W7-X Device

The cryostat consists of the plasma vessel, the outer vessel, the ports and the thermal protection.

The inner plasma vessel (in the drawing shown in green) encloses the plasma and follows its helical 3-dimensional shape.

It carries the cooled elements of the first wall on its inner (plasma) side and on its outboard (vacuum) side a specially developed superisolation structure.

The superconducting coil system is assembled between the plasma vessel and the outer vessel, which function as a cryostat keeping the magnet system at crogenic temperature and form the boundary between the main device and the environment.

Access to the plasma vessel from outside as it is required for heating, for cooling the first wall and for diagnostic purposes is possible via one of the 254 ports .