Scientists at the LLNL’s National Ignition Facility (NIF) are using a powerful laser to heat and compress hydrogen fuel, with the goal of initiating fusion. In order to reach the milestone of “ignition,” they must show that the energy released by fusion exceeds the energy delivered by the laser. A recent experiment, conducted on August 8, shows that, for a brief moment, they were able to produce 1.3 megajoules of energy, which is roughly 70 percent of the laser energy. In order to achieve ignition, they must produce more than the 1.9 MJ emitted by the laser. Though the achievement does not constitute ignition, it is a significant step towards reaching that milestone.
“This advancement puts researchers at the threshold of fusion ignition, an important goal of the NIF, and opens access to a new experimental regime,” a press statement from the researchers reads.
The long road to nuclear fusion
Though the results of the LLNL’s August 8 experiment are yet to be peer-reviewed, the researchers state that the initial analysis shows an 8x improvement over the last ignition experiments conducted in spring 2021, and a 25x increase in energy yield over experiments in 2018.
Goals on the road to nuclear fusion are often given the hype treatment, meaning it can be difficult to distinguish whether they really merit the grand statement. Earlier this year, scientists from TAE Technologies developed a method for producing stable plasma at temperatures topping 50 million degrees Celsius — which is more than double the temperature of the core of the Sun.
They referred to the achievement as an “incredibly rewarding milestone.” The UK’s planned nuclear fusion reactor, the Spherical Tokamak for Energy Production (STEP), is expected to be operational no earlier than 2040, so we likely have some time to wait still before we see nuclear fusion truly take flight, and there will be plenty of merits and grand statements to go around.
0