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Mechanical analysis of the Nb$_3$Sn 11 T dipole short models for the High Luminosity Large Hadron Collider
/ Izquierdo Bermudez, S (CERN) ; Nilsson, E (CERN) ; Bottura, L (CERN) ; Bourcey, N (CERN) ; Devred, A ; Ferracin, P (CERN) ; Ferradas Troitino, S (CERN) ; Fiscarelli, L (CERN) ; Guinchard, M (CERN) ; Löffler, C (CERN) et al.
For the Large Hadron Collider luminosity upgrade, two of the NbTi 8.3 T main bending dipoles will be replaced by two shorter Nb$_3$Sn 11.2 T dipoles to create space for the installation of collimators in the dispersion suppression region. With the aim to verify the design features, several 2 m long 11 T models have been constructed and tested at CERN. [...]
2019 - 18 p.
- Published in : Supercond. Sci. Technol. 32 (2019) 085012
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Mechanical analysis of the collaring process of the 11 T dipole magnet
/ Ferracin, Paolo (CERN) ; Bottura, Luca (CERN) ; Bourcey, Nicolas (CERN) ; Daly, Michael (CERN) ; Devred, Arnaud (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Ferradas Troitino, Jose (CERN) ; Ferradas Troitino, Salvador (CERN) ; Grosclaude, Philippe (CERN) ; Guinchard, Michael (CERN) et al.
As part of the Large Hadron Collider (LHC) accelerator upgrades foreseen by the high luminosity-LHC project, the CERN 11 T program is aimed at replacing standard LHC Nb-Ti main dipole magnets, operating with a bore field of 8.3 T, with pairs of shorter Nb$_3$Sn dipole magnets with a bore field of 11 T and the same total integrated field, thus providing space for additional collimators in the dispersion suppressor region. At the time of the submission of this paper, six single-aperture and two double-aperture short models have been fabricated and tested. [...]
2019 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4002705
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Quench propagation in Nb$_{3}$Sn cos-theta 11 T dipole model magnets in high stress areas
/ Mangiarotti, Franco J (CERN) ; Willering, Gerard P (CERN) ; Bajas, Hugues (CERN) ; Bajko, Marta ; Bordini, Bernardo (CERN) ; Bottura, Luca (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Löffler, Christian H (CERN) ; Gomez, Jose V Lorenzo ; Savary, Frederic (CERN) et al.
A large number of training quenches at various currents, temperatures, and ramp rates, have been performed on six 11 T dipole model magnets. Quenches in the midplane of these magnets were of special interest, since the quench current in the last three models measured in 2016 was limited to between 84% and 92% of the magnets short sample limit. [...]
2018 - 4 p.
- Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4008204
Fulltext: PDF;
In : 13th European Conference on Applied Superconductivity, ICCG, Geneva, Switzerland, 17 - 21 Sep 2017, pp.4008204
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Finite Element Analysis of the Mechanical Conditions of the Nb$_3$Sn Cable of the 11 T Dipole Magnet During Operation
/ Löffler, Christian (CERN) ; Daly, Michael (CERN) ; Nilsson, Emelie (CERN) ; Savary, Frederic (CERN)
The development of the 11 T Dipole for the Dispersion Suppressor Collimators (DS11T) for the HiLumi LHC Project at CERN is nearly completed for the RRP conductor route. The DS11T magnet has a cosine theta 60-mm bore design with a removable pole, 56 turns, five wedges, and six coil blocks per quadrant. [...]
2018 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4008105
In : 13th European Conference on Applied Superconductivity, ICCG, Geneva, Switzerland, 17 - 21 Sep 2017, pp.4008105
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Comparison of Cold Powering Performance of 2-m-Long Nb$_{3}$Sn 11 T Model Magnets
/ Willering, Gerard (CERN) ; Bajko, Marta (CERN) ; Bajas, Hugues (CERN) ; Bordini, Bernardo (CERN) ; Bottura, Luca (CERN) ; Feuvrier, Jerome (CERN) ; Fiscarelli, Lucio (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Loffler, Christian (CERN) ; Mangiarotti, Franco (CERN) et al.
For the upgrade of the LHC, two 15-m NbTi main dipole magnets are foreseen to be replaced by two 11 T 5.7-m-long Nb$_{3}$Sn dipoles each. A series of model magnets has been produced to verify the design choices that are important for the prototype and series production, focusing on mechanical aspects and protection studies. [...]
2018 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4007205
In : 25th International Conference on Magnet Technology, Amsterdam, The Netherlands, 27 Aug - 1 Sep 2017, pp.4007205
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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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Design and Construction of the Full-Length Prototype of the 11-T Dipole Magnet for the High Luminosity LHC Project at CERN
/ Savary, Frederic (CERN) ; Bordini, Bernardo (CERN) ; Fiscarelli, Lucio (CERN) ; Foussat, A P (CERN) ; Grand-Clement, Ludovic (CERN) ; Lackner, Friedrich (CERN) ; Loffler, C H (CERN) ; Semeraro, Michela (CERN) ; Smekens, David (CERN) ; Duarte Ramos, Delio (CERN) et al.
The luminosity upgrade of the Large Hadron Collider (LHC) at CERN requires the installation of additional collimators in the dispersion suppressor regions of the accelerator. The upgrade foresees the installation of one additional collimator on either side of interaction point 7 (IP7) at the location of the existing main dipoles (MBs) that will be replaced by shorter and more powerful dipoles, and of one additional collimator on either side of IP2 at the location of existing empty cryostats. [...]
2018 - 6 p.
- Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4007106
In : 25th International Conference on Magnet Technology, Amsterdam, The Netherlands, 27 Aug - 1 Sep 2017, pp.4007106
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Design Optimization of the $Nb_3Sn$ 11 T Dipole for the High Luminosity LHC
/ Nilsson, Emelie (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Ballarino, Amalia (CERN) ; Bordini, Bernardo (CERN) ; Bottura, Luca (CERN) ; Fleiter, Jerome (CERN) ; Lackner, Friedrich (CERN) ; Loffler, Christian (CERN) ; Perez, Juan Carlos (CERN) ; Prin, Herve (CERN) et al.
Abstract: As a part of the large hadron collider luminosity upgrade (HiLumi-LHC) program, CERN is planning to replace some of the 8.33-T 15-m-long Nb-Ti LHC main dipoles with shorter 11 T Nb$_{3}$Sn magnets providing longitudinal space for additional collimators. Whereas the present design of the 11 T dipole enables the use of RRP conductor with critical current degradation after cabling at the level of 5%, new cross sections of the cable have been studied in order to further decrease the degradation of both critical current and resistivity of the copper matrix. [...]
2017 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4001005
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4001005
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Cold Powering Performance of the First 2 m $Nb_3Sn$ DS11T Twin-Aperture Model Magnet at CERN
/ Willering, G P (CERN) ; Bajko, M (CERN) ; Bajas, H (CERN) ; Bordini, B (CERN) ; Bottura, L (CERN) ; Feuvrier, J (CERN) ; Fiscarelli, L (CERN) ; Guinchard, M (CERN) ; Izquierdo Bermudez, S (CERN) ; Karppinen, M (CERN) et al.
Abstract: For the upgrade of the LHC during the long shutdown 2 and for the HL-LHC upgrade during the long shutdown 3, a few 15 m 8.3 T Nb-Ti main dipole magnets are foreseen to be replaced by two 11 T $Nb_3Sn$ dipoles, 5.5 m long each. After the production and test of three single aperture models at CERN, the first 2-m-long twin-aperture model has been tested. [...]
2017 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4002505
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4002505
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