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Aegis / MetroVolt burner · design render
Aegis / MetroVolt burner · design render · © 2026 KFE

Magnet Cold Mass

REBCO critical surface — the magnet operating envelope.
REBCO critical surface — the magnet operating envelope. canon 2026-08-27 · © 2026 KFE

The assembly of coils and structure held at cryogenic temperature.

Glossary of Fusion & Plasma TermsUpdated 2026-08-11

The cold mass is everything kept cold — the superconducting coils and their supporting structure — insulated by the cryostat and cooled by the cryoplant. Its thermal mass and heat leaks set the refrigeration load.

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