CRITICAL POWER DISSIPATION IN A SUPERCONDUCTOR

The magnetic breakdown field $H_p\prime$ is calculated which, if applied at the surface of a super‐conductor, produces a critical power dissipation leading to a steep rise in the power loss. Generally $H_p{\mathrm{\prime \; <\; H}}_c$ , the critical field of the material. The functional dependence of the Q of a microwave cavity for values of H_p near $H_p\prime$ is also found.