... deuterium. The DIII-D, at GeneralAtomics, and the Alcator C-Mod, at MIT, arecurrently the largest tokamaks operating in the U.S.TFTR and DIII-D are shown in Figure 44 .Fig. 41 .Fig. 42 .101Energy ... containing deute-rium and tritium, is irradiated by X-rays, or laserradiation, or particle beams. The rocket action of the material ablating from the capsule shell compresses and heats the fuel to ignition, ... earlier and summarizes the R&D activities and priorities, laying the foundationfor their program plans. The six most promisingconcepts were selected from over 100 submissions.They promise...