1.
|
Evaluation of critical current density and residual resistance ratio limits in powder in tube Nb$_{3}$Sn 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) Nb$_{3}$Sn 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
Fulltext: PDF;
|
|
2.
|
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
|
|
3.
|
|
|
A transformative superconducting magnet technology for fields well above 30 T using isotropic round wire multifilament $Bi_2Sr_2CaCu_2O_{8-x}$ 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.
-
2013. - 14 p.
Full text
|
|
4.
|
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, J$_c$. To minimize such grain boundary obstacles, HTS conductors such as REBa$_2$Cu$_3$O$_{7−x}$ and (Bi, Pb)$_2$Sr$_2$Ca$_2$Cu$_3$O$_{10−x}$ 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
|
|
5.
|
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
|
|
6.
|
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
Fulltext: PDF;
|
|
7.
|
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 Nb$_{3}$Sn wires that are expected to operate at 1.9 K and at fields larger than 11 T. Two different types of Nb$_{3}$Sn 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
|
|
8.
|
Reduction of Gas Bubbles and Improved Critical Current Density in Bi-2212 Round Wire by Swaging
/ Jiang, J (Natl. High Mag. Field Lab.) ; Miao, H (Oxford Supercond. Tech., Carteret) ; Huang, Y (Oxford Supercond. Tech., Carteret) ; Hong, S (Oxford Supercond. Tech., Carteret ; HJC Enterprise, New Providence) ; Parrell, J (Oxford Supercond. Tech., Carteret) ; Scheuerlein, C (CERN) ; Di Michiel, M (ESRF, Grenoble) ; Ghosh, A (Brookhaven) ; Trociewitz, U (Natl. High Mag. Field Lab.) ; Hellstrom, E (Natl. High Mag. Field Lab.) et al.
Bi-2212 round wire is made by the powder-in-tube technique. An unavoidable property of powder-in-tube conductors is that there is about 30% void space in the as-drawn wire. [...]
CERN-ATS-2013-030.-
Geneva : CERN, 2013
- Published in : IEEE Trans. Appl. Supercond. 23 (2013) 6400206
Fulltext: PDF;
In : Applied Superconductivity Conference 2012: The Next Century of Superconductivity, Portland, OR, USA, 7 - 12 Oct 2012
|
|
9.
|
Influence of the oxygen partial pressure on the phase evolution during Bi-2212 wire melt processing
/ Scheuerlein, C. (CERN) ; Andrieux, J. (Lyon U.) ; Rikel, M.O. (Nexans, Germany) ; Kadar, J. (U. Erlangen-Nuremberg (main)) ; Doerrer, C. (CERN) ; Di Michiel, M. (ESRF, Grenoble) ; Ballarino, A. (CERN) ; Bottura, L. (CERN) ; Jiang, J. (Natl. High Mag. Field Lab.) ; Kametani, F. (Natl. High Mag. Field Lab.) et al.
We have studied the influence of the oxygen partial pressure pO2 up to 5.5 bar on the phase changes that occur during melt processing of a state-of-the-art Bi-2212 multifilamentary wire. Phase changes have been monitored in situ by high energy synchrotron X-ray diffraction (XRD). [...]
CERN-ACC-2016-0034.-
Geneva : CERN, 2016
- Published in : IEEE Trans. Appl. Supercond. 26 (2016) 6400304
Fulltext: PDF;
In : 12th European Conference on Applied Superconductivity, Lyon, France, 06 - 10 Sep 2015, pp.6400304
|
|
10.
|
|