Assembly, integration and dimensional control of the steady state tokamak SST-1

SST-1 is a large aspect ratio tokamak designed for steady state operation, configured to run a double/single null, elongated triangular plasma, which is under construction in India. It has a major radius of 1.1 m with plasma minor radius of 0.2 m, with maximum toroidal magnetic field 3 Tesla at the plasma center. SST-1 tokamak has a large number of components to be assembled at site to build various systems like machine support structure, plasma chamber, cryostat, magnet system, first wall (PFC) and other auxiliary systems. In this device the required assembly tolerances are in the order of several tenth of a millimeter. The tight installation tolerances, definite assembly sequences and process restrictions govern the efficacy of the assembly procedures. SST-1 assembly demands definite sequence to be followed to ensure sequential testing of each system, accurate positioning of the components in the radial, toroidal, poloidal and vertical direction to meet the tolerances and magnetic axis determination and alignment of the plasma facing components.