SpaceX went public at $1.75 trillion in June. Yesterday it committed $16.8 billion to a chip fab in Grimes County, Texas. Follow the chain connecting those two numbers and you end at a light source that doesn't exist yet.
Start from the top. SpaceX has filed for up to 1 million data-center satellites, targeting hundreds of gigawatts of compute in orbit. Musk says current global chip output covers about 3% of what his companies will eventually need. So Terafab exists to print over 1 terawatt of compute per year across 100 million square feet, the largest chip site ever attempted.
Here's where the physics bites. Every advanced chip gets patterned with EUV light, and today that light comes from vaporizing 50,000 molten tin droplets per second with a laser inside each $200 million scanner. The tin splatters, the power caps out, and every scanner needs its own source.
A free-electron laser flips the architecture. Shoot electrons through undulator magnets and you get roughly 4x the EUV power with no tin debris. One accelerator can feed up to 20 scanners for 30 years, cutting per-wafer costs by about half.
That math is mediocre for TSMC, which spreads fabs across dozens of sites. A single 100 million square foot campus is the one place on Earth where a central light plant amortizes perfectly. Terafab's weird design choice and the FEL's weird economics fit each other like a key in a lock.
The pieces are already moving. Pat Gelsinger chairs xLight, which just took a $150 million CHIPS award to build the first FEL prototype in Albany by 2028. ASML's CEO confirmed Musk is in direct talks about Terafab.
Starlink pays the bills. Starship gets the applause. The number that decides whether SPCX holds $2 trillion is photons per second at 13.5 nanometers.
phil beisel (@pbeisel)
FEL = Free-Electron Laser
Is this even possible?
Next-gen EUV light source for chipmaking: a particle accelerator shoots high-speed electrons through magnets, generating ultra-bright, clean EUV light.
At Terafab scale it could sit as a central “light utility,” powering many scanners at once with way more photons and less mess than today’s tin-plasma sources.
Not day-one tech, more like the upgrade path once volume ramps hard.
— https://nitter.net/pbeisel/status/2085545377651212626#m