I'm building a graviton-stabilised reactor, and I need a way to inject deuterium. For context, the stabilisation lasers are mounted on the top and bottom of the round reactor chamber, and I'm planning to place the injectors on the side. I haven't found a good way to make them inject yet, and I also haven't found a way to make the amount of deuterium injected controllable. I need assistance with designing the injection lasers.