He was quite a genius, and the real inventor of television, not RCA. I can't understand why his experiments have never been tried to be duplicated. It makes no sense at all for them to have been ignored due to current NIH.
Please see: http://www.farnovision.com/chronicles/fusion/vassilatos.html
There is an active community of amateur open source hobbyists researchers, several of whom have gotten fusors up & running & pumping out neutrons. I don't know how big or powerful the largest ones are, but I don't think anyone's found any hard theoretical limits so far.
The Boy Who Invented Television:
A Story of Inspiration,
Persistence and Quiet Passion
by Paul Schatzkin