Abstract: A novel AC superconducting article comprising a composite structure having a superconducting surface along with a high thermally conductive material wherein the superconducting surface has the desired physical properties, geometrical shape and surface finish produced by the steps of depositing a superconducting layer upon a substrate having a predetermined surface finish and shape which conforms to that of the desired superconducting article, depositing a supporting layer of material on the superconducting layer and removing the substrate, the surface of the superconductor being a replica of the substrate surface.

Abstract: A superconducting microwave engine that achieves mechanical to microwave energy conversion or microwave to mechanical energy conversion. Such is accomplished by employing a superconducting resonator to increase the decay time of the microwaves inside the resonator and thereby provide the resonator with sufficient time to adiabatically deform and change its eigenfrequency so as to effect a change in the frequency and corresponding energy state of such microwaves in accordance with the Boltzmann-Ehrenfest Theorem. This invention may be in the form of a cylindrical cavity and piston combination, a cavity and vibrating diaphragm combination, or a cylindrical cavity and concentric rotor combination.

Abstract: A coupler capable of correctly coupling a microwave source into a resonant avity in a cryogenic environment. The coupler utilizes a rotary mechanical means to adjust the energy through the waveguide-beyond-cutoff into the cavity and control the reflections thereby.