Searching for Higher Mass Dark Matter Axions

Axions are a promising dark matter candidate with masses constrained to be roughly between a $\mu$eV and a meV. Experiments searching for axions with masses of 1-10 $\mu$eV using microwave cavities are already in operation. However, some models favor masses 40 $\mu$eV and above, where microwave cavity experiments face significant challenges. This mass range may be accessible with a series of wire planes placed inside an open resonator or Fabry-Perot etalon. I will describe a prototype of this technique searching for axions of approximately 70 $\mu$eV corresponding to cavity and receiver operating in the 17GHz range.