ITER is an international nuclear fusion research and engineering project designed to demonstrate the feasibility of fusion power. The facility is under construction near the Cadarache research center in southern France. ITER has been under construction since 2013. It is expected to achieve first plasma in 2033–2034, at which point it will be the world's largest fusion reactor, with a plasma volume about six times that of Japan's JT-60SA, previously the largest tokamak.