Multi-scale nonlinear stress analysis of Nb₃Sn superconducting accelerator magnets

Summary

This paper presents a multi-scale nonlinear finite-element procedure for stress analysis in Nb₃Sn superconducting accelerator magnets, addressing stress management as a critical challenge in high-field magnet development. The methodology incorporates measured stress–strain curves and models the complex behaviour of gasket materials (insulation layers) and Hill orthotropic materials (resin-impregnated cables) under combined loading conditions. The procedure enables detailed prediction of performance degradation and is applicable to the design of various magnet types including LTS, HTS, and room-temperature magnets, as well as other composite structures.

UK applicability

This work is not directly applicable to UK agricultural, soil health, or food systems research. The record appears to have been catalogued in error within Vitagri's Pulse Brain, which focuses on farming systems and food security.

Key measures

Compressive azimuthal stresses in cables; area-weighted average axial strains in strands; overall performance degradation metrics of Nb₃Sn coils

Outcomes reported

The study developed and demonstrated a multi-scale nonlinear procedure for analysing stress in Nb₃Sn superconducting accelerator magnets under preload, cool-down, and Lorentz forces. The procedure computed compressive azimuthal stresses and axial strains to assess stress-induced and strain-induced performance degradation of the magnet coils.

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