Marvel Fusion lands $70M for laser-powered fusion bet
Reading Time: 3 minutesWhen it comes to fusion power, there are two basic approaches: One, create a small star here on Earth that’s held in place by powerful magnetic fields. Two, use intense lasers to make a succession of even smaller stars, but repeat the process several times per second.
Moritz von der Linden likes his odds with the latter. In a world racing to wean itself off fossil fuels, fusion power promises to be an effectively limitless supply of energy, using widely available materials to recreate conditions that are hotter than the surface of the sun.
Marvel Fusion is one of several companies pursuing what’s known as inertial confinement fusion. It’s the same basic approach used at the National Ignition Facility, a Department of Energy lab which proved in 2022 that controlled fusion reactions could generate more power than it took to ignite them. That’s a helpful milestone for any startup chasing the thus-far elusive technology.
But where NIF’s lasers are based on decades-old designs, Marvel is using cutting-edge technology to improve its lasers’ power and efficiency. The startup will soon build a demonstration facility in collaboration with Colorado State University, where it hopes two 100-Joule lasers will prove its core technology. Shovels hit the dirt on October 16, and von der Linden expects it’ll be operational by early 2027.
Those lasers will fire faster than the blink of an eye — in the femtosecond range, or one billionth of second — bombarding a nanostructured target with photons that blast away its electrons and scatter the remaining positively charged ions. Those ions will then hit Marvel’s fuel, igniting a fusion reaction. Currently, the company is using a mix of mainly hydrogen and boron, though von der Linden says the company is taking a ‘mixed fuel’ approach to keep its options open should a more advantageous combination come along.
Compared with NIF’s fuel pellet, which is ensconced in a one-centimeter gold hohlraum that takes two weeks to manufacture and load, Marvel’s fuel and target were designed for mass manufacturing. The fuel itself is solid at room temperature, making it simpler to handle than NIF’s fel, which relies on either gaseous or cryogenically frozen hydrogen isotopes. Marvel’s target is simpler, too, made of silicon, not gold.
‘That was kind of an awakening,’ von der Linden said. ‘When the physics guys found out silicon works better, the target guys were like, ‘Hallelujah! We can use standard lithography from chip manufacturing.” At the dimensions Marvel intends to manufacture, about 50 to 80 nanometers per feature, the company can use semiconductor manufacturing equipment that’s up to a decade old. It can produce around 5,000 targets on a standard 300 millimeter wafer.
Marvel’s first commercial-scale prototype should be finalized around 2032 or 2033, von der Linden said, and it will contain between 10 and 20 two-kilojoule lasers. ‘With 20 lasers, we have the ability to really engineer the acceleration of the ions.’ Each will fire around ten times per second.
That’ll be the moment of truth. While the company’s Colorado facility will be a useful milestone, ‘it’s like driving a Ferrari with a two cylinder engine,’ von der Linden said. ‘It will move, but it won’t do what it’s supposed to do,’ which in Marvel’s case is generate useful amounts of power. If the full-scale prototype fires on all, er, lasers, then the startup has a chance of crossing the fusion finish line. The race is on.
Reference: https://techcrunch.com/2024/09/25/marvel-fusion-lands-70m-for-laser-powered-fusion-bet/
Ref: techcrunch
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