TPX TF magnet structure design

The design of the Tokamak Physics Experiment (TPX) utilized 16 superconducting toroidal field (TF) magnet coils supported by a wedged structure. The TF magnet structure supports and locates the poloidal field (PF) coils and must restrain the twisting and expansion forces generated by the interaction of currents and magnetic fields. This structure must also leave significant open space to permit access to the plasma chamber. 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 design 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 ease of assembly and to provide the flexibility to adjust coil alignments at assembly to accommodate for manufacturing tolerance stackups. We report on the final preliminary design which meets all project design requirements.