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CERN Document Server 2,047 elementer funnet  1 - 10nesteslutt  gå til element: Søket tok 0.26 sekunder. 
1.
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Effect of Applied Compressive Stress and Impregnation Material on Internal Strain and Stress State in Nb$_3$Sn Rutherford Cable Stacks / Wolf, Felix (CERN) ; Scheuerlein, Christian (CERN) ; Lorentzon, Marcus (CERN) ; Katzer, Balduin (CERN) ; Hofmann, Michael (Forschungsreaktor Munich) ; Gan, Weimin ; Lackner, Friedrich (CERN) ; Schoerling, Daniel (CERN) ; Tommasini, Davide (CERN) ; Savary, Frederic (CERN) et al.
The Nb3Sn superconductor in accelerator magnets must resist high mechanical stresses. In order to better understand the effect of the coil impregnation system on the stresses exerted on the strain-sensitive Nb3Sn superconductor, we have measured the elastic strain evolution in the conductor constituents under externally applied loads. [...]
2019 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 8400605 Fulltext: PDF;
In : Applied Superconductivity Conference 2018, Seattle, United States Of America, 28 Oct - 2 Nov 2018, pp.8400605
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Direct measurement of Nb$_{3}$Sn filament loading strain and stress in accelerator magnet coil segments / Scheuerlein, C (CERN) ; Wolf, F (CERN) ; Lorentzon, M (CERN) ; Hofmann, M (Forschungsreaktor Munich)
We have directly measured, for the first time, the Nb3Sn and Cu loading strains and stresses in 11 T dipole coil segments upon compressive loading using neutron diffraction. For this purpose a load frame that enables rotation of the sample load axis with respect to the neutron scattering geometry was installed in the Stress-Spec beamline at the Heinz Maier-Leibnitz FRM II neutron source. [...]
2019 - 8 p. - Published in : Supercond. Sci. Technol. 32 (2019) 045011 Fulltext from publisher: PDF;
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3.
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Effect of Epoxy Volume Fraction on the Stiffness of Nb$_3$Sn Rutherford Cable Stacks / Wolf, Felix (CERN) ; Lackner, Friedrich (CERN) ; Hofmann, Michael (Forschungsreaktor Munich) ; Scheuerlein, Christian (CERN) ; Schoerling, Daniel (CERN) ; Tommasini, Davide (CERN)
For the optimization of Nb3Sn superconducting accelerator magnet design and assembly parameters the stress-strain behavior of the coils needs to be known. We have measured the stiffness of Nb3Sn Rutherford cable stacks with different epoxy volume fraction. [...]
2019 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 8401006
In : Applied Superconductivity Conference 2018, Seattle, United States Of America, 28 Oct - 2 Nov 2018, pp.8401006
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4.
(51)
New Methodology to Derive the Mechanical Behavior of Epoxy-Impregnated Nb$_3$Sn Cables / Fichera, Claudio (CERN) ; Bertarelli, Alessandro (CERN) ; Ferracin, Paolo (CERN) ; Guinchard, Michael (CERN) ; Sacristan de Frutos, Oscar (CERN) ; Vallone, Giorgio (CERN)
The Nb3Sn technology plays a crucial role in developing high-field superconducting magnets. The new-generation Nb3Sn cable greatly contributes to bring the magnetic field produced by the superconducting dipole magnets to the 16 T level; nevertheless, its mechanical properties are largely variable, making it difficult to predict the mechanical behavior of the magnet structure. [...]
2019 - 12 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 8401912
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5.
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Multiscale approach to the mechanical behavior of epoxy impregnated Nb$_{3}$Sn coils for the 11 T dipole / Daly, Michael (CERN) ; Loffler, Christian H (CERN) ; Smekens, David (CERN) ; Fontenla, A T (CERN) ; Sacristan De Frutos, Oscar (CERN) ; Guinchard, Michael (CERN) ; Savary, Frederic (CERN)
The superconducting 11 T dipole magnets developed at CERN for the HL-LHC project are equipped with coils manufactured from Nb$_{3}$Sn Rutherford cables and following the wind and react fabrication technique. The brittleness of the multifilamentary structure of the Nb$_{3}$Sn within the cable strands exposes the coils to permanent performance degradation when subjected to excessive strain during assembly and operation. [...]
2018 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4007706
In : 25th International Conference on Magnet Technology, Amsterdam, The Netherlands, 27 Aug - 1 Sep 2017, pp.4007706
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6.
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Computation of the Reversible Critical Current Degradation in Nb $_{3}$Sn Rutherford Cables for Particle Accelerator Magnets / Vallone, Giorgio (CERN) ; Bordini, Bernardo (CERN) ; Ferracin, Paolo (CERN)
Superconducting coils limit current is usually measured on unloaded short samples of strands extracted from the same cable used to wound the coil. However, the critical current density of Nb$_{3}$Sn strands is strongly dependent on the applied strain. [...]
2018 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4801506
In : 13th European Conference on Applied Superconductivity, ICCG, Geneva, Switzerland, 17 - 21 Sep 2017, pp.4801506
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7.
(33)
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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8.
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Characterization of the stress distribution on Nb$_{3}$Sn Rutherford cables under transverse compression / Wolf, Felix (CERN) ; Ebermann, Patrick ; Lackner, Friedrich ; Mosbach, Dennis ; Scheuerlein, Christian ; Schladitz, Katja ; Schoerling, Daniel
Coils of high-field Nb$_{3}$Sn magnets are submitted to large loads during assembly at ambient temperature and during operation at cold. This paper addresses the characterization of the stress distribution on reacted and impregnated Nb$_{3}$Sn Rutherford cables under transverse compression, at ambient temperature, and in a similar configuration as seen during magnet assembly. [...]
2018 - Published in : IEEE Trans. Appl. Supercond. 28 (2018) 8400106
In : 25th International Conference on Magnet Technology, Amsterdam, The Netherlands, 27 Aug - 1 Sep 2017, pp.8400106
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Mechanical characterisation of Nb3Sn Rutherford cable stacks / Wolf, Felix Josef
Nb3Sn Rutherford cables are used in CERN’s superconducting 11 T dipole and MQXF quadrupole magnets, which are proposed for the instantaneous luminosity (rate of particle collisions) upgrade of the Large Hadron Collider (LHC) by a factor of five to a High Luminosity-Large Hadron Collider (HL-LHC).. [...]
CERN-THESIS-2021-140 - 159 p.

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10.
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Metallographic analysis of 11 T dipole coils for High Luminosity-Large Hadron Collider (HL-LHC) / Balachandran, Shreyas (Florida State U.) ; Cooper, Jonathan (Florida State U.) ; Van Oss, Orion B (Columbia U.) ; Lee, Peter J (Florida State U.) ; Bottura, Luca (CERN) ; Devred, Arnaud (CERN) ; Savary, Frederic (CERN) ; Scheuerlein, Christian (CERN) ; Wolf, Felix (CERN)
For next-generation accelerator magnets for fields beyond those achievable using Nb–Ti, Nb3Sn is the most viable superconductor. The high luminosity upgrade for the Large Hadron Collider (HL-LHC) marks an important milestone as it will be the first project where Nb3Sn magnets will be installed in an accelerator. [...]
2021 - 9 p. - Published in : Supercond. Sci. Technol. 34 (2021) 025001 Fulltext from publisher: PDF;
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