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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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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
Fulltext: PDF;
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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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Coupling Current and Hysteresis Losses of Bi2212 Round Wires with Twisted Filaments
/ Yang, I (Southampton U.) ; Pelegrin, J (Southampton U.) ; Young, EA (Southampton U.) ; Falorio, I (Southampton U.) ; Ballarino, A (CERN) ; Bottura, L (CERN) ; Miao, H (Oxford Supercond. Tech., Carteret) ; Huang, Y (Oxford Supercond. Tech., Carteret)
AC loss measurements have been carried out on Bi2212 round wires of different twist pitches. With systematical variation of sample temperature (5 K – 70 K) and ac field amplitude (≤0.2 T) as well as frequency (20 Hz – 2 kHz), this work shows (a) the full coupling of the non-twisted wire, (b) the uncoupling of sub-wires by twisting at moderate pitch up to 12 mm, (c) a relatively short time constant of milliseconds for the coupling current due to a high transverse resistivity, and (d) an effective (de)coupling diameter of 0.4mm about 1.6x of sub-wire bundles. [...]
CERN-ACC-2015-0020.-
Geneva : CERN, 2015 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 25 (2015) 8200605
Fulltext: PDF;
In : Applied Superconductivity Conference 2014, Charlotte, NC, USA, 10 - 15 Aug 2014, pp.8200605
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Development of Superconducting Tuning Quadrupole Corrector (MQT) Prototypes for the LHC
/ Allitt, M ; Arshad, S A ; Hobl, A ; Ijspeert, Albert ; Karppinen, M ; Krischel, D ; Mazet, J ; Salminen, J ; Schillo, M ; Senis, R et al.
The main quadrupoles of the Large Hadron Collider (LHC) are connected in families of focusing and defocusing magnets. In order to make tuning corrections in the machine a number of quadrupole corrector magnets (designated MQT) are necessary. [...]
LHC-Project-Report-531; CERN-LHC-Project-Report-531.-
Geneva : CERN, 2002 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 12 (2002) 35-8
Access to fulltext document: PDF; IEEE Published version, local copy: PDF;
In : 17th International Conference on Magnet Technology, CERN, Geneva, Switzerland, 24 - 28 Sep 2001, pp.35-8
- Please contact the library if you need to access this document.
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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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20 T dipoles and Bi-2212: the path to LHC energy upgrade
/ McIntyre, P.M. (Texas A-M) ; Damborsky, K. (Texas A-M) ; Holik, E.F. (Texas A-M) ; Lu, F. (Texas A-M) ; McInturff, A.D. (Texas A-M) ; Pogue, N. (Texas A-M) ; Sattarov, A. (Texas A-M) ; Sooby, E. (Texas A-M)
Increasing the energy of the LHC would require a ring of \sim20 T magnets using the superconductors Nb$_{3}$Sn and Bi-2212/Ag. The technology for Bi-2212/Ag wire, cable, and coil has advanced significantly but is still far short of the performance needed for such magnets. [...]
arXiv:1108.1640.-
CERN, 2011 - 5 p.
- Published in : 10.5170/CERN-2011-003.70
Preprint: PDF; Published version from CERN: PDF; External link: Preprint
In : EuCARD-AccNet-EuroLumi Workshop : The High-Energy Large Hadron Collider, pp.70-74
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Progress in scale-up of R$E$BCO STAR™ wire for canted cosine theta coils and future strategies with enhanced flexibility
/ Kar, Soumen (Houston U.) ; Sandra, Jithin Sai (Houston U.) ; Luo, Wenbo (Houston U.) ; Yerraguravagari, Vamsi (Houston U.) ; Galstyan, Eduard (Houston U.) ; Jaroszynski, Jan (Florida State U.) ; Abraimov, Dmytro (Florida State U.) ; Majkic, Goran (Houston U.) ; Selvamanickam, Venkat (Houston U.)
We report recent developments in the scale-up of symmetric RE-Ba-Cu-O (R$E$BCO) tapes with 15–22 μm thick substrates. Using these symmetric R$E$BCO tapes, we fabricated up to 10 m long, symmetric tape round (STAR™) R$E$BCO wires, less than 2 mm diameter, using 1.02 mm and 0.81 mm diameter copper formers. [...]
2020 - 12 p.
- Published in : Supercond. Sci. Technol. 33 (2020) 094001
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