# Axion production and detection with superconducting RF cavities

## TL;DR

This paper proposes a new laboratory method using superconducting RF cavities and a toroidal magnetic field to detect axions, potentially surpassing astrophysical limits and complementing optical experiments.

## Contribution

It introduces a novel experimental setup with high-Q superconducting cavities and a toroidal magnetic field for axion detection, enhancing sensitivity beyond current astrophysical bounds.

## Key findings

- Design achieves high quality factors ($Q \, \sim 10^{10} - 10^{12}$)
- Potential to probe axion-photon couplings beyond astrophysical limits
- Complementary to next-generation optical axion searches

## Abstract

We propose a novel design of a laboratory search for axions based on photon regeneration with superconducting RF cavities. Our particular setup uses a toroid as a region of confined static magnetic field, while production and detection cavities are positioned in regions of vanishing external field. This permits cavity operation at quality factors of $Q \sim 10^{10} - 10^{12}$. The limitations due to fundamental issues such as signal screening and back-reaction are discussed, and the optimal sensitivity is calculated. This experimental design can potentially probe axion-photon couplings beyond astrophysical limits, comparable and complementary to next generation optical experiments.