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Bright blue-white plasma glowing inside the MAST spherical tokamak vessel at Culham in the United Kingdom — CC BY 2.0: Eye Steel Film

World Explained · Energy and environment

A fusion reactor's magnetic bottle holds heat without touching it

Tokamak magnets bend charged particles into looping paths, shaping a hot plasma away from the wall. They confine rather than cool it, and imperfect edges remain difficult.

5 August 2026 · 4 min readRead story →

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