http://www.economist.com/news/science-and-technology/21625861-lockheed-martin-thinks-it-can-make-fusion-power-reality-within-decade-big-bet-small http://www.eco

http://www.economist.com/news/science-and-technology/21625861-lockheed-martin-thinks-it-can-make-fusion-power-reality-within-decade-big-bet-small http://www.economist.com/news/science-and-technology/2162586... "As Tom McGuire, who is leading the Lockheed team, notes, however, the circular magnetic fields which coil around a tokamak’s doughnut become unstable if the plasma’s pressure is too high."