High-Q Superconducting Lumped-Element Resonators for Low-Mass Axion Searches
Abstract
Low-frequency superconducting lumped-element resonators have recently attracted significant attention in the context of axion dark matter searches. Here we present the design and implementation of a fixed-frequency superconducting resonator operating near 250~kHz, possessing an inductor volume of 1 liter and achieving an unloaded quality factor Q ≈ 2.1×106. This resonator represents a significant improvement over the state of the art and informs the design of searches for low-mass axions.
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