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When Mori Eisuke first visited ����ר�� in 2013 as a member of Japan’s House of Representatives and Chair of its Special Committee on Nuclear Power Issues, the tokamak site was a dusty stretch of land with some concrete slabs. Returning last week as Speaker of Japan’s House of Representatives, he encountered a dramatically different scene: standing in the tokamak pit, he could see the vacuum vessel chamber, now two-thirds complete.

“I have supported fusion for more than three decades and it is very meaningful and moving to see how far ����ר�� has progressed,” said Mori. “I have always believed in the project and to watch it become a reality is truly impressive.”

Mori’s connection to fusion predates his political career. While earning a doctorate in engineering from Nagoya University, he worked at Kawasaki Heavy Industries, where he conducted research on advanced hot isostatic pressing techniques. The technology, which uses high temperatures and uniform gas pressure to bond materials, remains relevant to the manufacture of demanding components for fusion systems today, including those used for the ����ר�� machine.

Since entering the House of Representatives in 1990, he has become one of Japan’s most consistent supporters of fusion research and international scientific cooperation. Over the years, he has helped sustain political backing for Japan’s participation in ����ר��, leading the Parliamentary Federation for the Promotion of Nuclear Fusion Energy and working with colleagues around the world to advance the long-term development of fusion energy. His visit to ����ר�� was an opportunity to witness how political support translates into tangible progress.

“The visit served as a reminder that major scientific endeavours are measured not only in technological milestones, but also in the sustained dedication of individuals like Dr. Mori who support them across generations,” said Taka Omae, Deputy Head of the ����ר�� Construction Project, who guided Mori during his visit to the site. “Few people can claim to have supported fusion from so many perspectives, first as an engineer, then as a parliamentarian, and now as Speaker of Japan’s House of Representatives. His long-standing commitment reflects the enduring support that Japan has provided to ����ר�� throughout its history.”

Mori toured the Tokamak Complex, the magnet cold test facility, the cryoplant, and the Assembly Hall. He also met with Director-General Pietro Barabaschi and spoke with the Japanese team at ����ר��. After visiting the project, he attended the  in Paris.