Performance of Joints in SST-1 Magnets

Abstract

Novel sub-nano ohm leak tight joints were one of the primary objectives of the refurbishment of Steady State Superconducting Tokamak (SST-1). In total, there are 130 such shake-hand type of joints which have been fabricated on the winding packs of SST-1 Toroidal Field (TF) and Poloidal Field (PF) superconducting magnets. These joints have been validated to be performing per their design specifications in the assembled SST-1 TF and PF magnets during the first cool-down and charging of the assembled and integrated SST-1 superconducting magnet systems. This paper describes the novel aspects of design, process establishments, technology development, testing and qualifications of such joints on the single magnets in both two phase and supercritical flow conditions as well as the joints performances in the assembled SST-1 TF and PF magnets.