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Description
As part of the US Magnet Development Program, Lawrence Berkeley National Laboratory (LBNL) is developing high field stress-managed Nb3Sn dipole magnets using canted-cosine-theta (CCT) technology. A series of epoxy two-layer magnets, CCT3/4/5, with short sample bore field of approximately 10 T and a 90 mm diameter open aperture have been designed, fabricated, and tested. The third and final magnet of this series, CCT5, reached 88% of the short sample current.
Alumina-filled wax was used as impregnation material in a subscale CCT magnet with the same design (4.5 T and 50 mm bore aperture). The magnet was fabricated and tested. It exhibited minimal training with only one quench observed before reaching short sample limit current.
A filled wax impregnated magnet, CCT5-W, that is otherwise identical to CCT5 has been recently fabricated. This paper summarizes the quench performance of the CCT5 wax filled magnet. The effect of the wax impregnation on the stress managed structure and on the conductor performances is also being discussed.
