Pre-Load Studies on a 2-m Long Nb<sub>3</sub>Sn 11 T Model Magnet for the High Luminosity Upgrade of the LHC

Gautheron, Emma; Bordini, B.; Bourcey, Nicolas; Sequeiro, Cristina Castro; Devred, A.; Duda, Michał; Guinchard, Michael; Bermúdez, Susana Izquierdo; Lackner, F.; Pérez, Juan Carlos; Pincot, Francois-Olivier; Pulikowski, D.; Fernández, José Luis Rudeiros; Savary, F.; Willering, Gerard

doi:10.1109/tasc.2021.3066114

Cited by 1 publication

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“…3). This approach, which is similar to 2-D modelling strategies used by other authors [18], [19], offers several advantages compared to a fully homogenized model of the cable [20], in particular: (i) an inherently orthotropic cable behavior is obtained albeit using homogeneous, isotopic material models for both phases, which, in turn, (ii) greatly simplifies the treatment of orthotropic plasticity, complex to derive [15] and introduce in standard FE tools such as Ansys [16]. On the other hand, adopting a more detailed cable model, e.g., featuring single strands [17], [18], though attractive to study the local stress state in the conductor, would have been impractical to simulate complex 3-D geometries such as in a magnet collared coil.…”

Section: B Materials Constitutive Laws For Rutherford Cablementioning

confidence: 92%

A Combined Testing and Modelling Methodology for the Mechanics of High-Field Superconducting Magnets

Bertarelli,

Guinchard,

Holko

et al. 2024

IEEE Trans. Appl. Supercond.

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The use of superconducting composite cables based on Nb 3 Sn, an intermetallic compound of Niobium and Tin, is one of the favorite routes to reach magnetic fields higher than 10 T in state-of-the-art accelerator magnets. The brittle and nonlinear nature of the epoxy-impregnated Nb 3 Sn Rutherford cable makes challenging to predict its mechanical limits and, consequently, the overall performance of the magnet. In the case of collared magnet structures, peak stresses in coils are usually reached during the collaring procedure performed at room temperature. Hence, it is essential to extensively study stress distribution within the superconducting coils and at their interfaces with other components during this phase. In this context, a combined experimental/numerical methodology was developed at CERN to investigate the effects of the assembling process and geometrical imperfections on the mechanical response of the collared coil of the 11 T HL-LHC dipole. The results of the experimental tests were benchmarked against 3-D non-linear finite element models, using material constitutive laws that mimicked the non-linear responses of the Nb 3 Sn cable, and embedding geometrical imperfections as measured on the tested components. The proposed methodology, used in the early stages of superconducting magnets development, may help to identify limitations in the mechanical design, and understand the impact of geometrical imperfections and tolerances on stress distribution in the magnet structures.

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Section: B Materials Constitutive Laws For Rutherford Cablementioning

confidence: 92%

A Combined Testing and Modelling Methodology for the Mechanics of High-Field Superconducting Magnets

Bertarelli,

Guinchard,

Holko

et al. 2024

IEEE Trans. Appl. Supercond.

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Pre-Load Studies on a 2-m Long Nb₃Sn 11 T Model Magnet for the High Luminosity Upgrade of the LHC

Cited by 1 publication

References 19 publications

A Combined Testing and Modelling Methodology for the Mechanics of High-Field Superconducting Magnets

A Combined Testing and Modelling Methodology for the Mechanics of High-Field Superconducting Magnets

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Pre-Load Studies on a 2-m Long Nb3Sn 11 T Model Magnet for the High Luminosity Upgrade of the LHC

Cited by 1 publication

References 19 publications

A Combined Testing and Modelling Methodology for the Mechanics of High-Field Superconducting Magnets

A Combined Testing and Modelling Methodology for the Mechanics of High-Field Superconducting Magnets

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Pre-Load Studies on a 2-m Long Nb₃Sn 11 T Model Magnet for the High Luminosity Upgrade of the LHC