Starlight Engine (SLE) and Kyoto Fusioneering (KF) have completed the conceptual design for Japan’s privately-led FAST (Fusion by Advanced Superconducting Tokamak) power demonstration plant, reaching the project’s first major milestone one year after its launch in November 2024.

The partners have released a Conceptual Design Report (CDR) that sets out FAST’s objectives, required performance, system configuration, feasibility, costs and construction schedule. It is the first CDR in Japan prepared for a privately-led fusion power demonstration in line with the government’s Fusion Energy Innovation Strategy.

FAST is a low-aspect-ratio tokamak designed to generate and sustain deuterium-tritium-burning plasma, targeting around 50MW of fusion output using neutral beam injection heating in a device comparable to the JT‑60SA tokamak. The project aims to demonstrate an integrated fusion power system, combining energy conversion, tritium breeding and fuel cycle technologies, and remote maintenance at a scale relevant to commercial plants.

Read more in Power Technology here.

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