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Investigating the effect of rolling deformation on the electro-mechanical limits of Nb$_{3}$Sn wires produced by RRP$^{®}$ and PIT technologies / Bagni, T (U. Geneva (main) ; Uppsala U.) ; Calzolaio, C (PSI, Villigen) ; Bovone, G (U. Geneva (main)) ; Ferradas-Troitino, J (CERN) ; Barth, C (CERN) ; Ballarino, A (CERN) ; Senatore, C (U. Geneva (main))
Future high-field magnets for particle accelerators hinge on the crucial development of advanced Nb$_{3}$Sn wires engineered to withstand the large stresses generated during magnet assembly and operation. The superconducting properties of Nb$_{3}$Sn enable the design of compact accelerator-quality magnets above 10 T, but at the same time the brittleness and strain sensitivity of the material impose careful consideration of the mechanical limits. [...]
2024 - 16 p. - Published in : Supercond. Sci. Technol. 37 (2024) 095013 Fulltext: PDF;

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(91)

Degradation of I $_{c}$ due to residual stress in high-performance Nb$_{3}$Sn wires submitted to compressive transverse force / Senatore, C (U. Geneva (main) ; Geneva U.) ; Bagni, T (U. Geneva (main)) ; Ferradas-Troitino, J (U. Geneva (main) ; CERN) ; Bordini, B (CERN) ; Ballarino, A (CERN)
Future particle colliders in search for new physics at the energy frontier require the development of accelerator magnets capable of producing fields well beyond those attainable with Nb-Ti. As the next generation of high-field accelerator magnets is presently planned to be based on Nb$_{3}$Sn, it becomes crucial to establish precisely the mechanical limits at which this brittle and strain sensitive superconductor can operate safely. [...]
2023 - 8 p. - Published in : Supercond. Sci. Technol. 36 (2023) 075001 Fulltext: PDF;

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(52)

Transverse-pressure susceptibility of high-$J_c$ RRP and PIT types of Nb$_3$Sn Rutherford cables for accelerator magnets / Gao, P (Hefei, Inst. Plasma Phys. ; Twente U., Enschede) ; Dhallé, M (Twente U., Enschede) ; Bordini, B (CERN) ; Ballarino, A (CERN) ; Ten Kate, H H J (Twente U., Enschede)
In the frame of the High-Luminosity Large Hadron Collider construction and Future Circular Collider development program, the magnetic field in the accelerator dipole magnets is being enhanced to 11 T, and 15 T to 16 T level, respectively. Advanced Nb3Sn superconductors with a non-copper critical current density exceeding 2500 A mm$^{−2}$ at 4.2 K and 12 T, are being developed using the Restacked-Rod-Process (RRP) and Powder-In-Tube (PIT) wire technologies. [...]
2020 - 18 p. - Published in : Supercond. Sci. Technol. 33 (2020) 125005

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(51)

Critical Current Measurements Under Transverse Pressure of a Nb3Sn Rutherford Cable Based on 1 mm RRP Wires / Duvauchelle, Jean-Eudes (CERN) ; Bordini, Bernardo (CERN) ; Fleiter, Jérôme (CERN) ; Ballarino, Amalia (CERN)
In order to achieve higher magnetic fields and/or larger magnet apertures, next generation accelerator magnets will be based on high-$J_{c}$ Nb$_{3}$Sn Rutherford cables. For the HighLuminosity LHC project, CERN is manufacturing dipole and quadrupole magnets based on state-of-the-art high-$J_{c}$ Nb$_{3}$Sn superconductor. [...]
2018 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4802305
In : 13th European Conference on Applied Superconductivity, ICCG, Geneva, Switzerland, 17 - 21 Sep 2017, pp.4802305

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(48)

A 3D Finite Element Model of the Reversible Critical Current Reduction Due to Transverse Load in Nb$_{3}$Sn Wires / Cattabiani, A (CERN) ; Baffari, D (CERN) ; Bordini, B (CERN)
For the next generation of high-field accelerator magnets, CERN relies on Nb $_{3}$ Sn Rutherford cables. This material is extremely brittle and its superconducting properties are strongly dependent on the strain state. [...]
2020 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 30 (2020) 8401006

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(48)

