SPARC

SPARC is designed to operate on deuterium-tritium fuel with the aim of becoming the first magnetic-confinement fusion device to produce more fusion power than the heating power put into the plasma (Q > 1).

Operator: Commonwealth Fusion Systems
Type: Fusion device
Approach: Tokamak
Fuel: D-T
Country: US
Status: Under construction
Ownership: private

Results

6.2 × 10²¹ m⁻³·keV·s Fusion triple product (nTτ_E) planned

high confidence

Continuing progress toward fusion energy breakeven and gain as measured against the Lawson criteria independent

20 keV Ion temperature planned

peak · high confidence

Continuing progress toward fusion energy breakeven and gain as measured against the Lawson criteria independent

4 × 10²⁰ m⁻³ Plasma density planned

high confidence

Continuing progress toward fusion energy breakeven and gain as measured against the Lawson criteria independent

0.77 s Energy confinement time (τ_E) planned

high confidence

Continuing progress toward fusion energy breakeven and gain as measured against the Lawson criteria independent

2 Plasma gain (Q_plasma) planned

Fusion power produced ÷ External heating power coupled into the plasma · low confidence

SPARC: Proving commercial fusion energy is possible | Commonwealth Fusion Systems operator
Journal of Plasma Physics independent

Design values

What the machine was built to do, as published. Not results, and never ranked.

Design values for SPARC
Parameter	Value	Unit	Status	Source
Major radius medium confidence	1.85 m	m	planned	World Survey of Fusion Devices 2022 independent
Minor radius medium confidence	0.57 m	m	planned	World Survey of Fusion Devices 2022 independent
Plasma current medium confidence	8.7 MA	MA	planned	World Survey of Fusion Devices 2022 independent
On-axis magnetic field medium confidence	12.2 T	T	planned	World Survey of Fusion Devices 2022 independent