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Electrical Simulations of the SIS100 Superconducting Dipole and Quadrupole Circuits: Transients, Earthing and Failure Modes
/ Szwangruber, P B (Darmstadt, GSI) ; Raginel, V (Darmstadt, GSI) ; Delkov, D (Ilmenau Tech. U.) ; Ravaioli, E (CERN) ; Plyusnin, V (Darmstadt, GSI) ; Michna, M (Gdansk Tech. U.) ; Wilk, A (Gdansk Tech. U.) ; Wołoszyk, M (Gdansk Tech. U.) ; Freisleben, W (Darmstadt, GSI) ; Dziewiecki, M (Darmstadt, GSI) et al.
The 100 Tm superconducting synchrotron SIS100 is the main accelerator of the international Facility for Antiproton and Ion Research (FAIR) currently under advanced construction in Darmstadt, Germany. The SIS100 dipole circuit which creates the magnetic field required to bend the beam, consists of 108 dipoles distributed over six arc sections of the ring. [...]
2024 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4903805
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Enabling Real-Time Impedance Measurements of Operational Superconducting Circuits of Accelerator Magnets
/ Christensen, M B B (CERN ; Aalborg U.) ; Bednarek, M J (CERN) ; Denz, R (CERN) ; Koch, P (CERN) ; Ludwin, J (CERN ; Cracow, INP) ; Rodriguez-Mateos, F (CERN) ; Podzorny, T (CERN) ; Ravaioli, E (CERN) ; Steckert, J (CERN) ; Verweij, A (CERN) et al.
Impedance measurements of superconducting circuits routinely serve as means to anticipate their dynamic response and validate their electrical integrity. Usual procedures involve performing tests on non-powered systems during commissioning and maintenance periods. [...]
2024 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 1-5
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Validation of the Protection Scheme for the HL-LHC MBRD Magnet by Simulations and Prototype Tests
/ Caiffi, Barbara (INFN, Genoa) ; Bender, Lennard (Hochschule, Eng. Econ., Karlsruhe) ; Bersani, Andrea (INFN, Genoa) ; Bracco, Michela (INFN, Genoa) ; Farinon, Stefania (INFN, Genoa) ; Foussat, Arnaud (CERN) ; Gagno, Andrea (INFN, Genoa) ; Levi, Filippo (INFN, Genoa) ; Mangiarotti, Franco (CERN) ; Ninet, Gaelle (CERN) et al.
The High-Luminosity upgrade of the Large Hadron Collider (LHC) (Todesco et al., 2021) foresees the replacement of the magnets around the interaction points of the ATLAS and CMS experiments at CERN. One of the new magnets is the separation-recombination dipole, also called Main Bending Recombination Dipole (MBRD)(Caiffi et al., 2021), (Levi et al., 2022) in the D2 cryomagnet assembly. [...]
2024 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4001405
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Quench Protection of Fusillo Subscale Curved CCT Magnet
/ Wozniak, M (CERN) ; Haziot, A (CERN) ; Mangiarotti, F J (CERN) ; Ravaioli, E (CERN) ; Ferriere, R (CERN) ; Guardia-Valenzuela, Jorge (CERN) ; Foussat, A P (CERN) ; Kirby, G (CERN) ; Verweij, A (CERN)
The Fusillo project at CERN aims to design and build a demonstrator magnet with multi-harmonic corrected fields in a 90° curved CCT magnet. In the first stage, a subscale magnet is built with 30° bending, about 1/30 of the demonstrator conductor length, and increased current to reach coil stresses equivalent to the demonstrator. [...]
2024 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4702805
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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
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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
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Experimental Program of the HL-LHC Inner Triplet String Test at CERN
/ Yammine, S (CERN) ; Bajko, M (CERN) ; Ballarino, A (CERN) ; Bednarek, M J (CERN) ; Bozzini, D (CERN) ; Blanchard, S (CERN) ; Brüning, O (CERN) ; Cruikshank, P (CERN) ; Denz, R (CERN) ; Ramos, D Duarte (CERN) et al.
This contribution describes the experimental program already undergoing and to be completed on the High Luminosity Large Hadron Collider (HL-LHC) Inner Triplet (IT) String, an important intermediate milestone of the HL-LHC project at CERN. First, it describes the magnet circuits of the HL-LHC IT String. [...]
2024 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4001505
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Simulating Quench Transients in the Self-Protected HL-LHC High Order Corrector Magnets
/ Mayr, D (CERN ; Innsbruck U.) ; Bender, L (Freiburg U.) ; Gautheron, E (CERN) ; Mariotto, S (Milan U.) ; Prioli, M (Milan U.) ; Ravaioli, E (CERN) ; Statera, M (Milan U.) ; Todesco, E (CERN) ; Verweij, A (CERN) ; Wozniak, M (CERN)
—To meet the milestones set by the High-Luminosity LHC (HL-LHC) project, the integration of new inner triplet magnet circuits is vital for enhancing the focusing of the particle beams at ATLAS and CMS. In addition to the Nb$_3$Sn quadrupole magnets, high-order Nb-Ti magnets are required for field correction. [...]
2024 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4003605
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