in a series I am working on I will be using a D-He3 fusion drive system (similar to the one in the expanse according to Project RHO). I am under the assumption that the fuel will be stored in a pellet form that will then be "injected" into the engine where a powerful laser will compress it until fusion occurs. (If this is not the case then please clarify).
The question: what is the density of such a pellet? As a reference, how much of this could be stored within a cubic meter?