{"id":31952,"date":"2025-12-17T09:27:25","date_gmt":"2025-12-17T08:27:25","guid":{"rendered":"https:\/\/educationalevidence.com\/?p=31952"},"modified":"2025-12-18T08:48:01","modified_gmt":"2025-12-18T07:48:01","slug":"iter-the-great-international-experiment-towards-nuclear-fusion","status":"publish","type":"post","link":"https:\/\/educationalevidence.com\/en\/iter-the-great-international-experiment-towards-nuclear-fusion\/","title":{"rendered":"ITER: The great international experiment towards nuclear fusion"},"content":{"rendered":"

The Sun is a main-sequence star and therefore generates its energy through the nuclear fusion of hydrogen nuclei into helium. At its core, it fuses around 620 million metric tonnes of hydrogen every second. \/ Photo: NASA_Wikimedia<\/p>\n

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History, current status, challenges and global competition in the race for the energy of the future<\/h3>\n

License Creative Commons <\/a><\/p>\n

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Michel van Reck<\/a><\/span>\u00a0<\/strong><\/p>\n

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The search for a clean, safe and virtually inexhaustible source of energy has led humanity to explore nuclear fusion<\/strong>, the process that powers the Sun and the stars. At the centre of this endeavour stands ITER<\/strong>\u2014 \u201cjourney\u201d or \u201cpath\u201d in Latin<\/strong>\u2014the largest international scientific experiment designed to demonstrate the viability of fusion as an energy source. ITER is not only a landmark in technological development but also a symbol of global cooperation at a time of growing energy demand and escalating accelerating climate change.<\/p>\n

Fusion power plant concepts rely on achieving plasma confinement<\/strong> under conditions where fusion reactions can take place. Two principal approaches exist: Magnetic Confinement Fusion (MCF) and Inertial Confinement Fusion (ICF). ITER uses an MCF device known as a tokamak, first proposed in 1950 by Soviet physicists Andrei Sakharov and Igor Tamm, based on a toroidal vacuum chamber.<\/p>\n

The origins of ITER can be traced back to the Cold War<\/strong>. In 1985, leaders of the Soviet Union and the United States proposed a joint initiative in fusion research, building on the Soviet tokamak<\/strong> design and inviting Europe and Japan to join. Over subsequent decades, the initiative evolved into a full international consortium that now includes 35 countries, among them the European Union, China, India, Japan, Russia, South Korea and the United States. The formal agreement to construct ITER was signed in 2006, with Cadarache<\/strong> in southern France selected as the site.<\/p>\n

Today, ITER is the largest experimental fusion facility in existence. Construction of the reactor began in 2010. Despite delays and considerable engineering challenges, the project has reached several major milestones. In 2020, assembly of the primary tokamak components began; in 2022, the base of the massive cryostat<\/strong>\u2014the structure that maintains the extremely low temperatures required for the tokamak\u2019s superconducting magnets\u2014was installed. ITER\u2019s principal goal is to achieve a self-sustaining fusion reaction with a power amplification factor (Q) of 10, meaning it would generate ten times the power required to heat the plasma.<\/p>\n

According to the current schedule, first plasma is expected in 2034<\/strong>, with deuterium\u2013tritium (D\u2013T) operation\u2014the stage at which full fusion power testing occurs\u2014planned for 2039<\/strong>.<\/p>\n

ITER nevertheless faces significant obstacles. These challenges are scientific, technological and financial.<\/strong> From a scientific standpoint, sustaining stable plasma confinement for long durations and managing the extreme heat fluxes and high-energy neutron loads generated by fusion reactions remain unresolved. Technologically, the manufacture and integration of components built from unique materials and designs \u2014 true first-of-a-kind<\/em> systems \u2014 require continuous innovation.<\/p>\n

Financially, the project has exceeded its original budget, which has drawn criticism and putting pressure on the project to meet deadlines. The need to coordinate the industrial and scientific contributions of 35 member states also introduces significant complexity in project management, logistics and technology transfer.<\/p>\n

Although ITER is the largest and most prominent fusion experiment, it is far from alone. The race to achieve ignition<\/strong>\u2014the point at which a fusion reaction becomes self-sustaining in energy terms\u2014has attracted major national programmes and private-sector investment, resulting in intense global competition:<\/p>\n