Fabrication and assembly of a single turn coil tokamak

Abstract

Summary form only given. The proposed IGNITEX (Texas Fusion Ignition Experiment) concept utilizes single-turn coils for both the toroidal-field (TF) and poloidal-field (PF) systems. The single-turn, TF coil is composed of wedge-shaped, high-strength, copper-alloy plates. The number of plates required is determined by the maximum thickness availability of the conductor material. An existing 0.06-scale prototype, single-turn TF coil uses a beryllium-copper alloy. Radial rings located at the top and bottom of the coil hold the TF assembly together. The TF coil terminals extend radially outward; several plates are connected in parallel to form a sector which is then connected to a HPG (homopolar generator) module. The assembly procedure for the IGNITEX TF coil prevents a stack-up of angular tolerances. Stiffness of the TF coil is simply a function of conductor material and flatness tolerances of the conductor plates. The IGNITEX concept includes a PF coil that is internal to the TF coil. The PF system is single-turn and composed of five pairs of coils, each independently powered by a HPG. Terminations for the PF coils are located at two points, 180° apart. The TF and PF coils are assembled as 180° units and are connected and terminated when the two sections are joined