I. Introduction
The SST-1 tokamak [1] deploys superconducting magnet system (SCMS) consisting of 16 toroidal field (TF) coils and 9 numbers poloidal field (PF) coils. All the TF coils are connected in series and charged to 10 kA current to obtain the required magnetic field. The PF coils are charged with a defined ramp rate and carry different current values, varying from 1 kA to 9 kA. The power supply system has been designed accordingly to cater to the power requirement of the SCMS. One 10 kA power supply is used for the TF coils, whereas, each PF is charged with an individual power supply. This configuration of the SCMS has generated the requirement of 10 pairs of current leads and 10 pairs of bus bars. It is a challenge to design the current feeder system (CFS) for any large-scale magnet, because the expectation of operation stability and reliability from CFS is very high. The reason being two folds, namely,
Large amount of stored magnetic energies must be extracted through the CFS during emergencies, such as, quench in SCMS or sudden power failure
Large amount of current from power supply to the SCMS has to be transferred without significant energy consumption