Effect of oxygen on RF properties in a single domain YBCO cavity resonatorfor microwave applications

The cylindrical single domain superconducting cavity resonator for microwav e applications has been made by a net-shape melt processing using YBCO. The quality factor (unloaded Q) has been measured on the cavity sample, below the transition temperature, T-c, in microwave frequencies. Experiments have been carried out to study the dependence of Q on the annealing temperature , as well as the influence of oxygen annealing history on Q value. Other fa ctors, which influence the Q value, will also be discussed.