I saw a bbc documentary all about this earlier on this year. It took you to see how far the US had taken the experiments also to seet the South Korea K-Star, the world's first super-cooled, super-conducting fusion reactor.
If ever someone pulled this shit off (vertualy free energy) we would still be charged for it! that is the funny thing.
here you go found it:
http://www.youtube.com/watch?v=QXcyH7QE7rU
if you watch to the end you will see the predictions for the date the sientists think that they will succeed.