THE TPX VACUUM VESSEL AND IN-VESSEL COMPONENTS

The Tokamak Physics Experiment (TPX) is a superconducting tokamak with double-null diverters. TPX is designed for 1000-second discharges wit h the capability of being upgraded to steady state operation. High neu tron yields resulting from the long duration discharges require that s pecial consideration be given to materials and maintainability. A uniq ue feature of the TPX is the use of a low activation, titanium alloy v acuum vessel. Double-wall vessel construction is used since it offers an efficient solution for shielding, bakeout and cooling. Contained wi thin the vacuum vessel are the passive coil system, Plasma Facing Comp onents (PFCs), magnetic diagnostics, and the internal control coils. A ll PFCs utilize carbon-carbon composites for exposed surfaces.