ermilab's Tevatron accelerator is a four-mile circle of 1,020 superconducting
magnets, 224 quadrupoles, like this one, and 796 dipoles. Building the Tevatron
took enough superconducting wire to circle the earth 2.3 times—and created a new
industry, ready to supply superconducting wire and cable for the emerging medical technology called magnetic resonance imaging.