See More →One of the world’s most powerful magnets is the Central Solenoid of the megaproject ITER. Once there, they will be carefully stacked at the center of the fusion experiment’s torus design, which is known as a tokamak. “In a fusion device, the plasma is what the fusion reaction occurs in,” Smith explained. However, no project has ever been able to reach a “plasma energy break-even point” at which the energy output exceeds the input. Part of it is clearly due to engineering challenges and physics challenges that are real, no question,” Coblentz said.