Yep. They were filming at the National Ignition Facility. That's basically a couple football fields worth of big banks of modular looking stuff used for generating 192 lasers that feed into a huge sphere jokingly called the Death Star (it's ten meters in diameter). They're trying to achieve fusion. Don't know what the script needs it for, but I can imagine a lot of things that would look cool when compressed or taken from the right angle. Lots of visual possibilities. Lots of activity when they were there, too, with obviously places screened and roped off.