PHASE METHOD OF MEASURING CAVITY QUALITY FACTOR

Novel method for measuring intrinsic quality factor of superconducting RF (SRF) cavities using both amplitude and phase information of forward, reflected, and transmit- ted cavity signal is discussed. Advantages of the method in comparison with traditional types of cavity quality fac- tor measurements are highlighted. Computer simulations and evaluation of uncertainties for the measurements are described. Analysis of data collected at vertical test facility for SRF cavities at Fermilab is presented.