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bbc_business apr 20, 2026

The 'dumb machine' promising a clean energy breakthrough

Stellarator, a complex device, may enable fusion energy breakthrough.

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a stellarator is a type of fusion reactor that's notoriously difficult to build. its complex, twisted magnetic coils are designed to contain superheated plasma more stably than other designs. if it works, it could provide a path to limitless, clean energy. the latest version, built by a team in germany, recently achieved a record plasma density.
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