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Commonwealth Fusion Systems has begun installing the massive superconducting magnets that will confine plasma inside SPARC, the company's demonstration fusion reactor in Devens, Massachusetts. The first of 18 toroidal field magnets is now in place, marking a critical step toward the facility's planned first plasma later this year.The milestone puts CFS ahead of most private fusion competitors in the race to prove that a compact tokamak can produce more energy than it consumes. SPARC is designed to achieve a fusion gain of roughly Q=11, generating 50 to 100 megawatts of fusion power from just 25 megawatts of input heating.
CFS spun out of the Massachusetts Institute of Technology in 2018 with a core bet: high-temperature superconducting magnets could shrink a fusion reactor from the scale of a cathedral to something closer to a factory floor. In September 2021, the company validated that bet by producing a 20-Tesla magnetic field, a world record for a magnet of its type, using roughly 165 miles of HTS tape.
The approach stands in sharp contrast to ITER, the multinational government project in southern France that has consumed more than $20 billion and decades of construction time. SPARC measures 3.7 meters in diameter, about one-quarter of ITER's size, yet aims for comparable plasma performance.
CFS has raised nearly $3 billion in total capital, accounting for roughly one-third of all private fusion investment worldwide. Backers include Breakthrough Energy Ventures, Google, NVIDIA, and investors tied to Jeff Bezos. The U.S. Department of Energy has also selected the company for a $46 million milestone-based award under a $415 million federal fusion program.
The toroidal field magnets are the structural backbone of SPARC. Each one weighs several tons and must maintain its superconducting state at cryogenic temperatures while containing plasma heated to more than 100 million degrees Celsius. Workers had previously lowered a 48-ton vacuum vessel half into position before the magnet installation could proceed.
Bob Mumgaard, co-founder and CEO of CFS, has been explicit about commercial intent. "If you only build one fusion power plant, we have utterly failed," Mumgaard said in recent remarks. "You need thousands. Reaching this milestone shows you have got a useful product, not just a project."
The company's six-step milestone framework places the current work between Milestone 3 (machine assembly) and Milestone 4 (Q-Plasma greater than 1). Full deuterium-tritium operations are expected in 2027, when CFS aims to demonstrate net energy gain from the plasma itself.
U.S. Energy Secretary Chris Wright visited the Devens facility earlier this year, underscoring federal interest in private fusion as a potential source of carbon-free baseload power.
If SPARC performs as designed, it will be the first fusion device built by a private company to produce net energy from plasma. That distinction matters because it would validate the commercial viability of compact, high-field tokamaks as a category, not just a single machine.
For full coverage, visit https://www.linos.ai/science/commonwealth-fusion-sparc-magnet-installation/
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