The presentation details the scale and ambition of the ITER project, a collaboration of eight international partners and 33 countries. Originating from a 1985 summit between Reagan and Gorbachev, it aims to be the first device to produce a net energy gain (Q=10) and demonstrate the integrated technologies required for a fusion power plant.
Beyond ITER, national programs like the UK's STEP (Spherical Tokamak for Energy Production) are exploring alternative, potentially more economical designs. STEP focuses on a compact, spherical tokamak, aiming to deliver a complete prototype power plant that demonstrates a closed tritium fuel cycle and commercial viability by the 2040s.
Achieving stable fusion requires overcoming immense physics challenges. This includes heating plasma to 100 million degrees, maintaining a 'high-confinement mode' (H-mode) for efficiency, and mitigating instabilities like Edge Localized Modes (ELMs) which release damaging bursts of energy.
The engineering of a fusion reactor is as challenging as the physics. Key problems include designing an exhaust system (divertor) that can withstand heat loads greater than a re-entering space capsule, minimizing wall material (tungsten) contamination of the plasma, and developing fully robotic systems for maintenance.
Keep pulling the thread on Ronald Reagan.