Technological advances in Superconducting magnet system of SST-1

Refurbishment of SST-1 has been taken up as a time bound mission to overcome the technological difficulties encountered during the last assembly and commissioning in October 2006. Various technologies related with sixteen toroidal field (TF) and poioidai field (PF) superconducting magnets have evolved by prototyping, laboratory validation and testing on spare TF coil Low resistance inter-pancake (IP) joint and inter-coil(IC) termination fabrication, leak tight joint box implementation and its welding, insulation strengthening, joint box electromagnetic support, hydraulic manifold welding are the technologies related with TF and PF superconducting magnets. More than one hundreds of IP joints have been fabricated and tested at 5K with 10kA current. The electrical resistance of IP joint is found to be lesser than 0.5 nano-ohms (nΩ). Performances of electrical insulation integrity and leak tightness of joint boxes and hydraulic tubing have also been verified at 5K and DC transport current of 10kA. Joint fabrication, joint box welding and insulation were carried out under various strict quality control processes. TF coil fabrication related tasks begun in February 2010 and were completed in September 2010. Joint fabrication, joint box and associated welding, electrical insulation strengthening, 5K panel integration and their tests at room temperature and at 5K are discussed in this paper. QA processes related with all technologies are also discussed in this paper.