion and the quench development in all three dimensions become key aspects. [...]
2021 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 31 (2021) 4000905 Fulltext: PDF;

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