A new approach to cleaning the inner walls of a fusion system removes another obstacle to near-endle

[Marlin]

A new approach to cleaning the inner walls of a fusion system removes another obstacle to near-endless energy

https://www.pppl.gov/news/2026/new-approach-cleaning-inner-walls-fusion-system-removes-another-obstacle-near-endless

[Core Content]

An artist's interpretation of heat combined with particles

Researchers at the Princeton Plasma Physics Laboratory developed a method to clean porous tungsten tiles while sealed inside a fusion vacuum vessel. By applying heat and neon plasma, the team removed carbon and oxygen contaminants from the material. This process restored the metallic surface of the tiles without exposing them to air.

Maintaining clean plasma-facing components is a challenge for fusion reactors utilizing liquid lithium wall protection. This cleaning technique allows for in-situ maintenance of tungsten sponges, which are prone to contamination during manufacturing. The ability to purify these components after installation addresses a technical barrier for long-term reactor operation and material durability in high-heat fusion environments.

Researchers have found a clever way to clean the tiles inside a fusion system once they are sealed inside it and away from the potential contaminants that come from air. The advance, which uses heat combined with particles from a neon plasma to knock contaminants out of tiles, could help future fusion systems run better with liquid lithium.

The process removes contaminants from porous tungsten tiles after they have been sealed inside a vacuum vessel when further contamination isn't imminent.

Fusion systems need inner walls that are able to withstand extreme heat. One promising solution uses liquid lithium to protect the walls, held like water in a sponge made of the exceptionally strong metal tungsten. An advanced manufacturing process can be used to make tungsten into sponge-like wall tiles with lots of pores for flowing liquid lithium. But this process also leaves the tungsten contaminated with other materials, such as carbon, oxygen or nitrogen. When exposed to the liquid...

Read the full article at pppl.gov:
https://www.pppl.gov/news/2026/new-approach-cleaning-inner-walls-fusion-system-removes-another-obstacle-near-endless