To be precise, nobody has done breakeven fusion with any fuel. Achieving sub-breakeven fusion is quite easy with small fusor devices, (http://en.wikipedia.org/w

To be precise, nobody has done breakeven fusion with any fuel. Achieving sub-breakeven fusion is quite easy with small fusor devices, (http://en.wikipedia.org/wiki/Fusor http://en.wikipedia.org/wiki/Fusor) though that won't tell you much that's useful for scaling larger reactors, besides maybe testing first-surface materials. (http://en.wikipedia.org/wiki/Plasma-facing_material http://en.wikipedia.org/wiki/Plasma-facing_material)