Effect of the Sub-Elements Layout on the Electro-Mechanical Properties of High Jc Nb3Sn Wires Under Transverse Load: Numerical Simulations / Baffari, D (CERN) ; Bordini, B (CERN)
The brittle intermetallic Nb 3 Sn superconductor is currently being used to develop high field magnets in the framework of the Hi-Luminosity upgrade of the Large Hadron Collider at CERN. Despite its excellent superconductive properties,Nb 3 Sn wires suffer from significant critical current Ic reduction due to the transverse load applied during the magnets’ assembly and energization. [...]
2022 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 32 (2022) 6001306
In : 27th International Conference on Magnet Technology (MT-27), Fukuoka, Japan, 15 - 19 Nov 2021, pp.6001306

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(47)

Advanced Nb$_{3}$Sn conductors tested in a racetrack coil configuration for the 11T dipole project / Bajas, Hugues (CERN) ; Bajko, Marta (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Rochepault, Etienne (CERN) ; Lorenzo Gomez, Jose V (CERN) ; Chiuchiolo, Antonella (CERN) ; Perez, Juan Carlos (CERN)
Within the 11T dipole magnet conductor development for the high-luminosity LHC upgrade, two types of Nb3 Sn cable based on the powder-in-tube (PIT) and the Rod and Restack processes (RRP) are tested in racetrack configuration in the short model coil (SMC) magnets. In 2016 and 2017, the performances of three different coils wound with 40-strand cables, one made of OST RRP 132/169 and two of PIT 120 strands have been measured using the SMC structure. [...]
2018 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4008605
In : 13th European Conference on Applied Superconductivity, ICCG, Geneva, Switzerland, 17 - 21 Sep 2017, pp.4008605

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(47)

Effects of the initial axial strain state on the response to transverse stress of high-performance RRP Nb$_3$Sn wires / Troitino, J Ferradas (CERN ; Geneva U.) ; Bagni, T (Geneva U.) ; Barth, C (CERN) ; Bordini, B (CERN) ; Ferracin, P (LBL, Berkeley) ; Gamperle, L (Geneva U.) ; Tommasini, D (CERN) ; Zurmuehle, D (Geneva U.) ; Senatore, C (Geneva U.)
High-performance Nb$_3$Sn superconducting wires have become one of the key technologies for the development of next generation accelerator magnets. While their large critical current densities enable the design of compact accelerator-quality magnets for their operation above 10 T, the noticeable reduction of the conductor performance due to mechanical strain appears as a new essential characteristic in magnet design. [...]
2021 - 10 p. - Published in : Supercond. Sci. Technol. 34 (2021) 035008 Fulltext: PDF;

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(46)

Stress distribution and lattice distortions in Nb$_{3}$Sn multifilament wires under uniaxial tensile loading at 4.2 K / Scheuerlein, C (CERN) ; Di Michiel, M (ESRF, Grenoble) ; Buta, F (U. Geneva (main)) ; Seeber, B (U. Geneva (main)) ; Senatore, C (U. Geneva (main)) ; Flükiger, R (CERN ; U. Geneva (main)) ; Siegrist, T (Florida State U., Tallahassee (main) ; Natl. High Mag. Field Lab.) ; Besara, T ; Kadar, J (CERN) ; Bordini, B (CERN) et al.
The lattice parameter changes in three types of Nb$_{3}$Sn superconducting wires during uniaxial stress-strain measurements at 4.2 K have been measured by high-energy synchrotron x-ray diffraction. The nearly-stress-free Nb$_{3}$Sn lattice parameter has been determined using extracted filaments, and the elastic strain in the axial and transverse wire directions in the different wire phases has been calculated. [...]
2014 - Published in : Supercond. Sci. Technol. 27 (2014) 044021
In : 11th European Conference on Applied Superconductivity, Genova, Italy, 15 - 19 Sep 2013, pp.044021

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10.

(46)

On the mechanisms governing the critical current reduction in Nb$_{3}$Sn Rutherford cables under transverse stress / De Marzi, Gianluca (ENEA, Frascati ; CERN) ; Bordini, Bernardo (CERN) ; Baffari, Dario (CERN)
Within the framework of the HiLumi-LHC project, CERN is currently manufacturing 11 T dipole and quadrupole accelerator magnets using state-of-the-art Nb$_{3}$Sn Rutherford cables. Even higher magnetic fields are considered by the Hadron Future Circular Collider (FCC-hh) design study, which plans to develop 16 T Nb$_{3}$Sn bending dipoles. [...]
2021 - 15 p. - Published in : Sci. Rep. 11 (2021) 7369 Fulltext: PDF;

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