Quenches and resulting thermal and mechanical effects on epoxy impregnated Nb3Sn high field magnets

Thermal deformation and resulting mechanical stress due to quenches inside epoxy-impregnated Nb₃Sn high field magnets are studied with a combination of a quench simulation program, and the ANSYS program. We use the geometry of the high field cosine theta type dipole magnets with one meter and 10 meter length. The turns where quenches start are heated excessively, up to 100 K to 300 K, depending on the coil length and time delay. The non-quenching turns and surrounding material are not heated substantially. This large temperature gradient causes high local stress in the quenching conductors and their insulation material. The ANSYS program is used to calculate this response