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Evidence of Kramer extrapolation inaccuracy for predicting high field Nb$_3$Sn properties
/ Segal, Christopher (Florida State U. ; CERN) ; Barth, Christian (CERN) ; Falorio, Iole (CERN) ; Carlón Zurita, Alejandro (CERN) ; Ballarino, Amalia (CERN) ; Chaud, Xavier (LNCMI, Grenoble) ; Tarantini, Chiara (Florida State U.) ; Lee, Peter J (Florida State U.) ; Larbalestier, David C (Florida State U.)
Future applications requiring high magnetic fields, such as the proposed Future Circular Collider, demand a substantially higher critical current density, $J_c$, at fields ≥16 T than is presently available in any commercial strand, so there is a strong effort to develop new routes to higher $J_c$ Nb$_3$Sn. As a consequence, evaluating the irreversibility field ($H_{irr}$) of any new conductor to ensure reliable performance at these higher magnetic fields becomes essential. [...]
IOP, 2020 - 9 p.
- Published in : J. Phys.: Conf. Ser. 1559 (2020) 012062
Published fulltext: PDF;
In : 14th European Conference on Applied Superconductivity, Glasgow, United Kingdom, 1 - 5 Sep 2019, pp.012062
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2.
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Artificial Pinning in Nb$_3$Sn 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 $J_c$ of $Nb_3Sn$ 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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3.
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Elastic anisotropy in multifilament Nb$_3$Sn superconducting wires
/ Scheuerlein, C (CERN) ; Fedelich, B (CERN) ; Alknes, P (CERN) ; Arnau, G (CERN) ; Bjoerstad, R (CERN) ; Bordini, B (CERN)
The elastic anisotropy caused by the texture in the Nb$_{3}$Sn filaments of PIT and RRP wires has been calculated by averaging the estimates of Voigt and Reuss, using published Nb$_{3}$Sn single crystal elastic constants and the Nb$_{3}$Sn grain orientation distribution determined in both wire types by Electron Backscatter Diffraction. At ambient temperature the calculated Nb$_{3}$Sn E-moduli in axial direction in the PIT and the RRP wire are 130 GPa and 140 GPa, respectively. [...]
CERN-ACC-2015-0022.-
Geneva : CERN, 2015 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 25 (2015) 8400605
Fulltext: PDF;
In : Applied Superconductivity Conference 2014, Charlotte, NC, USA, 10 - 15 Aug 2014, pp.8400605
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4.
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5.
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Texture in state-of-the-art Nb$_{3}$Sn 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 Nb$_{3}$Sn 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 Nb$_{3}$Sn. [...]
2014
- Published in : Supercond. Sci. Technol. 27 (2014) 025013
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6.
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Cable Design and Development for the High-Temperature Superconductor Cable Test Facility Magnet
/ Pong, Ian (LBNL, Berkeley) ; Hafalia, Aurelio (LBNL, Berkeley) ; Higley, Hugh (LBNL, Berkeley) ; Lee, Elizabeth (LBNL, Berkeley) ; Lin, Andy (LBNL, Berkeley) ; Naus, Michael (LBNL, Berkeley) ; Perez, Carlos (LBNL, Berkeley) ; Prestemon, Soren (LBNL, Berkeley) ; Sabbi, GianLuca (LBNL, Berkeley) ; Hopkins, Simon (CERN) et al.
A large bore “High-Temperature Superconductor Cable Test Facility Magnet” for testing advanced cables and inserts in high transverse field is in its design phase. This magnet will be the core component of a facility for developing conductors and accelerator magnets operating above 15 T, an enabling technology for next-generation fusion devices using magnetic confinement of plasma and for future energy frontier colliders. [...]
2021 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 31 (2021) 1-5
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7.
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Effects of the oxygen source configuration on the superconducting properties of internally-oxidized internal-Sn Nb$_{3}$Sn wires
/ Bovone, G (Geneva U.) ; Buta, F (Geneva U.) ; Lonardo, F (Geneva U.) ; Bagni, T (Geneva U.) ; Bonura, M (Geneva U.) ; LeBoeuf, D (LNCMI, Grenoble) ; Hopkins, S C (CERN) ; Boutboul, T (CERN) ; Ballarino, A (CERN) ; Senatore, C (Geneva U.)
We successfully manufactured 12-filament rod-in-tube Nb$_{3}$Sn wires with oxide nanoparticles formed by the internal oxidation method. We employed Nb-7.5 wt%Ta-1 wt%Zr and Nb-7.5 wt%Ta-2 wt% Hf alloys along with oxygen sources (OSs) in two different configurations—in the core of Nb filaments (coreOS) and at the boundary between the filaments and the Cu tube (annularOS)—to assess the influence of the OS layout on the superconducting properties and grain size. [...]
2023 - 11 p.
- Published in : Supercond. Sci. Technol. 36 (2023) 095018
Fulltext: PDF;
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8.
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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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9.
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Effect of the fabrication route on the phase and volume changes during the reaction heat treatment of Nb3Sn superconducting wires
/ Scheuerlein, C (CERN) ; Andrieux, J (Lyon U.) ; Michels, M (CERN) ; Lackner, F (CERN) ; Meyer, C (BAM, Berlin) ; Chiriac, R (Lyon U.) ; Toche, F (Lyon U.) ; Hagner, M (Konstanz U.) ; Di Michiel, M (ESRF, Grenoble)
Accelerator magnets that can reach magnetic fields well beyond the Nb-Ti performance limits are presently being built and developed, using Nb$_3$Sn superconductors. This technology requires reaction heat treatment (RHT) of the magnet coils, during which Nb$_3$Sn is formed from its ductile precursor materials (a “wind and react” approach). [...]
2020 - 13 p.
- Published in : Supercond. Sci. Technol. 33 (2020) 034004
Fulltext: PDF;
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10.
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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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