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Length Changes of Unconfined Nb$_3$Sn Rutherford Cables During Reaction Heat Treatment
/ Michels, Matthias (CERN) ; Lackner, Friedrich (CERN) ; Scheuerlein, Christian (CERN) ; Carlon Zurita, Alejandro (CERN) ; Ferradas Troitino, Salvador (CERN) ; Bourcey, Nicolas (CERN) ; Savary, Frederic (CERN) ; Tommasini, Davide (CERN)
In order to predict volume changes of Nb3Sn coils during reaction heat treatment (RHT), coefficients of thermal expansion (CTE) of the involved materials need to be known. While the CTEs of bulk materials are widely available, there is a lack of knowledge about the dimensional changes of the Nb3Sn Rutherford cables. [...]
2019 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 29 (2019) 6000605
In : Applied Superconductivity Conference 2018, Seattle, United States Of America, 28 Oct - 2 Nov 2018, pp.6000605
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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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Onset of Mechanical Degradation due to Transverse Compressive Stress in Nb$_3$Sn Rutherford-Type Cables
/ Puthran, K (CERN ; Karlsruhe U., ITP) ; Barth, C (CERN) ; Ballarino, A (CERN) ; Devred, A (CERN) ; Arndt, T (Karlsruhe U., ITP)
In the framework of the High Field Magnets program at CERN, lower limits of degradative mechanical loads on reacted and impregnated Nb$_3$Sn Rutherford-type cables are being studied with the goal of optimizing the pre-stress applied at room temperature on the accelerator magnets. Coils are loaded during assembly, for instance when transverse load is applied by using a collaring press or the bladder and key technique. Nb$_3$Sn is susceptible to transverse compressive stress, which is the loading condition investigated for this study. [...]
2023 - 6 p.
- Published in : IEEE Trans. Appl. Supercond. 33 (2023) 8400406
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Heat Treatment Optimization of Rutherford Cables for a 15-T Nb$_3$Sn Dipole Demonstrator
/ Barzi, Emanuela (Fermilab) ; Bossert, Marianne (Fermilab) ; Field, Michael (Fermilab) ; Li, Pei (Fermilab) ; Miao, Hanping (Fermilab) ; Parrell, Jeff (Fermilab) ; Turrioni, Daniele (Fermilab) ; Zlobin, Alexander V (Fermilab)
/HighFled Magnets Collaboration
Fermi National Accelerator Laboratory has been developing a 15-T Nb$_3$Sn dipole demonstrator for a future very high energy pp collider based on an optimized 60-mm aperture four-layer “cos-theta” coil. To increase the magnet efficiency, the coil was graded by using two cables with same 15 mm width and different thicknesses made of two different restacked rod process (RRP) wires. [...]
FERMILAB-CONF-16-607-TD.-
2017 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4802905
Fulltext: PDF;
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4802905
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Dimensional Changes of Nb$_{3}$Sn Rutherford Cables During Heat Treatment
/ Rochepault, E (CERN) ; Ferracin, P (CERN) ; Ambrosio, G (Fermilab) ; Anerella, M (Brookhaven) ; Ballarino, A (CERN) ; Bonasia, A (CERN) ; Bordini, B (CERN) ; Cheng, D (LBL, Berkeley) ; Dietderich, D R (LBL, Berkeley) ; Felice, H (LBL, Berkeley) et al.
In high field magnet applications, Nb$_{3}$Sn coils undergo a heat treatment step after winding. During this stage, coils radially expand and longitudinally contract due to the Nb$_{3}$Sn phase change. [...]
FERMILAB-PUB-16-055-TD.-
2016 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 26 (2016) 4802605
Fulltext: PDF;
In : 24th International Conference on Magnet Technology, Seoul, Korea, 18 - 23 Oct 2015, pp.4802605
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Thermomechanical Behavior of the HL-LHC 11 Tesla Nb$_{3}$Sn Magnet Coil Constituents during Reaction Heat Treatment
/ Scheuerlein, C. (CERN) ; Lackner, F. (CERN) ; Savary, F. (CERN) ; Rehmer, B. (BAM, Berlin) ; Finn, M. (BAM, Berlin) ; Meyer, C. (BAM, Berlin)
The knowledge of the temperature induced changes of the superconductor volume, and of the thermo-mechanical behaviour of the different coil and tooling materials is required for predicting the coil geometry and the stress distribution in the coil after the Nb3Sn reaction heat treatment. In the present study we have measured the Young's and shear moduli of the HL-LHC 11 T Nb3Sn dipole magnet coil and reaction tool constituents during in situ heat cycles with the dynamic resonance method. [...]
arXiv:1711.07022.-
2018-01-12 - 6 p.
- Published in : IEEE Trans. Appl. Supercond.
Fulltext: PDF;
In : 25th International Conference on Magnet Technology, Amsterdam, The Netherlands, 27 Aug - 1 Sep 2017, pp.8400506
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Irreversible degradation of Nb$_3$Sn Rutherford cables due to transverse compressive stress at room temperature
/ Ebermann, Patrick (CERN ; Vienna, Tech. U., Atominst.) ; Bernardi, Johannes (Vienna, Tech. U.) ; Fleiter, Jerome (CERN) ; Lackner, Friedrich (CERN) ; Meuter, Florian (CERN) ; Pieler, Magdalena (Vienna, Tech. U.) ; Scheuerlein, Christian (CERN) ; Schoerling, Daniel (CERN) ; Wolf, Felix (CERN ; T.U. Bergakademie Freiberg) ; Ballarino, Amalia (CERN) et al.
In the framework of the Future Circular Collider design study for a 100 TeV circular collider, 16 T superconducting bending magnets based on Nb$_3$Sn technology are being developed. A pre-stress on the conductor during magnet assembly at room temperature (RT) is needed to counteract the Lorentz forces during operation. [...]
2018 - 10 p.
- Published in : Supercond. Sci. Technol. 31 (2018) 065009
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