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Analysis of the Leakage Events in the Thermal Shield Cooling Pipes of the ITER Magnet System
/ Sgobba, Stefano (CERN) ; Santillana, Ignacio Aviles (CERN) ; Celuch, Michal (CERN) ; Crouvizier, Mickaël (CERN) ; Perez Fontenla, Ana Teresa (CERN) ; Castro, Enrique Rodriguez (CERN) ; Mitchell, Neil (Euratom, St. Paul Lez Durance) ; Koizumi, Norikiyo (Euratom, St. Paul Lez Durance) ; Pearce, Robert (Euratom, St. Paul Lez Durance) ; Worth, Liam (Euratom, St. Paul Lez Durance) et al.
The ITER Thermal Shields (TS) consist of actively cooled stainless steel panels. Their role is to minimise the radiation heat load from warm components, such as the Vacuum Vessel (VV) and the cryostat, hence contributing to insulating the magnet system operating at 4.5 K. [...]
2024 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4203405
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Status of the MQXFB Nb$_3$Sn quadrupoles for the HL-LHC
/ Izquierdo Bermudez, Susana (CERN) ; Ambrosio, Giorgio (Fermilab) ; Apollinari, Giorgio (Fermilab) ; Ballarino, Amalia (CERN) ; Barth, Christian (CERN) ; Crouvizier, Mickael Denis (CERN) ; Duarte Ramos, Delio (CERN) ; Devred, Arnaud (CERN) ; Feher, Sandor (Fermilab) ; Felice, Helene (CERN) et al.
The cold powering test of the first two prototypes of the MQXFB quadrupoles (MQXFBP1, now disassembled, and MQXFBP2), the Nb3Sn inner triplet magnets to be installed in the HL-LHC, has validated many features of the design, such as field quality and quench protection, but has found performance limitations. In fact, both magnets showed a similar phenomenology, characterized by reproducible quenches in the straight part inner layer pole turn, with absence of training and limiting the performance at 93% (MQXFBP1) and 98% (MQXFBP2) of the nominal current at 1.9 K, required for HL-LHC operation at 7 TeV. [...]
FERMILAB-PUB-22-860-TD.-
2023 - 9 p.
- Published in : IEEE Trans. Appl. Supercond. 33 (2023) 4001209
Fulltext: PDF; External link: Fermilab Library Server
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Challenges and Lessons Learned From Fabrication, Testing, and Analysis of Eight MQXFA Low Beta Quadrupole Magnets for HL-LHC
/ Ambrosio, Giorgio (Fermilab) ; Amm, Kathleen (Brookhaven) ; Anerella, Michael (Brookhaven) ; Apollinari, Giorgio (Fermilab) ; Izquierdo, Gonzalo Arnau (CERN) ; Baldini, Maria (Fermilab) ; Ballarino, Amalia (CERN) ; Barth, Christian (CERN) ; Yahia, Anis Ben (Brookhaven) ; Blowers, James (Fermilab) et al.
By the end of October 2022, the US HL-LHC Accelerator Upgrade Project (AUP) had completed fabrication of ten MQXFA magnets and tested eight of them. The MQXFA magnets are the low beta quadrupole magnets to be used in the Q1 and Q3 Inner Triplet elements of the High Luminosity LHC. [...]
arXiv:2301.09523; FERMILAB-PUB-22-855-TD.-
2023-08 - 8 p.
- Published in : IEEE Trans. Appl. Supercond. 33 (2023) 4003508
Fulltext: 2301.09523 - PDF; 81b192c337ae5d5acaec37450e135529 - PDF; External link: Fermilab Library Server
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Design and Fabrication of FRESCA2 Cryostat
/ Dallocchio, Alessandro (CERN) ; Carra, Federico (CERN) ; Tabian, Iuliana (CERN) ; Masci, Marco (CERN) ; Riffaud, Benoit (CERN) ; Zuccalli, Laurent ; Maire, Vincent ; Lombardo, Davide Maria (Universita e INFN, Firenze (IT)) ; Debeux, Julien ; Rigutto, Emilien (CERN) et al.
