Helion clears key regulatory milestone on the path to building and operating the world's first fusion power plant

[OKIsItJustMe]

1. Fusion fuel: where does it go after fusion occurs?

https://www.helionenergy.com/blog/fusion-fuel-where-does-it-go-after-fusion-occurs

JUNE 18, 2026
BRYCE ALEXANDER
FUEL CYCLE MANAGER

A look into Helion’s closed-loop fuel system

The journey of fusion fuel in Helion’s system doesn’t end when fusion stops; it’s just getting started. In a closed-loop system, it follows a carefully managed path: fuel enters the machine, part of it fuses, the exhaust is captured, the valuable components are analyzed and separated, and the usable fuel is prepared to go back in again. For Helion’s approach, that path begins with a subset of three key fuels—deuterium, helium-3, and tritium—and each one takes a different path following a fusion pulse.

In this article, we explore the path of fuel particles through our pulsed power system and show how they’re recovered and recycled in the fuel cycle for the next round of fusion.

Fuel enters the machine

Helion’s machines operate with several fuel mixtures, including deuterium-deuterium (D-D), deuterium-tritium (D-T), and, deuterium-helium-3 (D-He-3). Gas is injected into the machine, where it is ionized into a plasma, and is accelerated, merged, and compressed to fusion conditions. At that point, one of two things happens: a particle either participates in fusion or it doesn’t.

If it fuses, it becomes a new particle: a helium isotope, proton, neutron, or tritium. If it doesn’t, it remains as unburned fuel.

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