From: Bob Higgins
Note that superconductors are only zero resistance for DC. As the frequency goes up, there is a finite resistance that increases with frequency. At 1 GHz RF, the superconductor still has some advantage over copper at the same frequency. As you start going beyond 10 GHz superconductors become less useful and at some frequency, there is a cross-over and copper is better. For the upper microwave bands, resonators with highest Q are pure dielectric devices with no conductor at all. This is insightful. The HTSC effect, even if temporary and local would not be particularly useful unless there was an additional diode effect resulting in DC . or else we are only looking for resonance, in which case we do not care about bulk resistance. Alternatively, perhaps a diode effect is not out of the question, especially in the geometry of the HotCat. There are two factors - electrical resistance and resonance that possibly are resolved when the particulate matches the wavelength in certain way. For instance - if the HotCat was operating at around 1050 C which corresponds to about 27 THz (wavelength 10.5 microns) then nickel particles which were about 13-14 microns in diameter would have a quarter wl circumference. Could they possibly rectify that wave, or if not, surely there would be extreme resonance? Since current is not passing through the device itself we do not care about bulk electrical resistance.
