Joint European Torus

For 40 years the world's largest tokamak — set fusion-energy records and validated ITER physics before shutdown in December 2023.

JET at Culham, UK was the world's most powerful fusion device for four decades and the only one capable of operating with deuterium-tritium fuel. Its final DTE3 campaign produced 69 MJ in a single 5-second pulse, validating ITER physics and tritium handling.

Key specifications

Major radius

2.96 m

Magnetic field

3.45 T

Plasma volume

100 m³

Milestones

1. 1983

   First plasma

2. 1997

   16 MW fusion power — record for 25 years

3. Feb 2022

   DTE2: 59 MJ in 5 s

4. 2023

   DTE3: 69 MJ in single pulse — final record

5. Dec 2023

   Operations concluded