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1.
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Effects of K excess in microstructure of (Ba$_{0.6}$K$_{0.4}$)Fe$_{2}$As$_{2}$ superconducting powders
/ Bellingeri, Emilio (CNR-SPIN, Naples) ; Bernini, Cristina (CNR-SPIN, Naples) ; Loria, Federico (CNR-SPIN, Naples) ; Traverso, Andrea (CNR-SPIN, Naples) ; Leveratto, Alessandro (CNR-SPIN, Naples) ; Braccini, Valeria (CNR-SPIN, Naples) ; Ballarino, Amalia (CERN) ; Malagoli, Andrea (CNR-SPIN, Naples)
Iron-based superconductors (IBSs) are promising for high-field applications due to their exceptional characteristics, like ultrahigh upper critical field and minimal electromagnetic anisotropy. Creating multifilamentary superconducting wires with elevated transport critical current density is essential for practical use. [...]
2024 - 9 p.
- Published in : Supercond. Sci. Technol. 37 (2024) 095014
Fulltext: PDF;
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Evidence for Longitudinal Homogeneity and No J$_e$ Degradation in Bi-2212 Wires Realized by the GDG Process
/ Leoncino, Luca (CNR-SPIN, Naples) ; Celentano, Giuseppe (ENEA, Rome) ; Chiarelli, Sandro (ENEA, Rome) ; Leveratto, Alessandro (CNR-SPIN, Naples) ; Putti, Marina (U. Genoa) ; Ferdeghini, Carlo (CNR-SPIN, Naples) ; Ballarino, Amalia (CERN) ; Hopkins, Simon C (CERN) ; Malagoli, Andrea (CNR-SPIN, Naples)
The GDG fabrication process developed at CNR-SPIN is a promising method for producing Bi-2212 wires without overpressure processing. In this paper, critical current measurements performed at ENEA on both short and long samples in magnetic fields up to 14 T are compared. [...]
2019 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 29 (2019) 6400305
In : Applied Superconductivity Conference 2018, Seattle, United States Of America, 28 Oct - 2 Nov 2018, pp.6400305
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3.
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Analysis of Fe(Se,Te) Films Deposited On Unbuffered Invar 36
/ Sylva, Giulia (Genoa U.) ; Malagoli, Andrea (CNR-SPIN, Genova) ; Bellingeri, Emilio (CNR-SPIN, Genova) ; Putti, Marina (Genoa U.) ; Ferdeghini, Carlo (CNR-SPIN, Genova) ; Vannozzi, Angelo (ENEA, Frascati) ; Celentano, Giuseppe (ENEA, Frascati) ; Hopkins, Simon C (CERN) ; Lunt, Alexander (CERN) ; Ballarino, Amalia (CERN) et al.
In this paper, the feasibility of producing Fe(Se,Te)-coated conductors on cost-effective, unbuffered Invar 36 substrates is studied. A suitable substrate with a sharp {001}<100> texture and a misorientation angle lower than 10° was developed, and the possibility of growing epitaxial thin films without any buffer layer was demonstrated. [...]
2019 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 29 (2019) 7300105
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4.
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The CERN FCC Conductor Development Program: A Worldwide Effort for the Future Generation of High Field Magnets
/ Ballarino, Amalia (CERN) ; Hopkins, Simon (CERN) ; Bordini, Bernardo (CERN) ; Richter, David (CERN) ; Tommasini, Davide (CERN) ; Bottura, Luca (CERN) ; Benedikt, Michael (CERN) ; Sugano, Michinaka ; Ogitsu, Toru ; Kawashima, Shinya (Kobe Steel) et al.
The study of next-generation high-energy accelerators based on 16 T dipoles has emphasized the need for higher performance, cost-effective Nb$_3$Sn superconducting wires. A Conductor Development Program aiming to reach a non-copper critical current density ($J_c$) of 1500 A/mm2 at 16 T and 4.2 K has been launched by CERN, with the involvement of industry and laboratories worldwide. [...]
CERN-ACC-2019-0001.-
Geneva : CERN, 2019 - 9 p.
- Published in : IEEE Trans. Appl. Supercond. 29 (2019) 6000709
Fulltext: PDF;
In : Applied Superconductivity Conference 2018, Seattle, United States Of America, 28 Oct - 2 Nov 2018, pp.6000709
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5.
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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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7.
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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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8.
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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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9.
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Current $MgB_{2}$ wire performance and their industrial development
/ Grasso, G (Columbus Superconductors, Genoa) ; Brisigotti, S (Columbus Superconductors, Genoa) ; Pietranera, D (Columbus Superconductors, Genoa) ; Tumino, A (Columbus Superconductors, Genoa) ; Berta, S (Columbus Superconductors, Genoa) ; Penco, R (Columbus Superconductors, Genoa) ; Demencik, E (Columbus Superconductors, Genoa) ; Braccini, V (CNR-INFM, Genoa) ; Malagoli, A (CNR-INFM, Genoa) ; Vignolo, M (CNR-INFM, Genoa) et al.
Although just recently discovered as a superconductor, Magnesium Diboride has already demonstrated its clear potential for an effective use in a variety of applications. With its critical temperature of about 40 K, MgBB2 gives the opportunity to operate devices at cryogenic temperatures of the order of 20 K, allowing for the use of alternative, cost effective, and simpler technologies than liquid helium. [...]
CERN, 2009
Published version from CERN: PDF;
In : Workshop on Accelerator Magnet Superconductors, Design and Optimization, CERN, Geneva, Switzerland, 19 - 23 May 2008, pp.78-82 (CERN-2009-001)
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10.
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Present Status and Future Perspectives for Nisheathed $MGN_{2}$ Superconducting Tapes
/ Grasso, G ; Malagoli, A ; Tumino, A ; Fanciulli, C ; Nardelli, D ; Bernini, C ; Vignolo, M ; Braccini, V ; Federghini, C ; Siri, A S et al.
2005
Published version from CERN: PDF;
In : Workshop on Accelerator Magnet Superconductors, Archamps, France, 22 - 24 Mar 2004, pp.155-161
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