Validation of SST-1 components at low temperature under vacuum environment

Steady-state superconducting Tokamak (SST-1) is currently under refurbishment in a mission mode at Institute for Plasma Research. In this mission, leak tightness of all the cryogenic components of SST-1 under all operational scenarios is evaluated. Cryogenic components include TF coils, 80 K thermal shields, Helium and Nitrogen Manifolds, Isolators, Tubing, Headers etc. Toroidal field (TF) magnets of SST-1 have been refurbished and have been tested in cold condition with current. Leak tightness of the entire superconducting magnets winding-pack including joints and helium manifolds were necessarily to be ensured at room temperature (RT) as well as in cold (∼ 5 K) with and without current. Nearly twenty- five campaigns involving SST-1 TF coils have been made where the vacuum leak tightness was monitored and ensured including those of the partial pressure of the residual gases. This paper will elaborate these experiments including methods adopted at ensuring leak tightness in cold. This paper will elaborate these experiments including methods adopted at ensuring leak tightness in cold condition and Partial pressure measurement during all the campaigns of Coils and other component testing.