Evergreen explainer · neutral data, no opinion

Longest sustained plasma

Current verified value

1,337s

WEST (CEA) · 1,337 s, tungsten wall (2025)

What it measures

How long a high-performance plasma is held. Steady-state operation is the bridge from physics demos to a real power plant.

WEST (CEA)1,337 s, 50M°C (2025)1.3ks

EAST (ASIPP)1,066 s high-confinement (2025)1.1ks

KSTAR102 s, H-mode (2024)102s

now1,337s

trend toward steady-state operation