The more you cool it, the less resistance it has, and the less heat generated. The critical temperature should be -150degC in this element. Resistance is a property which has not been properly simulated yet, but it will need to be simulated specifically in the SUCO element, in order for it to exhibit realistic behavior. Resistance will be calculated from its temperature. At -150degC or below it will have a resistance of 0. Above -150degC, it will have a resistance equal to 150 + Temp. Therefore at 0degC, the resistance will be 150, and at room temperature (22degC) it will have a resistance of 172. The resistance affects 2 factors, the probability of a particle of SPRK being neutralized in any given tick, and the amount of temperature increase in a given particle of SUCO for each particle of SPRK that passes through it. In a given particle of SUCO, for each unit of resistance that it has, the there will be a 0.125degC increase in temperature for each particle of SPRK that passes through it. As for probability of SPRK randomly disappearing in any given tick, here's how that probability is to be calculated. Prob = Resistance/5000. These calculations will produce the desired behavior of the superconductor.

As for physical constants, both melting point, and thermal conductivity will be the same as METL.

If a large loop of SUCO is conducting current in a continuous loop (with no external supply connected), and is cooled by LN2 or LOXY, and an external temperature source forces the temperature of a few particles of SUCO to be above -150degC for a long enough period of time, an interesting chain reaction will happen. Though there will be only a small probability at these almost-critical temperatures of SPRK disappearing in any tick of the program, a significant amount of heat will be generated. A single pulse of electricity in TPT is 8 particles of SPRK long. If 8 particles of SPRK pass through a given particle of SUCO that is at -149degC, then each one of these 8 particles of SPRK will increase the temperature of that particle of SUCO by 0.125degC, for a total of 1degC. This may not sound like much (particularly if the SUCO is surrounded by LN2 or LOXY, which can quickly re-cool the SUCO) but if a long train of pulses (the SUCO loop is full of SPRK), then each of these 8-particle pulses of SPRK will increase the tempearature, at first slowly, but then quite quickly, in an exponential curve. This heat will be thermally conducted into adjacent particles of SUCO, raising their temperature above the critical-tempearature as well, and this chain reaction will also boil off the LN2 or LOXY, until there is no cryogenic coolant left to bring down the temperature of the SUCO, and as the temperature increases, the resistance increases. And as the resistance increases the temperature increases. At a certain point the probability of the SPRK being removed will be large enough to decrease the amount of current to stop the chain reaction, but it also may not (depending on chance, as probability of SPRK being removed is not a guaranty of it being removed, and also based on the thickness of the wire, and a number of other factors such as emergency cooling systems using GOL particles, etc), and if the chain reaction is not stopped quickly enough, the temperature may exceed the melting point of the material (which will be 1000degC, the same as METL). So the chain reaction failure of the coolant, could cause the wires to get red-hot, or even melt, depending on whether or not all of the SPRK was completely removed before the melting point was reached. By the way, this cascading failure of a superconductor is actually a possibility in real life. It's called "quenching".

@Sandwichlizard (View Post)
Indeed, the macro-behavior is consistent, but the micro-behavior of a resistor is anything BUT consistent. A higher resistance means that electrons flowing through the material have a higher probability of colliding with an atom at any given moment. And yes, these collisions ARE random events. Now since there's no way to simulate an SPRK colliding with an atom in TPT (which doesn't even have simulation of charge or electric fields, or the concept of current into a device must equal current out of it) I'm having to work around TPT's lack of realistic physics, in order to come up with a reasonable suggestion on how to make a realistic superconductor. The suggestion I gave in my intro post to this thread, would cause the overall behavior of the SUCO element to closely mimic the overall behavior real life super conductors. This would enable me to actually use TPT as a way to demonstrate to others the concept of how super conductors work, and thus use it as an actual educational tool.

It needs to be super specific if it is to be implemented. Notice that with METL, it doesn't just "melt when it gets too hot", instead it "melts when it reaches 1000degC". In order for TPT developers to be able to implement an element, the element's suggester must make certain that they provide very specific values, so that the developers will be able to take what the suggesters give and actually implement it. Otherwise the developers won't be certain exactly what values to use, and they may end up producing an element that does NOT behave the way that the suggester wanted.