  We propose an experimental setup to search for Axion-like particles (ALPs)
using two superconducting radio-frequency cavities. In this
light-shining-through-wall setup the axion is sourced by two modes with large
fields and nonzero $\vec E\cdot \vec B$ in an emitter cavity. In a nearby
identical cavity only one of these modes, the spectator, is populated while the
other is a quiet signal mode. Axions can up-convert off the spectator mode into
signal photons. We discuss the physics reach of this setup finding potential to
explore new ALP parameter space. Enhanced sensitivity can be achieved if
high-level modes can be used, thanks to improved phase matching between the
excited modes and the generated axion field. We also discuss the potential
leakage noise effects and their mitigation, which is aided by O(GHz) separation
between the spectator and signal frequencies.
