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Evaluation of critical current density and residual resistance ratio limits in powder in tube Nb3Sn conductors
/ Segal, Christopher (Natl. High Mag. Field Lab.) ; Tarantini, Chiara (Natl. High Mag. Field Lab.) ; Sung, Zu Hawn (Natl. High Mag. Field Lab.) ; Lee, Peter J (Natl. High Mag. Field Lab.) ; Sailer, Bernd (Heraeus, Hanau) ; Thoener, Manfred (Heraeus, Hanau) ; Schlenga, Klaud (Heraeus, Hanau) ; Ballarino, Amalia (CERN) ; Bottura, Luca (CERN) ; Bordini, Bernardo (CERN) et al.
High critical current density ( Jc) Nb3Sn A15 multifilamentary wires require a large volume fraction of small grain (SG), superconducting A15 phase, as well as Cu stabilizer with high Residual Resistance Ratio (RRR) to provide electromagnetic stabilization and protection. In powder-in-tube (PIT) wires the unreacted Nb7.5 wt%Ta outer layer of the tubular filaments acts as a diffusion barrier and protects the interfilamentary Cu stabilizer from Sn contamination. [...]
CERN-ACC-2016-0340.-
2016 - 10.
- Published in : Supercond. Sci. Technol. 29 (2016) 085003
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2.
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Texture in state-of-the-art Nb3Sn multifilamentary superconducting wires
/ Scheuerlein, C (CERN) ; Arnau, G (CERN) ; Alknes, P (CERN) ; Jimenez, N (CERN) ; Bordini, B (CERN) ; Ballarino, A (CERN) ; Di Michiel, M (ESRF, Grenoble) ; Thilly, L (Futuroscope Chasseneuil, Poitiers U. Pprime Inst.) ; Besara, T (Florida State U., Tallahassee (main) ; Natl. High Mag. Field Lab.) ; Siegrist, T (Florida State U., Tallahassee (main) ; Natl. High Mag. Field Lab.)
The texture of Nb3Sn in recent multifilamentary composite wires has been studied by neutron diffraction, synchrotron x-ray diffraction and electron backscatter diffraction. In powder-in-tube (PIT) type superconductors the Nb precursor filaments exhibit a strong 〈110〉 fiber texture as a consequence of the severe cold drawing process, and a 〈110〉 texture is also observed in the Nb3Sn. [...]
2014
- Published in : Supercond. Sci. Technol. 27 (2014) 025013
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3.
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Stress distribution and lattice distortions in Nb3Sn 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 Nb3Sn 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 Nb3Sn 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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4.
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A transformative superconducting magnet technology for fields well above 30 T using isotropic round wire multifilament Bi2Sr2CaCu2O8−x conductor
/ Larbalestier, D.C. (Natl. High Mag. Field Lab.) ; Jiang, J. (Natl. High Mag. Field Lab.) ; Trociewitz, U.P. (Natl. High Mag. Field Lab.) ; Kametani, F. (Natl. High Mag. Field Lab.) ; Scheuerlein, C. (CERN) ; Dalban-Canassy, M. (Natl. High Mag. Field Lab.) ; Matras, M. (Natl. High Mag. Field Lab.) ; Chen, P. (Natl. High Mag. Field Lab.) ; Craig, N.C. (Natl. High Mag. Field Lab.) ; Lee, P.J. (Natl. High Mag. Field Lab.) et al.
We report here that magnetic fields of almost 34 T, far above the upper 24 T limit of Nb3Sn, can be generated using a multifilament round wire conductor made of the high temperature cuprate superconductor Bi2Sr2CaCu2O8-x (Bi-2212). [...]
arXiv:1305.1269.
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2013. - 14 p.
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5.
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Isotropic round-wire multifilament cuprate superconductor for generation of magnetic fields above 30 T
/ Larbalestier, D C (Natl. High Mag. Field Lab.) ; Jiang, J (Natl. High Mag. Field Lab.) ; Trociewitz, U P (Natl. High Mag. Field Lab.) ; Kametani, F (Natl. High Mag. Field Lab.) ; Scheuerlein, C (CERN) ; Dalban-Canassy, M (Natl. High Mag. Field Lab.) ; Matras, M (Natl. High Mag. Field Lab.) ; Chen, P (Natl. High Mag. Field Lab.) ; Craig, N C (Natl. High Mag. Field Lab.) ; Lee, P J (Natl. High Mag. Field Lab.) et al.
