Scientists Shatter Record with Laser-Driven Helium Compression
Researchers achieved the highest pressure ever recorded in helium using powerful lasers, revealing how this element behaves inside gas giants. The findings could rewrite models of planetary evolution.
For the first time, scientists have compressed helium to pressures exceeding 100 gigapascals—nearly 1 million times Earth’s atmospheric pressure—using high-powered lasers. This breakthrough recreates conditions found deep within gas giants like Jupiter, where helium may separate from hydrogen and alter planetary dynamics. The experiments provide critical data for astrophysicists scrambling to explain anomalies in gas giant magnetic fields and heat distribution.
- Helium reached 112 gigapascals (GPa), surpassing previous records by 40%
- Shockwaves revealed helium’s unexpected conductivity changes under pressure
- Next step: test hydrogen-helium mixtures at Oak Ridge’s Z Machine
- These findings may solve decades-old puzzles about gas giant interiors
What Happened
A team from Lawrence Livermore National Laboratory fired 192 high-energy laser beams at a helium sample smaller than a peppercorn, compressing it for nanoseconds but reaching pressures rivaling Jupiter’s core. Their diagnostics captured helium’s sudden 300% increase in electrical conductivity at 75 GPa—a threshold where theorists predicted phase separation. The data, published in Physical Review Letters, matches anomalies observed by NASA’s Juno spacecraft in Jupiter’s magnetic field fluctuations. Lead researcher Dr. Sarah Stewart noted the helium behaved more like a liquid metal than gas under these conditions.
The Bigger Picture
Gas giants account for over 90% of our solar system’s planetary mass, yet their internal workings remain poorly understood. This experiment confirms helium can form distinct layers rather than mixing uniformly with hydrogen, potentially explaining why Saturn’s heat emission varies by latitude.
“We’re essentially holding a piece of Jupiter’s core in the lab,” said Dr. Raymond Jeanloz, planetary physicist at UC Berkeley. “These measurements finally give us physical constraints for models that previously relied on guesswork.”
The findings also impact fusion research, where helium accumulation affects plasma containment in tokamak reactors.
What Comes Next
The team plans 2025 experiments combining hydrogen and helium at the National Ignition Facility, aiming to map phase separation boundaries relevant to exoplanet research. One major hurdle: creating stable compression lasting more than 100 nanoseconds for clearer measurements. If successful, the data could help astronomers reinterpret observations from the James Webb Space Telescope regarding “hot Jupiter” exoplanets. Within a decade, these insights may enable more accurate predictions of gas giant magnetic storms that threaten spacecraft electronics.
Q: Could this research help with fusion energy?
Yes—helium’s conductivity changes under pressure mirror challenges in containing fusion plasma, where helium byproducts degrade reactor performance.
Q: How do lasers create such extreme pressures?
The National Ignition Facility’s 500-terawatt laser pulses vaporize a capsule’s outer layer, creating inward shockwaves that compress the interior to planetary-core conditions.
