PNNL

Abstract

We report the results from a haloscope search for axion dark matter in the 3.3–4.2 µeV mass range. This search excludes the axion-photon coupling predicted by one of the benchmark models of “invisible” axion dark matter, the KSVZ model. This sensitivity is achieved using a large-volume cavity, a superconducting magnet, ultra low noise quantum amplifiers, and sub-Kelvin temperatures. The validity of our detection procedure is ensured by injecting and detecting blind synthetic axion signals.