Plate Nº 64 · recorded October 10, 2026
Space & AstronomyReported finding
X-ray scans and AI capture a heat shield mid-disintegration in real time
For the first time, researchers at Berkeley Lab used X-ray micro-CT and a generative AI network to capture 3D images of NASA heat-shield materials as they actively broke apart under 900°C heat.
By Priya Raman3 min read621 words
In brief
- Reentry pushes heat-shield surface temperatures past 1650°C (3002°F).
- The LBNL chamber heats samples up to 900°C (1652°F), the threshold at which ablators begin to break down.
- Two NASA materials were imaged: SLA-561V (cork filler) and SLA-220 (silicone-elastomer).
- A generative adversarial network upgraded rapid low-resolution scans into high-resolution 3D images.
- The Artemis I uncrewed test flight showed unexpected charring and uneven loss of ablative material not predicted by simulations.
Researchers at Lawrence Berkeley National Laboratory have, for the first time, recorded three-dimensional X-ray images of spacecraft heat shields actively breaking apart under reentry-like heat, capturing the destruction in real time rather than only before and after.
What does a heat shield actually do?
A heat shield's job during atmospheric reentry is to fall apart on purpose. As a spacecraft hits the upper atmosphere at hypersonic speed, friction and shock heating push surface temperatures past 1650°C (3002°F). A layer of ablative material absorbs that thermal energy, chars, vaporizes and drifts away, carrying the heat with it. The shield never recovers from the trip and must be replaced each time.
This trade-off has worked for everything from Mercury capsules to the Orion crew vehicle on Artemis. The recent Artemis I uncrewed test flight exposed the limits of prediction: mission engineers observed unexpected charring and uneven loss of ablative material that pre-flight simulations did not anticipate. The mission still ended in a safe Pacific splashdown.
How do you watch something burn at 900°C from the inside?
The Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory, working with NASA, built a specialized chamber that heats material samples to 900°C (1652°F)—the threshold at which most heat-shield materials begin to break down. Operators can vary chamber pressure and atmospheric gas composition to mimic some reentry features. Air velocity, though, is missing from the chamber's capabilities.
The chamber's main feature is its imaging window. While samples burn inside, the team bombards them with X-rays and assembles micro-computed tomography (micro-CT) scans—essentially three-dimensional cross-sections of the material's internal structure.
"Nearly every major NASA ablative heat shield material has been studied with this technique at the Advanced Light Source, including those relevant to the Artemis and Mars entry missions," said Vishnu Oruganti, one of the lead researchers, formerly a Ph.D. student at the University of Illinois at Urbana-Champaign and now at NASA's Johnson Space Center.
Why use AI on the images?
High-resolution micro-CT scans take a long time—too long to catch rapid structural change. Faster scans sacrifice resolution, blurring the very cracks and channels engineers need to see.
The team trained a generative adversarial network (GAN), a machine-learning algorithm in which two neural networks compete to sharpen output. The system fires off quick, medium-resolution scans, then upgrades them into high-resolution 3D records of the material warping, charring and hollowing out as it degrades.
What did the two test materials reveal?
The researchers examined two prominent NASA ablators that fail in very different ways:
- SLA-561V contains ground cork as a natural filler. When heated, the cork particles vaporize quickly, leaving hollow voids behind in the surrounding matrix.
- SLA-220, a silicone-elastomer matrix material, breaks down into a web of interconnected, branching microchannels that vent hot gas across the shield.
These differences matter for engineers designing shielding for specific entry profiles. A material that vents gas through branching channels behaves very differently from one that simply hollows out where cork burned away.
What hasn't been tested yet?
The team has not yet used the imaging pipeline to update the simulations engineers run before flights. They also did not analyze proprietary heat shields on commercial vehicles: SpaceX's Dragon uses phenolic-impregnated carbon ablator (PICA-X), and Starship relies on reusable ceramic tiles. Both are guarded company technology.
Those gaps leave open a practical question: whether real-time X-ray imaging will move from research labs into the day-to-day design loop for both government and private spacecraft, or remain a tool used only after missions end.
via Phys.org Space & Astronomy (Source)
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Senior reporter covering industry trends and analytics at SciBeat.
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