The Department of Energy sponsors a laboratory that is currently working on magnetic fusion devices based on what principle?
National Spherical Torus Experiment The National Spherical Torus Experiment (NSTX) is an innovative magnetic fusion device based on the "spherical tokamak" concept. It was constructed by the Princeton Plasma Physics Laboratory (PPPL) in collaboration with the Oak Ridge National Laboratory, Columbia University, and the University of Washington at Seattle.
Superconducting steel Superconducting steel is a concept in materials science, referring to the idea of a steel alloy that would behave as a superconductor. The term has appeared primarily in discussions of designs of imagined devices involving nuclear fusion or processes with still higher densities of power.