SURFACE RESISTANCE OF HIGH TEMPERATURE SUPERCONDUCTOR BY THE RESONANT CAVITY METHOD
The cavities of high temperature superconductor were prepared and oxygenated Q measurements made.TM 010 modes were chosen for the measurements since they are independent of the cavity height. Resonant frequencies of the cavities were theoretically calculated and the corresponding S 11 parameters were measured by sweeping the Network Analyzer over the corresponding frequency range. Measurements were taken at a range of temperature from 10 K to 90 K in step of 10 K. Both unloaded Q-factor (Q 11 ) and loaded Q–factor (Q L ) were then calculated using the experimental data. A series of plots of Q vs. T are included in the thesis. Theoretical calculations were done to establish the relation between Q values and surface resistance of YBCO superconductor cavities based on the mode excitation. The surface resistances were then evaluated for the corresponding of YBCO cavities using the Q 0 values found from the measured data.
School:University of Cincinnati
School Location:USA - Ohio
Source Type:Master's Thesis
Keywords:superconductor high temperature surface resistance tm 010 modes
Date of Publication:01/01/2004