Design

THe JT-60SA tokamak consists of the magnets and vacuum vessel. The vessel houses components dedicated to vessel protection, plasma impurity control, plasma position control and fuelling, vacuum pumping and cooling. Diagnostics and heating systems utilise the vessel ports. A cryostat and thermal shield surround the tokamak and protect the superconducting magnets operating at ~4K from heat inleak from the environment and hotter structures. Services are provided for water cooling, cryogenics, power supplies, the control system, as well as heating, ventilation and air conditioning of the building. Due to the eventual activation of structures surrounding the plasma, a remote handling system is included, to be used also to assist in construction. The JT-60SA tokamak is located in the building previously occupied by the JT-60U tokamak, involving dissassembly and recommissioning of some equipment before assembly of the JT-60SA tokamak. Additional safety features are also being added.