CERN Accelerating science

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1.
Length Changes of Unconfined Nb3Sn 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
2.
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 Nb3Sn superconductors. This technology requires reaction heat treatment (RHT) of the magnet coils, during which Nb3Sn 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;
3.
Longitudinal and Transverse Dimensional Changes During Heat Treatment of the Nb3Sn Cables for the Graded Research Racetrack Dipole Demonstrator (R2D2) / Mora, E Fernandez (IRFU, Saclay ; CERN) ; Durante, M (Saclay) ; Perez, J C (CERN) ; Rochepault, E (Saclay) ; Rondeaux, F (Saclay)
The Research Racetrack Dipole Demonstrator (R2D2) is a Nb3Sn graded magnet developed in the framework of the CEA-CERN collaboration with the goal to assess key technologies for future high field accelerator magnets. This demonstrator magnet features two 1.7 m long racetrack coils, designed in the graded configuration needed for compact and efficient high field magnets. [...]
2024 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 8800505 Fulltext: PDF;
4.
Onset of Mechanical Degradation due to Transverse Compressive Stress in Nb3Sn 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 Nb3Sn 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. Nb3Sn 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
5.
Heat Treatment Optimization of Rutherford Cables for a 15-T Nb3Sn 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 Nb3Sn 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
6.
Dimensional Changes of Nb3Sn 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, Nb3Sn coils undergo a heat treatment step after winding. During this stage, coils radially expand and longitudinally contract due to the Nb3Sn 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
7.
Study on the Thermal Contraction Behavior of State-of-the-Art Nb3Sn Superconducting Magnet Coils in the Longitudinal, Azimuthal, and Radial Direction / Höll, Stefan (CERN) ; Guinchard, Michael (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Frutos, Óscar Sacristán De (CERN)
To meet the requirements of the HL-LHC upgrade in terms of stronger magnetic fields, the new focusing MQXF quadrupoles make use of the enhanced superconducting properties of  Nb3Sn compared to its predecessor NbTi. However, the change in material leads to an increased brittleness and strain sensitivity of the magnet coils, which raises the importance of an adequate mechanical design to guarantee the performance of the magnet. [...]
2024 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4003006
8.
Transient heat transfer in superfluid helium cooled Nb3Sn superconducting coil samples / Xavier, Mário D Grosso (CERN) ; Schundelmeier, Jens (CERN) ; Winkler, Tiemo (CERN) ; Koettig, Torsten (CERN) ; van Weelderen, Rob (CERN) ; Bremer, Johan (CERN)
An experimental setup is operational at the Central Cryogenics Laboratory of the European Organization for Nuclear Research to measure the cooling mechanisms of superfluid 4He (He II) from prepared Rutherford-type superconducting cable stacks to a stagnant He II bath. For novel magnets designed for the so-called high-luminosity large hadron collider upgrade, a segment of a fully impregnated Nb3Sn 11T dipole magnet was measured. [...]
2019 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 9500105
9.
Thermomechanical Behavior of the HL-LHC 11 Tesla Nb3Sn 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
10.
Irreversible degradation of Nb3Sn 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 Nb3Sn 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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