Study of high temperature YBCO bulk for high Q resonant cavity

On the way of pursuing the high Q value microwave resonant cavity, people are familiar with the property and producing technology of low temperature superconducting resonance cavity (Nb cavity), but aren't completed with producing high Q superconducting resonator with high temperature superconducting material. This paper analyzes the surface resistant of high temperature superconductor, the make technics and its microstructure, and studies the possibility and relative physical problem of making microwave resonance with YBCO high temperature superconductor. In the experiment, one plate by YBCO balk was replace, the Q of the resonator increases 4 times. It is expected to reach 70 times at 20K if the resonator is all made of YBCO material, and the performance of the resonator is improved obvi