1,337 s plasma — longest ever (≈22 min)
2025-02WEST (CEA)
WEST (CEA, France) held a hydrogen plasma for 1,337 s — about 22 minutes — at 50M°C with a tungsten wall and 2 MW of heating, surpassing EAST's 1,066 s by ~25% for the longest sustained fusion plasma on record.
