Alright, to everyone who knows their shit about fusion research:

How come we aren't using fission reactions to boost our fusion plasmas? We can surely maintain a small fission reaction in the center of a fusion reactor if we designed them that way, right? Like have some Americium pressed into a subcritical mass, wrap it in graphite, then let the now-critical reaction contribute particles to our fusion plasma? In this case I don't know if we would even want any kind of inertial dampening for the particles from the fission (e. G. Graphite/cobalt), as I imagine the fusion plasmas (deuterium I think) as very well compressed and the fast particles have more chance to impact the fusion fuel, releasing more energy.

Would this work for boosting the ease of achieving fusion, making it easier to collect power from? Besides the heat from the particle generating fission reaction can be harvested the way a normal fission reactor's heat is harvested. Is this something that's ever been tried or discussed?