Journal
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Volume 28, Issue 6, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2018.2836946
Keywords
Niobium compounds; particle accelerators; superconducting microwave devices
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The Q-factor of superconducting accelerating cavities can be substantially improved by a special heat treatment under N-2 atmosphere (N-doping). Recent experiments at Fermi National Laboratory investigated the dependence of Q on the RF frequency and showed, unexpectedly, both an increase and a decrease with the RF field amplitude. This paper shall explain this finding by extending a previously proposed model founded on the two fluid model of RF losses, percolation, and the proximity effect in a disordered composite.
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