Speaker
Description
High field accelerator magnets are being developed for future particle accelerator projects like the Future Circular Collider (FCC). Superconducting magnet coils made of brittle conductors like Nb3Sn are typically impregnated with an epoxy resin, which needs to provide dielectric insulation and mechanical support. Cracking of the impregnation resin under the mechanical loads exerted on the magnet coils during operation can generate superconductor instabilities. The loading stresses in the coil are influenced by the epoxy resin creeping behaviour. We compare the mechanical properties of six epoxy resin systems that can be used for the vacuum impregnation of magnet coils. The same resins have been characterised unfilled and with 33 vol.% S2 glass fibre reinforcement in fibre orientations [0°/90°], [-45°/45°] and [-45°/45°, 0°/90°]. Toughness of the resins is compared based on tensile and flexural stress-strain measurements, and on impact tests carried out at ambient temperature and in liquid nitrogen at 77 K. Creeping and stress relaxation behaviour of the unfilled and glass fibre reinforced epoxy systems have been characterised under uniaxial tensile loading.
Reference:
D.M. Parragh, C. Scheuerlein, R. Piccin, F. Ravotti, G. Pezzullo, D. Ternova, M. Taborelli, M. Lehner, M. Eisterer “Irradiation induced aging of epoxy resins for impregnation of superconducting magnet coils”, IEEE Trans. Appl. Supercond., 34 (3), (2024), Art. no. 7800107
| Submitters Country | Switzerland |
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