A: I did not know that. though the reactor only has to be used one each trip to charge the capacitors for the sigma drive. Carbon can be loaded with the cargo to boost the reaction.
OOC: You also need
Nitrogen and Oxygen, in roughly equal ratio to the Hydrogen that is retrieved. You also don't get much hydrogen.
still, 650 seems a little extreme, I was thinking something more the size of the ship funneling what would normally hit it into a single collection facility.
Using these:
Mass Hydrogen Atom (1): 1.674×10^−27kg
Density of Cold Neutral Medium: 35 atom/cm³ = 35,000,000 atom/m³
Front Spacecraft Profile: 100m²
Volume Transited/Second: 299,792,458,000*100 = 29,979,245,800,000m³
You receive 1.04927x10^21 hydrogen atoms per second. Or, 0.0000017565kg/s. 0.15176kg/day. 55.3925kg/year. Not exactly substantial. I could work out how much power that'd produce you with the CNO Cycle, but I'd rather not and just say it'd be very little.
C: true, but it has not been disprove. however, in this universe, their is a lot of evidence pointing toward such a medium. also see point D.
The only places where hydrogen is much denser than in Cold Neutral Medium is in Molecular Clouds or H II regions--in other words, in nebulas, which do not comprise the majority of space. The majority of space is also not CNM. So the figure I just quoted you is probably optimistic.
D: It's very possible. ALL sigma craft do it, it's a built in part of their physics. read them, learn them. Sigma craft do not go out of phase, they are encompassed in a field. and lowish mass object that the ship collides with the field while the craft is in transit is also accelerated to FTL. this what lengthens the transit time of interstellar jaunts so much, and consumes much to the power used to make the jaunts. you really need to read up on your sigma physics.
Or I can use real physics to prove why they're bad. It's called inertia. The particles are effectively at rest relative to space. The kinetic energy of the particles along the way assumes they are moving at the velocity of the ship--if we use the ship as our frame of reference, then the particles are moving at that velocity relative to it (in the negative direction). If they enter some field of effect and are dragged along by it then their velocity vectors must be changed, and they must be accelerated in the positive direction such that their velocity relative to the ship becomes zero. Transiting from 1000c to zero velocity in any reasonable time for an uncontrolled object like a particle is impossible. They will enter such a field and tear a ship to pieces long before coming to rest relative to it.
Again you're dealing with more energy every 22 seconds than the human race produces annually. I don't care what magic voodoo Stigma physics relies upon--the initial energy allotment is achievable by humans, and therefore cannot conceivably stop something that is totally beyond their grasp. The dialogue basically goes:
Hydrogen: I'm the
Juggernaut, . .. .. .. .. .!
Humans: ... damn.
Stigma mechanics as described effectively don't make sense.
E: the scoop is more of a collector then a ram scoop, funneling the stuff collected for consumption after the ship gets to it's desalination.
And, as proven by simple algebra, you need vast areas to gain any appreciable quantity of hydrogen over time.
Supposing that intervening particles of matter must be shunted to the side, rather than absorbed into the field, would keep the basic gameplay mechanic, while also avoiding any need to use "phasing out" as an explanation.
Which is basically an Alcubierre warp bubble. Stuff doesn't get in or out of the bubble due to tidal stresses on the periphery. In such an instance, the Stigma particle is functioning as a source of negative energy density, and can just be said to be adversely affected by high gravitational fields.