"Shot with a high speed color camera, the video shows a donut-shaped chamber called a tokamak - the company's namesake - swirling with a pink cloud of glowing hydrogen plasma as it reaches temperatures hotter than the core of the Sun, all imprisoned in an unbelievably powerful magnetic field. What we're seeing is only the visiblelight from the plasma's edge, because the core of the plasma is so hot that it doesn't emit visible light at all."
"Plasma is better in colour! Watch one of our latest #plasma pulses in our ST40 tokamak, filmed using our new high-speed colour camera at an incredible 16,000 frames per second.Each pulse lasts around a fifth of a second. What you're seeing is mostly visible light from the... pic.twitter.com/jWKmcl0tEx- Tokamak Energy (@TokamakEnergy) October 15, 2025"
"In the top right corner, you can also witness a dazzling spectacle of lithium grains being injected into the chamber. At first a brilliant red, the lithium grains fall deeper into the plasma, while ionization turns it into a blurred halo of bright green."
High-speed footage captures an ST40 tokamak confining hydrogen plasma at temperatures exceeding the Sun's core using extremely strong magnetic fields. Visible light originates primarily from the plasma edge because the plasma core is too hot to emit visible wavelengths. Camera footage at 16,000 frames per second records pulses lasting about one-fifth of a second. Injected lithium grains appear red as they enter and then ionize into a green halo deeper in the plasma. Superconductor magnets generate the magnetic trap because no solid material can contain the superheated plasma. Achieving sustained fusion on Earth remains difficult without stellar gravity.
Read at Futurism
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