Bill Gates-backed Commonwealth Fusion Systems hits key reactor construction milestone

Commonwealth Fusion Systems marked a major milestone Tuesday morning, announcing the installation of a key component of its Sparc demonstration reactor. The new part is a 24-foot wide, 75-ton stainless steel circle that forms the foundation of the tokamak, the doughnut-shaped heart of a fusion reactor that CFS hopes will be the first of its kind to generate more power than it consumes. Called the cryostat base, it was made in Italy and shipped halfway around the world to CFS’s site in Devens, Massachusetts. “It is the first piece of the actual fusion machine,” Alex Creely, director of tokamak operations at CFS, told TechCrunch. Work at the site has been underway now for more than three years as the company constructs the buildings and machinery that will support the reactor’s core. “It’s a big deal for us, because it means we’re transitioning into a new stage of the project where we’re not building an industrial facility — we’re still doing that a bit — but we’re also now building t ... Read full article.