The Naka Joint Work Site is hosted by the Japan Atomic Energy Research Institute at Naka, about 80 km north of Tokyo.

This site is responsible for physics integration and diagnostics, and for maintaining the design and preparing the procurement documentation for the ex-vessel components, including:

superconducting coils and structures, power supplies, plasma control, neutral beam heating and current drive, cryostat, thermal shields, reactor hall layout, remote handling, tokamak water cooling, cryoplant, and tritium plant;

all interfaces required for the integration of ex-vacuum vessel components, and remote maintenance systems and components, into the global project, including interfaces with the vacuum vessel, vacuum pumping systems, heat rejection system, and control systems;

development and implementation of any remaining manufacturing R&D and design activities required for the above, in conjunction with the Participant Teams, including definition of tasks, active interaction and monitoring of technical progress, and evaluation of results.

The Acting Head of the Naka ITER Joint Work Site is Dr. Neil Mitchell.