It’s time to start exercising some new muscles here at Commonwealth Fusion Systems: the business of providing our powerful magnet technology to other organizations.
Our first commercial deal in fusion magnets is with University of Wisconsin-Madison. We designed and built two high-temperature superconducting (HTS) magnets in a collaboration that began in 2019. Now we’ve taken the major step of delivering and installing them at the university’s Physical Sciences Lab. Experiments should begin soon at WHAM — short for Wisconsin HTS Axisymmetric Mirror. From our fusion lab to theirs!
If you want to see some real-world fusion energy hardware, check out our video here of the unboxing of the two magnets.
We nicknamed the magnets Thing 1 and Thing 2, inspired by the twins in Dr. Seuss’ The Cat in the Hat. They’re the high field “mirror” coils in WHAM, and hydrogen nuclei will bounce back and forth in a tube-shaped magnetic field between them. The magnetic mirror approach mostly fizzled decades ago, but our HTS superconducting electromagnets and some plasma physics breakthroughs mean they’re worthy of investigation again and ultimately could become a new path to fusion commercialization.
Which brings me to our magnet business. Our primary job is to build our own fusion machines, starting with the SPARC tokamak that’s under construction now at our headquarters in Devens, Massachusetts. But our expertise lets us help other parts of the fusion market, too, and better magnets make many approaches to confining a plasma and triggering fusion better. We are pro-fusion, and thus we are pro-fusion magnets.
We delivered the magnets as a full, integrated package with cooling, instrumentation, and software to control them. The WHAM magnets were possible because of our abilities not just in manufacturing but also modeling, design, and testing, integration — all things we do for SPARC.
It was a learning experience for us, too. Some of the technology we developed for WHAM helped us with SPARC and other possible projects with other customers inside and outside fusion.
Speaking as a plasma physicist, it’s fantastic to see this kind of progress in fusion energy again, enabled by new technology, better physics, and great partnerships. I have fond memories of working in the long-thin West Cell at MIT that was built to hold a long-thin mirror decades ago. Turns out, it was just ahead of its time and a bit short of HTS.
Congratulations to the CFS team and our Wisconsin colleagues for building WHAM. We’re eager to see it up and running, and for the team to take it to the next phase!
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