I see. So if we're dealing with a 128-block-radius containment field, everything but the freeze gun could cover the entire volume if placed at the center. The arrow and air guns would need 2^59 ~= 10^18 Nm if my math is correct. I guess that's doable with a crapton of torque gears if they're OK running at speeds measured in nanoradians.
I sorta feel like the way to run this would be to use a fission reactor and use the waste products to make railgun rounds. Put that depleted uranium to good use.
Unless the power cost for the dimension itself is just too high for fission to keep up, in which case use fusion and something that doesn't require fuel. Laser gun sounds attractive, but since its range is double most everything else (and that of the field itself), you'd have four times as much area to cover if you want to collect any drops.
Getting that level of torque would likely be effectively impossible, even with multiple fusion reactors running in tandem, since the minimum amount of torque allowed is 1 Nm. A single, simple fission reactor could easily keep the dimension open, since it can fuel at least one high-pressure turbine which, itself, outputs the equivalent of around 16 million RF/t. The best bet would likely be the railgun, since I believe its damage can be scaled up with heavier rounds. However, the downside is that the railgun is incredibly destructive. In fact, most of the RoC turrets are. The laser is an 8 megawatt laser; for reference, a typical steel-cutting laser runs the order of 3 kilowatts at maximum output, meaning the RoC laser turret is over 1,000 times more powerful and, logically, 1,000 times more destructive. I've seen pictures Reika took of the devastation a railgun can cause, and it is immense. The containment field should prevent them from destroying the outlying terrain, but one should be careful to avoid the railgun accidentally destroying itself. In this case, the laser would probably be the best bet, assuming the dragon can't destroy it or its power source.
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To further impress upon you the destructive power of the laser: if it were to hit you full-on and envelop your body, you wouldn't just be atomized. That kind of energy would likely rip you apart at the subatomic level and even your constituent atoms would cease to exist. Eight megawatts don't mess around.
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