Searches for New Particles, Dark Matter, and Gravitational Waves with SRF Cavities

Understand

This is a Snowmass white paper on the utility of existing and future superconducting cavities to probe fundamental physics.

• Superconducting radio frequency (SRF) cavity technology has seen tremendous progress in the past decades, as a tool for accelerator science.
• With advances spear-headed by the SQMS center at Fermilab, they are now being brought to the quantum regime becoming a tool in quantum science thanks to the high degree of coherence.
• The same high quality factor can be leveraged in the search for new physics, including searches for new particles, dark matter, including the QCD axion, and gravitational waves.