Future Plans for the Axion Dark Matter Experiment (ADMX)

Dark matter is likely to be made of new, as yet undiscovered particles and a very well motivated candidate is the axion, a light ($\mu$eV-meV) mass pseudoscalar neutral boson. It’s possible detection can be made using a large scale cryogenic microwave cavity placed in a high magnetic field. The Axion Dark Matter eXperiment (ADMX), a DOE Generation 2 dark matter project, is currently the only operating experiment sensitive to primordial axions with DFSZ scale couplings. ADMX is currently operating in the 0.6-2 GHz range as part of the G2 program but has begun to lay the groundwork to extend the range to higher frequencies. Here I will give an overview of the ADMX 2-4+ GHz system which aims to use multiple co-added microwave cavities to increase the scan rate for higher mass axions. This system will likely use a new, higher field magnet system than the current ADMX system and represents a large increase in complexity with 10s of cavities being coherently combined digitally. We will go through the current plans and anticipated reach of the next generation system.