Fabrication of a 3 m diameter x 5 m superconducting solenoid for the Fermilab collider detector facility

The 3m diameter x 5m (1.5 Tesla) superconducting solenoid for the Fermilab Collider Detector Facility (CDF) is under construction in Japan. The coil consists of a single layer aluminum-stabilized monolithic NbTi/Cu superconductor fabricated with the EFT (extrusion with front tension) method. The forced flow cooling method of two-phase helium is used. In order to minimize the material thickness of the solenoid the coil is built without a permanent inner bobbin. The radial electromagnetic forces are supported by an aluminium cylinder placed radially outside the coil. The completed coil wounded on the removable mandrel is shrink-fitted with the support cylinder. Results of development work are presented