The TPX cryostat conceptual design

The TPX (Tokamak Physics Experiment) will be the first tokamak to employ both superconducting TF (toroidal field) and PF (poloidal field) magnets. Consequently, the entire device is located within an evacuated cryostat to provide the necessary thermal barrier between the ambient temperature test cell and the magnets that are cooled by supercritical liquid helium at 5/spl deg/K. This paper describes the cryostat design requirements, design concepts, and the cryostat fabrication and installation.