ST40
The main purpose of ST-40 is to prove the feasibility of commercial fusion energy with compact spherical tokamaks.
- Operator
- Tokamak Energy
- Type
- Fusion device
- Approach
- Spherical tokamak
- Country
- GB
- Status
- Operating
- Ownership
- private
Progression
- 9.6 keV 2022
- 8.6 keV 2022
Results
6.3 × 10¹⁸ m⁻³·keV·s Fusion triple product (nTτE) claimed
measured 2022 · shot 10009 · high confidence
9.6 keV Ion temperature achieved
measured 2022 · shot 10009 · peak · high confidence
5.5 × 10¹⁹ m⁻³ Plasma density claimed
measured 2022 · shot 10009 · high confidence
0.012 s Energy confinement time (τE) claimed
measured 2022 · shot 10009 · high confidence
8.6 keV Ion temperature superseded
measured 2022 · shot 10009 · peak · high confidence
6 × 10¹⁸ m⁻³·keV·s Fusion triple product (nTτE) claimed
measured 2022 · peak · high confidence
8 × 10¹⁸ m⁻³·keV·s Fusion triple product (nTτE) claimed
measured 2025 · medium confidence
1 MA Plasma current claimed
measured 2025 · peak · medium confidence
Design values
What the machine was built to do, as published. Not results, and never ranked.
| Parameter | Value | Unit | Status | Source |
|---|---|---|---|---|
| Major radius medium confidence | 0.5 m | m | claimed | World Survey of Fusion Devices 2022 independent |
| Minor radius medium confidence | 0.3 m | m | claimed | World Survey of Fusion Devices 2022 independent |
| Plasma current medium confidence | 2 MA | MA | claimed | World Survey of Fusion Devices 2022 independent |
| On-axis magnetic field medium confidence | 3 T | T | claimed | World Survey of Fusion Devices 2022 independent |
| Plasma duration (nominal) medium confidence | 1 s | s | claimed | World Survey of Fusion Devices 2022 independent |