  In an effort to extend the usefulness of microwave cavity detectors to higher
axion masses, above ~8 $\mu$eV (~2 GHz), a numerical trade study of cavities
was conducted to investigate the merit of using variable periodic post arrays
and regulating vane designs for higher-frequency searches. The results show
that both designs could be used to develop resonant cavities for high-mass
axion searches. Multiple configurations of both methods obtained the scanning
sensitivity equivalent to approximately 4 coherently coupled cavities with a
single tuning rod.
