Axion-like particles (ALPs) are undiscovered pseudo-scalar particles that are candidates for ultralight dark matter. ALPs interact with photons slightly and cause the rotational oscillation of linearly polarized light. DANCE searches for ALP dark matter by amplifying the rotational oscillation with a bow-tie ring cavity.
The sensitivity of the current prototype experiment DANCE Act-1 is degraded by around 3 orders of magnitude due to the resonant frequency difference between s- and p- polarizations in the bow-tie ring cavity.The simultaneous resonance of linear polarizations is necessary to amplify both the carrier field and the ALP signal, and to achieve the design sensitivity.
In order to tune the resonant frequency difference, a method of introducing an auxiliary cavity was proposed. We are now introducing the idea of the auxiliary cavity to DANCE Act-1. In this conference, we will report on the design, the control scheme and the current status of the auxiliary cavity of DANCE Act-1.
|Reference to paper (DOI or arXiv)
|DOI: 10.1103/PhysRevLett.121.161301, arXiv:2105.06252