OK, so then what you're proposing isn't a pure fusion reactor but a hybrid fusion-fission reactor. That's probably going to combine many of the disadvantages o

OK, so then what you're proposing isn't a pure fusion reactor but a hybrid fusion-fission reactor. That's probably going to combine many of the disadvantages of fusion and fission. You get both the highly radioactive and long-life decay products of fission, still need relatively rare fissile fuel and you get the containment problems of fusion. Moreover if you need a fission explosion trigger you need a critical mass of fissile material for each detonation so there's a limit to how far you can scale down the process. I think it's highly unlikely this could be practical.