You know, I don't think it is something they want in that type of machine.
Controlling the eddies and whirls of the writhing plasma so that it can burst into life as a miniature Sun has been a formidable, and so far only partially met, engineering challenge.
"If we follow the Mast idea and not the Jet one, we could imagine a string of medium-scale fusion reactors instead of a few very big ones," said Dr Sykes.
"There are still very many difficulties but perhaps in a few decades we could have commercial fusion reactors in cities providing cheap pollution-free power," he added.
Perhaps we will.