Nb3Sn Accelerator Magnet Technology Scale Up Based on Cos-Theta Coils

After successful testing of a 1 m long dipole mirror magnet and three dipole models based on two-layer Nb₃Sn coils, Fermilab has started a Nb₃Sn technology scale-up program using the dipole mirror design and the developed Nb₃Sn coil fabrication technology based on the wind-and-react method. The scale-up will be performed in several steps starting from a 2 m long coil made of powder-in-tube (PIT) strand. This will be followed by 4 m long Nb₃Sn coils made of PIT and RRP strands that will be fabricated into dipole mirror magnets and tested. This paper presents a summary of Fermilab´s wind-and-react short model program. It includes details on the 2 m and 4 m long, 2 layer Nb₃Sn dipole mirror magnet design, mechanical structure, and fabrication infrastructure.