High-Q Superconducting Lumped-Element Resonators for Low-Mass Axion Searches

TL;DR

This paper reports the design and implementation of a high-Q superconducting lumped-element resonator at 250 kHz, significantly improving the quality factor for low-mass axion dark matter searches.

Contribution

The paper introduces a novel fixed-frequency superconducting resonator with a high quality factor and large inductive volume for enhanced axion detection sensitivity.

Findings

Achieved an unloaded quality factor of approximately 2.1 million.

Designed a resonator operating near 250 kHz with a 1-liter inductor volume.

Significantly improved the state-of-the-art in low-frequency superconducting resonators.

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 $250~\mathrm{kHz}$, possessing an inductor volume of $\sim 1$ liter and achieving an unloaded quality factor $Q \approx 2.1\times10^{6}$. This resonator represents a significant improvement over the state of the art and informs the design of searches for low-mass axions.