Development and testing of high field, high current density solenoids and magnets, wound with stabilized filamentary Nb/sub 3/Sn cable and reacted after winding

The development and testing of a 2.6 cm inner diameter, high field and high current density solenoid, wound with a Cu-stabilized, fine filamentary Nb/sub 3/Sn cable, and reacted after winding, is described. At an overall current density in the winding of 352 A/mm /sup 2/, corresponding to the current density of 565 A/mm/sup 2/ in the non-insulated cable, a maximum field of B/sub m/=8.8 T had been obtained without any training. Based on this result, a 0.9 m-long, 10 cm-warm bore, beam line quadrupole magnet, wound with the same cable, is being assembled. The nominal parameters are: field gradient 74 T/m, maximum field in the winding B/sub m/=7.4 T at an overall current density in the winding of 300 A/mm/sup 2/. The specific technological and design aspects of this magnet, related to the 'wind and react' technique, such as the conductor insulation, coil winding technique, execution of connections etc., are discussed. (2 refs).