The world’s largest nuclear fusion project, the International Thermonuclear Experimental Reactor (ITER), has finished its Central Solenoid magnet system, a crucial part of its Tokamak reactor’s power supply, marking a significant advancement in clean energy. This 2025 milestone advances humanity’s efforts to use fusion, the process that powers the Sun, as a clean, carbon-free energy source. Fusion fuses hydrogen atoms at extremely high temperatures, releasing a significant amount of energy with little effect on the environment, in contrast to nuclear fission, which splits atoms and produces long-lived radioactive waste. One of the seven essential partners, India, has provided vital infrastructure, solidifying its standing as a pioneer in international scientific cooperation.

India’s Pivotal Contributions to ITER

Along with the US, China, Japan, South Korea, Russia, and the EU, India is a core member of the World’s largest nuclear fusion project, ITER, contributing around 9% of its expenses and supplying crucial components. The Tokamak is housed in the cryostat, a substantial stainless steel vacuum vessel 30 meters high and 30 meters wide. It was constructed by Larsen & Toubro to maintain extremely low temperatures. India also provided in-wall shielding and cooling systems for reactor stability and cryolines, which transport liquid helium to cool magnets to -269°C for superconductivity. Furthermore, the plasma can reach above 150 million°C—ten times hotter than the Sun’s core—thanks to India’s heating capabilities. The success of ITER is largely due to these efforts, which have their roots in India’s decades of fusion research.

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International Cooperation and Upcoming Opportunities

An engineering wonder, the Central Solenoid can raise an aircraft carrier when its sixth module is finished in 2025. It will power the ultra-hot plasma where fusion takes place. It was constructed in the United States and is being put together in southern France. ITER, a partnership between more than 30 nations, seeks to create a self-sustaining “burning plasma” by producing 500 MW of thermal power from 50 MW of input. ITER will supply vital information for upcoming commercial fusion reactors, even if they don’t produce electricity. All partners, including India, will share access to their research and patents. The project’s unusual worldwide collaboration was highlighted by ITER’s Director-General Pietro Barabaschi, who said, “This achievement proves humanity can overcome national differences to advance solutions for climate change and energy security.”

Despite previous delays and expense overruns, ITER achieved another milestone in 2025 when it installed the first vacuum vessel module three weeks ahead of schedule. The project’s unparalleled scope is demonstrated by its 10,000 tonnes of superconducting magnets, which are constructed from 100,000 kilometers of wire. Interest from the private sector is rising as ITER shares data to spur innovation. India and other partners pay 45% of the building costs, with Europe providing the remaining funding. ITER represents a promise for a sustainable energy future while assembled, and India’s contributions highlight its scientific prowess and dedication to global issues.

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