High-Speed Cameras Recorded ST40 Fusion Plasma
Researchers utilized 16,000 fps imaging to observe plasma behavior and lithium-based cooling techniques in the ST40 reactor.
Updated on Oct. 1, 2026 in Nuclear
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Physicists have captured high-resolution footage of plasma within the ST40 fusion reactor using a camera operating at 16,000 frames per second. This research aims to manage the intense thermal energy generated during fusion, which can reach heat fluxes of 150 megawatts per square meter.
Why it matters
Managing heat loads on divertor components—the parts of a reactor that extract heat and waste—is essential for the durability of future commercial fusion power plants. By tracking how injected lithium cools the plasma edge, researchers seek to prevent the physical disintegration of these critical reactor systems.
The imaging system achieved 16,000 frames per second, significantly exceeding the 10,000 fps baseline recommended for tracking lithium grain dynamics. This setup enabled observation of 150 megawatts per square meter heat fluxes at the divertor.
The players
Tokamak Energy
A private fusion energy developer focused on spherical tokamak designs and high-temperature superconducting magnets.
The details
Researchers inject lithium grains into the plasma maelstrom, where the material reacts to extreme temperatures to track cooling. Neutral lithium atoms emit crimson red light in cooler outer regions, while ionized lithium radiates a greenish-yellow glow. A magnetic field forms an X-shaped structure near the divertor, a component that extracts heat and waste particles, to facilitate energy dispersal. The high-speed camera helps physicists confirm if these lithium impurities effectively radiate energy away from the reactor walls.
Timeline
2014: Color camera deployed on Russia's T-11M tokamak.
2016: Paper published describing the 2014 T-11M experiment.
October 1, 2026: Article publication date.
The Tech Race
This imaging effort follows techniques pioneered at facilities like the T-11M tokamak. It marks a push to refine plasma diagnostics to meet the stringent material requirements of upcoming fusion power generation.
This research informs the design of future power plants rather than current consumer energy grids. Tokamak Energy plans to upgrade the ST40 with molybdenum armor and lithium coating to further test reactor durability against extreme heat.
The takeaway
Physicists are currently prioritizing thermal management techniques to ensure the survival of reactor materials. Future updates on the project will likely involve the transition to molybdenum armor and the long-term testing of lithium-based plasma shielding.
Further reading
For more on the development of fusion containment, visit /science/nuclear/.
Source note: This article includes information reported by ScienceAlert.
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