In the framework of the High Field Magnet activities, a new FRESCA2 test station (Facility for Reception of Superconducting Cables 2) was designed and fabricated at CERN to measure superconducting cables in background magnetic fields. [...]
CERN-ACC-NOTE-2022-0050.
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2022. - 5 p.
Full text
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7.
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Failure analysis of a heavy gauge fastener of the ITER toroidal field gravity support system
/ Sgobba, Stefano (CERN) ; Santillana, Ignacio Aviles (CERN) ; Buchanan, Katie Elizabeth (CERN) ; Celuch, Michal Dalemir (CERN) ; Crouvizier, Mickaël (CERN) ; Fontenla, Ana Teresa Perez (CERN) ; Castro, Enrique Rodriguez (CERN ; Carlos III U., Madrid) ; Beemsterboer, Cornelis (Euratom, St. Paul Lez Durance) ; Liao, Min (Euratom, St. Paul Lez Durance) ; Schild, Thierry (Euratom, St. Paul Lez Durance) et al.
The Gravity Supports (GS) of the ITER Toroidal Field (TF) coils are positioned at the bottom of the machine and
are situated under the 18 toroidal field coils. Each support includes 26 high strength bolts with M60 and M85
gauge. [...]
2023 - 5 p.
- Published in : Fusion Eng. Des. 186 (2023) 113353
Fulltext: PDF;
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8.
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Third-Generation CERN n_TOF Spallation Target: Final Design and Examinations of Irradiated Prototype
/ Esposito, Raffaele (CERN ; Ecole Polytechnique, Lausanne) ; Aberle, Oliver (CERN) ; Calviani, Marco (CERN) ; Coiffet, Thibaut (CERN) ; Crouvizier, Mickaël (CERN) ; Franqueira Ximenes, Rui (CERN) ; Maire, Vincent (CERN) ; Pérez Fontenla, Ana Teresa (CERN) ; Timmins, Marc (CERN)
The new neutron spallation target for the CERN neutron Time-Of-Flight (n_TOF) facility is based on a nitrogen-cooled Pb core impacted by short high-intensity proton beam pulses. An extensive material characterization campaign has been carried out to define the constitutive behavior of lead and assess its response under pulsed proton beam irradiation. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 3555-3558
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3555-3558
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9.
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Mechanical Characterization of Nb3Sn Cable Insulation Systems Used for HL-LHC Accelerator Magnets at Ambient Temperature
/ Wolf, Felix (CERN) ; Foussat, Arnaud (CERN) ; Lackner, Friedrich (CERN) ; Sgobba, Stefano (CERN) ; Crouvizier, Mickael (CERN) ; Canfer, Simon (Daresbury) ; Robertson, Steve (Daresbury)
The performance of accelerator magnets is strongly relying on the dielectric strength and mechanical robustness of the insulation system. This is in particular relevant for the current development of high field superconducting Nb
3
Sn magnets with the insulation system made from resin-impregnated glass fibres. [...]
2022 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 32 (2022) 7700205
In : 27th International Conference on Magnet Technology (MT-27), Fukuoka, Japan, 15 - 19 Nov 2021, pp.7700205
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10.
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Characterization of the Mechanical Properties of Nb$_3$Sn Coils
/ Fernández, José Luis Rudeiros (CERN) ; Perez, Juan Carlos (CERN) ; Ferradas Troitino, Salvador (CERN) ; Guinchard, Michael (CERN) ; Grosclaude, Philippe (CERN) ; Crouvizier, Mickael D (CERN) ; Langeslag, Stefanie (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Savary, Frederic (CERN)
The 11 T magnet and other high-field magnets in the framework of the High-Luminosity Large Hadron Collider project are based on epoxy resin impregnated Nb3Sn coils. This paper presents the development of an experimental measurement setup, and associated methodology for the determination of the mechanical properties in compression of epoxy resin impregnated Nb3Sn coils. [...]
2019 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 29 (2019) 8401205
In : Applied Superconductivity Conference 2018, Seattle, United States Of America, 28 Oct - 2 Nov 2018, pp.8401205
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