[freefdny]

https://www.famousscientists.org/michio-kaku/
He did build a particle accelerator in his garage when he was a kid. So he’s got that going for him.

[Steely Tom]

Scientific American's Amateur Scientist column described in detail exactly how to build a particle accelerator back in the 1960s; I would imagine his particle accelerator was strongly influenced by that column. It was based on a Vandergraff generator, and isn't nearly powerful enough to produce antimatter.