TPX TF MAGNET STRUCTURE DESIGN

The design of the Tokamak Physics Experiment (TPX) utilized 16 superco nducting Toroidal Field (TF) magnet coils supported by a wedged struct ure. The TF magnet structure supports and locates the Poloidal Field ( PF) coils and must restrain the twisting and expansion forces generate d by the interaction of currents and magnetic fields. This structure m ust also leave significant open space to permit access to the plasma c hamber. The geometry and alignment of the magnet structural components must be controlled to meet very tight tolerances with respect to the operating toroidal magnetic field errors. During the Preliminary Desig n Phase, the TPX TF magnet structure configuration was revised from a welded and bolted field assembly to one utilizing bolted joints only. These electrically insulated joints were specifically designed for eas e of assembly and to provide the flexibility to adjust coil alignments at assembly to accommodate for manufacturing tolerance stackups. We r eport on the final Preliminary Design which meets all project design r equirements.