Fusion energy startup Inertia Enterprises has announced a significant breakthrough, successfully reducing the production time for its crucial fuel pellets from several days to mere minutes.
This drastic acceleration in fuel filling time marks a pivotal achievement for Inertia, addressing one of ten key barriers the company aims to overcome in the initial phase of its commercial power plant development. TechCrunch was granted an exclusive first look at this innovative process.
The success of this advancement was by no means guaranteed. Investors had committed $450 million to Inertia on the premise that the company could commercialize technology developed at the National Ignition Facility (NIF). The NIF is an elaborate scientific experiment, requiring painstaking care and feeding, where the production of fuel pellets can take a week or more and incur substantial costs—a model unsuitable for a profitable commercial operation.
"But when you really double-click on it, you’re like, wait a minute, they’re only making a handful of them a year," Jeff Lawson, co-founder and CEO of Inertia, told TechCrunch. "I put on my commercial hat and was like, wait a minute, I know the word for this: Prototypes."
At Inertia, the team's objective was to transform these prototypes into components suitable for mass manufacturing. "That’s why we’re hiring people from the likes of Apple," he said. "There’s a bunch of industrial engineers who are like, ‘Alright, I guess I have to go figure out how to make that a billion times over in a factory.’"
Despite the aspiration for mass production, NIF’s fuel pellet is far from a simple consumer device. It consists of an outer spherical diamond shell, encasing a thin layer of frozen deuterium and tritium—the hydrogen isotopes essential for a fusion reactor. Within this crystalline layer lies a mixture of gaseous deuterium and tritium. Crucially, each solid layer must be as close to perfectly spherical as possible.
These fuel pellets are subsequently wrapped in gold casings known as hohlraums, which convert laser energy into X-rays designed to compress the fuel pellet inside. If executed precisely, this compression induces atoms to fuse and release energy. However, even minor imperfections in the spherical shape can disrupt the ignition process, preventing the fusion reaction from reaching its full potential.
Inertia faced the challenge of condensing this complex process to achieve commercial viability without diverging from the fundamental physics principles established at NIF.
"What happens if you try to do it faster?" Lawson pondered. The team benefited from a significant head start: Annie Kritcher, co-founder and chief scientist at Inertia, was the designer of the first fusion experiment at NIF that successfully released more power than it consumed.
After multiple rounds of development, the startup achieved the ability to grow the crystals in approximately 30 minutes, a task that could previously take up to a week at NIF. In total, a single fuel pellet can now be manufactured in about two to three hours, with the process designed for scalability to an industrial level. Inertia developed this refined process with assistance from NIF at the Lawrence Livermore National Lab, with whom the startup has forged a public-private partnership.
Inertia also holds a distinct advantage that NIF does not. The startup plans to utilize a laser four times more powerful than NIF’s current system, which allows for greater tolerance of imperfections in the fuel pellet. This factor significantly contributed to accelerating the manufacturing process.
"We actually have a lot of margin," Lawson said. "That’s our strategy, to oversize our driver, our laser, to give us lots of margin to go play with in every other part of the system."
Reducing the fuel filling time has the critical secondary effect of minimizing the amount of tritium Inertia needs to store at any given moment. Tritium is radioactive and requires meticulous handling. Moreover, it is currently extremely expensive, costing approximately $30,000 per gram, with global stockpiles amounting to only about 25 kilograms, according to the journal Science.
Inertia, like many fusion startups, intends to generate its own tritium through the fusion reactions themselves, but an initial inventory is still necessary for startup. The expedited manufacturing time is instrumental in keeping this initial inventory small. Inertia anticipates that its full-scale commercial power plant will consume ten fuel pellets every second.
Lawson concluded, "By reducing the latency of this step, you’ve made your facility smaller; you’ve made the whole thing faster, the whole thing more efficient."
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