Indeed, but my surprise is due to how far away Farnsworth fusors seemed to be from useful for anything besides being a switchable source of (ironically given this article is about aneutronic p-B11) neutron radiation.
The only thing I can figure is that this beam-target fusion except that the proton beam is their primary thruster so that any protons that don't fuse are not wasted. Still not sure how they get a 50% increase from fusion with boron but I assume that is merely optimistic.
