  We describe a dark matter axion detector designed, constructed, and operated
both as an innovation platform for new cavity and amplifier technologies and as
a data pathfinder in the $5 - 25$ GHz range ($\sim20-100\: \mu$eV). The
platform is small but flexible to facilitate the development of new microwave
cavity and amplifier concepts in an operational environment. The experiment has
recently completed its first data production; it is the first microwave cavity
axion search to deploy a Josephson parametric amplifier and a dilution
refrigerator to achieve near-quantum limited performance.
