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Weak acid leaching of MgB$_2$ to purify magnesiothermic boron powder
/ Capra, Marco (Genoa U.) ; Bovone, Gianmarco (CNR, Italy) ; Loria, Federico (CNR, Italy) ; Bernini, Cristina (CNR, Italy) ; Hopkins, Simon C (CERN) ; Ballarino, Amalia (CERN) ; Tropeano, Matteo (ASG Supercond., Genova) ; Tumino, Andrea (ASG Supercond., Genova) ; Grasso, Gianni (ASG Supercond., Genova) ; Ferdeghini, Carlo (CNR, Italy) et al.
We have established a new procedure for recovering boron contained in oxidized MgB$_2$ phase. Incorrect conditions of synthesis or conservation, or excess impurities in precursors, can lead to MgO formation with consequent degradation of superconducting properties, thus representing a possible problem in the industrial production of MgB$_2$ conductors following the ex-situ PIT process. [...]
2021
- Published in : Materials Today Communications 26 (2021) 101731
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2.
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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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Reverse advance internal magnesium diffusion process to produce dense MgB$_{2}$ bulks and high $J$$_{C}$ wires through high pressure heat treatment
/ Bovone, G. (U. Genoa) ; Capra, M. (U. Genoa) ; Bernini, C. (Genoa U.) ; Loria, F. (U. Genoa) ; Cetner, T. (Warsaw, Inst. Phys.) ; Gajda, D. (Wroclaw, Inst. Low Temp.) ; Morawski, A. (Warsaw, Inst. Phys.) ; Ballarino, A. (CERN) ; Hopkins, S. C. (CERN) ; Tropeano, M. (ASG Supercond., Genova) et al.
Here we report a new versatile technique to manufacture MgB$_{2}$ massive samples, called reverse advance internal magnesium diffusion (r-AIMI). The idea focuses on the goal of obtaining dense bulk or wire samples depending on synthesis conditions. [...]
2020 - 8 p.
- Published in : Supercond. Sci. Technol. 33 (2020) 125003
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4.
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Characterization of Freeze-Dried Boron Nanopowders and Parameter Optimization in Ex Situ MgB2 Wire Production
/ Capra, Marco (U. Genoa ; CNR-SPIN, Naples) ; Bovone, Gianmarco (CNR-SPIN, Naples) ; Loria, Federico (CNR-SPIN, Naples) ; Bernini, Cristina (CNR-SPIN, Naples) ; Tropeano, Matteo (ASG Supercond., Genova) ; Tumino, Andrea (ASG Supercond., Genova) ; Grasso, Gianni (ASG Supercond., Genova) ; Hopkins, Simon C (CERN) ; Ballarino, Amalia (CERN) ; Ferdeghini, Carlo (Genoa U.) et al.
This article reports a study to identify optimal synthesis parameters for a pure boron precursor prepared following a patented process developed at CNR-SPIN laboratories, performed in the framework of a collaboration between CNR-SPIN and CERN. Boron is a precursor that plays a crucial role in the MgB2wire manufacturing, as a consequence, the synthesis parameters of the superconducting phase have been investigated. [...]
2021 - 7 p.
- Published in : IEEE Trans. Appl. Supercond. 31 (2021) 6200107
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5.
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Future Circular Collider beam screen: progress on Tl-1223 HTS coating
/ Leveratto, A (Genoa U.) ; Saba, A (Genoa U. ; Genoa U.) ; Holleis, S (Vienna, Tech. U., Atominst.) ; Himmerlich, M (CERN) ; Henrist, B (CERN) ; Fernandez-Peña, S (CERN) ; Moros, A (Vienna U.) ; Bernardi, J (Vienna U.) ; Eisterer, M (Vienna, Tech. U., Atominst.) ; Bernini, C (Genoa U.) et al.
Thallium-1223, a superconductor with high critical temperature (T c ∼ 120 K) and high irreversibility line is a promising alternative to copper layers as a low surface impedance material in particle accelerator components. In the existing design of the Future Circular Collider (FCC-hh), for reasons of cryogenic efficiency and vacuum stability, the beam screen that shields the dipoles from synchrotron radiation has to stay at best in the temperature range between 40 and 60 K, in which copper surface resistance might be too high to prevent beam instabilities due to wakefields. [...]
2020 - 7 p.
- Published in : Supercond. Sci. Technol. 33 (2020) 054004
Fulltext: PDF;
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6.
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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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7.
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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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8.
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Thallium-based high-temperature superconductors for beam impedance mitigation in the Future Circular Collider
/ Calatroni, S (CERN) ; Bellingeri, E (CNR-SPIN, Naples) ; Ferdeghini, C (CNR-SPIN, Naples) ; Putti, M (CNR-SPIN, Naples ; Genoa U.) ; Vaglio, R (CNR-SPIN, Naples ; INFN, Naples ; Naples U.) ; Baumgartner, T (Vienna, Tech. U., Atominst.) ; Eisterer, M (Vienna, Tech. U., Atominst.)
CERN has recently started a design study for a possible next-generation high-energy hadron–hadron collider (Future Circular Collider—FCC-hh). The FCC-hh study calls for an unprecedented center-of-mass collision energy of 100 TeV, achievable by colliding counter-rotating proton beams with an energy of 50 TeV steered in a 100 km circumference tunnel by superconducting magnets which produce a dipole field of 16 T. [...]
2017 - 7 p.
- Published in : Supercond. Sci. Technol. 30 (2017) 075002
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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