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Strain induced irreversible critical current degradation in highly dense Bi-2212 round wire
/ Bjoerstad, R (CERN) ; Scheuerlein, C (CERN) ; Rikel, M.O. (Nexans SuperConductors GmbH) ; Ballarino, A (CERN) ; Bottura, L (CERN) ; Jiang, J (Florida State U.) ; Matras, M (Florida State U.) ; Sugano, M (KEK, Tsukuba) ; Hudspeth, J (ESRF, Grenoble) ; Di Michiel, M (ESRF, Grenoble)
The strain induced critical current degradation of overpressure processed straight Bi 2212/Ag wires has been studied at 77 K in self-field. For the first time superconducting properties, lattice distortions, composite wire stress and strain have been measured simultaneously in a high energy synchrotron beamline. [...]
CERN-ACC-2015-0048.-
Geneva : CERN, 2015
- Published in : Supercond. Sci. Technol. 28 (2015) 062002
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Comparison of electromechanical properties and lattice distortions of different cuprate high temperature superconductors
/ Scheuerlein, C. (CERN) ; Bjoerstad, R (CERN) ; Grether, A (CERN) ; Rikel, M O ; Hudspeth, J (ESRF, Grenoble) ; Sugano, M (KEK, Tsukuba) ; Ballarino, A (CERN) ; Bottura, L (CERN)
The electromechanical properties of different cuprate high-temperature superconductors, notably two ReBCO tapes, a reinforced and a nonreinforced Bi-2223 tape, and a Bi-2212 wire, have been studied. The axial tensile stress and strain, as well as the transverse compressive stress limits at which an irreversible critical current degradation occurs, are compared. [...]
CERN-ACC-2016-0036.-
Geneva : CERN, 2016
- Published in : IEEE Trans. Appl. Supercond. 26 (2016) 8402007
Fulltext: PDF;
In : 12th European Conference on Applied Superconductivity, Lyon, France, 06 - 10 Sep 2015, pp.8402007
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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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Mechanical Properties and Strain-Induced Filament Degradation of Ex Situ and In Situ $MgB_{2}Wires$
/ Alknes, P (CERN) ; Hagner, M (Konstanz U.) ; Bjoerstad, R (CERN) ; Scheuerlein, C (CERN) ; Bordini, B (CERN) ; Sugano, M (KEK, Tsukuba) ; Hudspeth, J (ESRF, Grenoble) ; Ballarino, A (CERN)
We have compared the mechanical properties and the degradation of the critical current after uniaxial tensile loading at room temperature (RT) and at 77 K of ex situ and in situ $MgB_2$ wires. The strain that the wires can withstand without degradation is at 77 K substantially higher than at RT. [...]
2016 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 26 (2016) 8401205
In : 12th European Conference on Applied Superconductivity, Lyon, France, 06 - 10 Sep 2015, pp.8401205
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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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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.
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Synchrotron Microtomography Investigation of the Filament Microstructure in Differently Processed Bi-2212 Wires
/ Scheuerlein, Christian (CERN) ; Rack, Alexander (ESRF, Grenoble) ; Schladitz, Katja (Kaiserslautern U., Math. Dept.) ; Huwig, Luisa (Saarland U.)
The Bi-2212 microstructure and porosity distribution in entire state-of-the-art multifilament wires was characterized by high-energy synchrotron X-ray absorption microtomography after meltprocessing at ambient pressure, at 100 bar overpressure, and at ambient pressure after prior cold isostatic pressing of initially identical as-drawn wires. Beyond the visualization of the Bi-2212 microstructure, the porosity distribution in the different filament bundles has been quantified. [...]
2017 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 27 (2017) 6400205
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.6400205
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