Assembly has begun on ITER, the world's largest nuclear fusion reactor
DOUGHNUT DEVICE: Engineers work on the first section of the vacu- um vessel—the torus- shaped container that will house the plasma where, ideally, fusion will ignite. Inside ITER, two isotopes of hydrogen— deuterium and tritium— will collide at high speed, offering a chance for two atoms to stick and form helium. The small bit of mass lost in the reaction converts into energy in a deal brokered by Albert Einstein’s famous equa- tion, E = mc2. /Photographs by Manuela Schirra and Fabrizio Giraldi
