Abstract
This paper describes the design, construction and testing of the high field and large bore Nb-Ti solenoid wound by a technique without cooling channel for the purpose of having both high current density and mechanical rigidity. The first quenching current after the winding was the short sample value, 900A at 9.3T on the conductor, and no degradation was found after a lot of quenchings. The solenoid can be stably operated up to 8.5T of the central field, as designed, during short sample tests in the bore. The performance of this magnet is well above the statistical curve of superconducting magnet technology by M. S. Lubell.
