In an induction heater one of the main problems is that the coil carries a large current. This causes the coil to become hot. There is a limit to how large diameter the wire can be, because it needs to have multiple turns (I think). The standard solution to the problem is to use hollow tubing, then run water through the tubing, thereby cooling it.
Is there a better option for making the coil? The overall goal is to make a coil that can transmit large amounts of current without getting hot.
One obvious improvement I can think of is to make the coil out of silver. Silver is both more electrically conductive than copper and also more thermodynamically conductive, so it will be able to transmit electricity better and be less susceptible to heating up.
Is there an even better way, maybe superconductors?