AUTOTECHNO

One problem is that you need a device that, basically, will stand the pounding of a “miniature” thermonuclear machine cannon (you end up with a continuing series of contained miniature explosions). It will be practical only if the thermonuclear events can be made very, very, small and closely follow each other in very rapid succession

Yes, it should work; for a while.

I am confident that the energy industry will find a way to keep energy from becoming free or even low cost (no worries there).