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Correlation of critical current density to quasi-biaxial texture and grain boundary cleanliness in fully dense Bi-2212 wires
/ Oloye, T A (Florida State U.) ; Matras, M (CERN) ; Jiang, J (Florida State U.) ; Hossain, S I (Florida State U.) ; Su, Y (Florida State U.) ; Trociewitz, U P (Florida State U.) ; Hellstrom, E E (Florida State U. ; Florida A-M) ; Larbalestier, D C (Florida State U. ; Florida A-M) ; Kametani, F (Florida State U. ; Florida A-M)
The distinctive quasi-biaxial texture of Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{x}$ (Bi-2212) plays an important role in enabling high critical current density (J$_{c}$) in Bi-2212 round wires (RWs). Here we studied three over pressure heat treated wires with J$_{c}$ varying by a factor of ∼10, all being fully dense. [...]
2021 - 11 p.
- Published in : Supercond. Sci. Technol. 34 (2021) 035018
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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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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
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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, 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
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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.
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2013. - 14 p.
Full text
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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
Fulltext: PDF;
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Void and Phase Evolution during the Processing of Bi-2212 Superconducting Wires monitored by combined fast Synchrotron Micro-tomography and X-Ray Diffraction
/ Scheuerlein, C (CERN) ; DiMichiel, M (ESRF, Grenoble) ; Scheel, M (ESRF, Grenoble) ; Jiang, J (Natl. High Mag. Field Lab) ; Kametani, F (Natl. High Mag. Field Lab) ; Malagoli, A (Natl. High Mag. Field Lab) ; Hellstrom, E E (Natl. High Mag. Field Lab) ; Larbalestier, D C (Natl. High Mag. Field Lab)
Recent study of the current-limiting mechanisms in Bi-2212 round wires has suggested that agglomeration of the residual Bi-2212 powder porosity into bubbles of filament-diameter size occurs on melting the Bi-2212 filaments. [...]
CERN-ATS-2011-243.
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2011. - 11 p.
Full text
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Bubble Formation within Filaments of Melt-Processed Bi2212 wires and its strongly negative effect on the Critical Current Density
/ Kametani, F (Florida State U.) ; Shen, T (Florida State U. ; Fermilab) ; Jiang, J (Florida State U.) ; Scheuerlein, C (CERN) ; Malagoli, A (Florida State U.) ; Di Michiel, M (ESRF, Grenoble) ; Huang, Y (Oxford Supercond. Tech., Carteret) ; Miao, H (Oxford Supercond. Tech., Carteret) ; Parrell, J A (Oxford Supercond. Tech., Carteret) ; Hellstrom, E E (Florida State U.) et al.
Most studies of Bi2Sr2CaCu2Ox (Bi2212) show that the critical current density Jc is limited by the connectivity of the filaments, but what determines the connectivity is still elusive. Here we report on the role played by filament porosity in limiting Jc [...]
CERN-ATS-2011-010.-
Geneva : CERN, 2011 - 7 p.
- Published in : Supercond. Sci. Technol. 24 (2011) 075009
Fulltext: PDF;
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Metallographic investigation of fracture behavior in ITER-style Nb$_{3}$Sn superconducting strands
/ Jewell, M C (Natl. High Mag. Field Lab.) ; Lee, P J (Natl. High Mag. Field Lab.) ; Larbalestier, D C (Natl. High Mag. Field Lab.) ; Nijhuis, A (Twente, U.)
In this work we specify the extent to which fracture in two ITER-style Nb$_{3}$Sn composite strands occurs in a collective or individual manner, under mechanical tension and bending from the TARSIS apparatus at the University of Twente. A bronze-route strand from European Advanced Superconductors (EAS), which has very uniform, well-spaced filaments, has a widely distributed (200 μm) fracture field and exhibits a composite of individual and collective cracks. [...]
CERN, 2009
Published version from CERN: PDF;
In : Workshop on Accelerator Magnet Superconductors, Design and Optimization, CERN, Geneva, Switzerland, 19 - 23 May 2008, pp.30-32 (CERN-2009-001)
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