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World’s Largest Tokamak Fusion Reactor, JT-60SA, Commences Operations in Japan”

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EU and Japan celebrate start of operations of the JT-60SA fusion reactor
EU and Japan celebrate start of operations of the JT-60SA fusion reactor

The recent inauguration of the JT-60SA fusion reactor in Japan, a collaborative effort between the European Union and Japan, marks a pivotal moment in fusion energy development. This tokamak-type reactor, now the world’s most advanced and largest of its kind, is situated in Ibaraki Prefecture, Japan, and was officially started in December 2023.

The JT-60SA, an upgrade from its predecessor, the JT-60, incorporates state-of-the-art superconducting coils and other cutting-edge technology. This reactor’s journey to completion has been a challenging one. Initiated in 2013, its progress faced setbacks due to a 2011 earthquake and a short circuit in 2021, but it ultimately achieved its first plasma in October 2023. This milestone is not just a technical achievement but a testament to the resilience and commitment of the teams involved.

The operational commencement of JT-60SA was marked by a ceremony attended by key figures including the EU’s Energy Commissioner Kadri Simson and Japan’s MEXT Minister Masahito Moriyama. Both dignitaries reiterated the significance of this project in the broader scope of sustainable energy development and international cooperation in fusion research. This event underscored the importance of JT-60SA in contributing to ITER, the next big step in fusion research currently being constructed in France.


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Unlike typical fusion reactors that use a deuterium-tritium mix, JT-60SA initially uses hydrogen and later deuterium. This choice minimizes radioactivity and enhances flexibility for possible reconfigurations. While capable of reaching break-even conditions (where the energy output equals the input), JT-60SA’s primary aim is to gather critical data for ITER’s operation and aid in optimizing future fusion power plants, including the DEMO project.

JT-60SA’s operational status surpasses the Joint European Torus (JET) as the world’s largest functioning tokamak. JET, operational since 1983, is winding down its experiments in preparation for decommissioning in 2024. This transition highlights the evolving landscape of fusion research and the continuous quest for innovation and progress in this field.

The JT-60SA project is part of the broader Broader Approach agreement between the EU and Japan, which encompasses three fusion-related projects. This agreement, dating back to 2007 with a second phase launched in 2020, aims to complement and accelerate the development of fusion power and contribute to the ITER project.

Sunita Somvanshi

With over two decades of dedicated service in the state environmental ministry, this seasoned professional has cultivated a discerning perspective on the intricate interplay between environmental considerations and diverse industries. Sunita is armed with a keen eye for pivotal details, her extensive experience uniquely positions her to offer insightful commentary on topics ranging from business sustainability and global trade's environmental impact to fostering partnerships, optimizing freight and transport for ecological efficiency, and delving into the realms of thermal management, logistics, carbon credits, and energy transition. Through her writing, she not only imparts valuable knowledge but also provides a nuanced understanding of how businesses can harmonize with environmental imperatives, making her a crucial voice in the discourse on sustainable practices and the future of industry.

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