Magnets are the principal market for superconductors, but making attractive conductors out of the high-temperature cuprate superconductors (HTSs) has proved difficult because of the presence of high-angle grain boundaries that are generally believed to lower the critical current density, Jc. To minimize such grain boundary obstacles, HTS conductors such as REBa2Cu3O7−x and (Bi, Pb)2Sr2Ca2Cu3O10−x are both made as tapes with a high aspect ratio and a large superconducting anisotropy. [...]
2014 - 7 p.
- Published in : Nature Mater. 13 (2014) 375-381
External link: ADSABS
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6.
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The Bundle-Barrier PIT Wire Developed for the HiLumi LHC Project
/ Bordini, Bernardo (CERN) ; Ballarino, Amalia (CERN) ; Macchini, Matteo (CERN) ; Richter, David (CERN) ; Sailer, Bernd (Bruker EAS GmbH, Hanau) ; Thoener, Manfred (Bruker EAS GmbH, Hanau) ; Schlenga, Klaus (Bruker EAS GmbH, Hanau)
Abstract:
For the HiLumi Large Hadron Collider Project, CERN is developing dipole and quadrupole magnets based on state-of-the-art high-Jc Nb3Sn wires that are expected to operate at 1.9 K and at fields larger than 11 T. Two different types of Nb3Sn wires are considered for the project: the powder in tube (PIT) and the restacked rod process conductors manufactured, respectively, by Bruker-EAS and Oxford superconducting technology. [...]
2017 - 6 p.
- Published in : IEEE Trans. Appl. Supercond. 27 (2017) 6000706
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.6000706
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8.
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Evidence for length-dependent wire expansion, filament dedensification and consequent degradation of critical current density in Ag-alloy sheathed Bi-2212 wires
/ Malagoli, A (Natl. High Mag. Field Lab.) ; Lee, P J (Natl. High Mag. Field Lab.) ; Ghosh, A K (Brookhaven) ; Scheuerlein, C (CERN) ; Di Michiel, M (ESRF, Grenoble) ; Jiang, J (Natl. High Mag. Field Lab.) ; Trociewitz, U P (Natl. High Mag. Field Lab.) ; Hellstrom, E E (Natl. High Mag. Field Lab.) ; Larbalestier, D C (Natl. High Mag. Field Lab.)
It is well known that longer Bi-2212 conductors have significantly lower critical current density (Jc) than shorter ones, and recently it has become clear that a major cause of this reduction is internal gas pressure generated during heat treatment, which expands the wire diameter and dedensifies the Bi-2212 filaments. Here we report on the length-dependent expansion of 5 to 240 cm lengths of state-of-the-art, commercial Ag alloy-sheathed Bi-2212 wire after full and some partial heat treatments. [...]
arXiv:1302.3370.-
2013 - 25 p.
- Published in : Supercond. Sci. Technol. 26 (2013) 055018
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9.
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Very high upper critical fields and enhanced critical current densities in Nb3Sn superconductors based on Nb–Ta–Zr alloys and internal oxidation
/ Buta, F (U. Geneva (main)) ; Bonura, M (U. Geneva (main)) ; Matera, D (U. Geneva (main)) ; Bovone, G (U. Geneva (main)) ; Ballarino, A (CERN) ; Hopkins, S C (CERN) ; Bordini, B (CERN) ; Chaud, X (Natl. High Mag. Field Lab.) ; Senatore, C (U. Geneva (main))
The inhibition of Nb3Sn grain growth in the presence of ZrO2 nanoparticles appears to be one of
the most promising method for pushing the critical current densities of Nb3Sn superconducting
wires to levels that meet the requirements set for the Future Circular Collider. We have investigated
the effect of ZrO2 nanoparticles formed by the internal oxidation of Zr on the superconducting
properties and microstructure of Nb3Sn formed from Nb-1 wt%Zr, Nb-7.5 wt%Ta,
Nb-7.5 wt%Ta-1 wt%Zr and Nb-7.5 wt%Ta-2 wt%Zr alloys. [...]
2021 - 14 p.
- Published in : J. Phys. Mater. 4 (2021) 025003
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10.
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Artificial Pinning in Nb3Sn Wires
/ Spina, Tiziana (CERN) ; Ballarino, Amalia (CERN) ; Bottura, Luca (CERN) ; Scheuerlein, Christian (CERN) ; Flukiger, Rene (CERN)
Two different processes are known to create “artificial” pinning centers in superconductors: 1) high energy irradiation; and 2) nanoinclusions. Own results on the critical current density Jc of Nb3Sn wires after irradiation by protons are compared to the effects obtained by neutrons (on the same wires) and by nanoinclusions from the literature. [...]
2017 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 27 (2017) 8001205
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.8001205
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