Matter converter reactors (MCRs) generate energy by completely breaking down non-metallic matter into particles that effectively have no mass. MCRs move material through a series sub-atomic catalytic fields. This stepwise process releases many times the energy than nuclear chain reactions from the same material. MCRs have to be precisely calibrated to a single fuel molecule to maintain a controlled reaction. Coarse MCRs are a less efficient design that filters out impurities and uses the most common molecule in heterogeneous mixtures. Even the most advanced Dynastic reactor cannot contain a reaction chain of metals or other such relatively unstable nuclei.
Matter Converter Reactors (MCRs): 100 word piece of Sci-Fi Minutia
When a future imagines something as fantastic as faster than light travel it has also to imagine a fantastic power source.