5 ms·
The article and paper lacks any indication of the amount of energy needed to run such a magnetic field. What amount would it take to run it, and what sources of
by rhave 10y ago
The article and paper lacks any indication of the amount of energy needed to run such a magnetic field. What amount would it take to run it, and what sources of energy would be viable for it?
- deleted 10y ago[deleted]
- ChuckMcM 10y agoPresumably PV panels. Although a really large RTG (nuclear thermal reactor) might work too. It really depends on the amount of power we're talking about.
- awful 10y agoResearch NMR magnets the size of several refrigerators already exceed 8-10T; they are superconducting and could after initial run up likely run for years with no power at all. They drift down over time but it likely not be a show stopper, and the cold of space would help them minimize cryogen maintenance times - it would be an activity on the way to or from the planet maybe? Edit: though the magnet itself wouldn't require continuous power, others added there would be pressure from the sun and say it could be counteracted by orbit geometry or active force being added.
- mighty_atomic_c 10y agoSo you thave ouched on an important limitation of electromagnets; they need to be cooled. In space, the vacuum surrounding this power hungry object would be inferior to air for heat transfer; heat merely seeps out slowly radiatively. So there would be a major improvement in keeping heat low/improving system efficiency or to transfer heat away without cooking the crew after the turn the thing on.
- deleted 10y ago[deleted]
- awful 10y agoIm not sure of your context; but yes an electromagnet is a non-starter here from the get go; dealing with all the mass and power issues, bad spacey thermodynamics.
- derekp7 10y agoWouldn't you be able to use somewhat normal refrigeration, then put a thermoelectric cooler on the heat exchanger side? If you could get the TEC's high temperature side hot enough, would it radiate heat more efficiently? (I'm assuming that hotter items radiate more joules of energy than cooler)
- gr2020 10y agoIs that true? A superconductor magnet needs to be cooled down to temperature (say 4K), but does it generate heat once operating? Seems like heat would come from resistance in the coil, but this resistance is zero when at operating temperature.
- ars 10y agoIt would consume power by fighting against incoming particles. This would end up as heat inside it.
- rlpb 10y agoA permanent magnet also fights against incoming particles, and doesn't seem to consume any energy. Why would an electromagnet be any different? Edit: the permanent magnet will feel a force applied against it in the opposite direction, of course. In space, that's have to be countered by rockets though, not electrically in the current running through the superconductor, right?
- ars 10y ago> Why would an electromagnet be any different? Because the incoming electrically charged particle induces current in the coils of the electromagnet. A permanent magnet does not have to deal with that - even if there is current it doesn't affect the magnetism in a permanent way. Think about an electric solenoid: A stationary electromagnet does not consume power, a moving one does as it acts on the external magnets.
- tbabb 10y agoSpace is not cold, at least in the inner solar system. To say nothing of internal resistance, however small, sunlight would fall on it and warm it up.
- deleted 10y ago[deleted]
- ohiovr 10y agoHow about using something like a Dyson-Harrop satellite https://en.wikipedia.org/wiki/Dyson–Harrop_satellite https://en.wikipedia.org/wiki/Dyson–Harrop_satellite as the power source