CFS says more than half of the HTS 'pancake' coils for SPARC's magnets are built

Commonwealth Fusion Systems/SPARC

Commonwealth Fusion Systems said it has built more than half of the high-temperature superconducting (HTS) pancake coils that stack to form SPARC's D-shaped toroidal field magnets and circular poloidal field magnets. Completed pancake stacks are inserted into split steel cases and welded shut by robots; magnet production has been the main pacing item for tokamak assembly.

• Over 50% of HTS pancake coils built; coils wound from high-temperature superconducting tape.
• Toroidal field magnets are D-shaped with steady current; poloidal field use pulsed current.
• Completed pancake stacks placed in split steel cases and robotic-welded shut.
• Magnet production has been the critical path item for SPARC assembly.