单畴钇钡铜氧块材高Q值谐振腔研究

 在对高Q值的微波谐振腔的研究中, 尤其是对低温超导谐振腔（超导铌腔）的研究取得了很大的进展，生产加工技术也日趋成熟,而用高温超导材料来制备高Q值的谐振腔还不成熟。从高温超导体的表面电阻，生成方法，物质的微观结构等方面进行分析，实验中，通过一个端面用单畴YBCO块材代替无氧铜，在50K时谐振腔Q值就增加到原来的5倍，在20K时全部用单畴YBCO谐振腔，Q值有望达到铜腔的70倍，谐振腔的性能有明显的提高。

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 obviously.