Optimizing Axion Dark Matter Multi-Cavity Designs*

The Axion Dark Matter eXperiment (ADMX) searches for the well motivated QCD Dark Matter axion via its conversion into a photon in the presence of a strong magnetic field. ADMX design 2A is a haloscope consisting of four identical copper plated cylindrical cavities, looking for signals with frequencies between 1.4 and 2.1 GHz. Across the available range of the tuning rod inside the cavity, the 2A design will extend the sensitivity in the search for axions in the 6-8 µeV mass range. The ADMX 2A cavities are simulated at Fermilab with COMSOL to predict and enhance various physical parameters of the system. Such parameters include the quality factor, form factor, and a mode map of the system. We present several techniques to improve losses due to leakage in order to achieve Q_Leakage > 10⁶ . This work gives insight to understanding how cavity designs affect the Q of a given system.