ADMX-Orpheus: A Dielectrically-Loaded Fabry-Perot Resonator to Search for Higher-Mass Axions
ORAL
Abstract
The ADMX experiment is currently searching for axions in the dark matter halo using a microwave cavity immersed in a strong magnetic field. The ADMX haloscope operates between 600 MHz and 1 GHz to search for axions with masses of a few micro-eV. However, this method is challenging to implement at higher masses because the cavity would need to have a smaller volume, reducing the signal strength. Thus, there is interest in developing more exotic resonators to address this issue. The ADMX-Orpheus haloscope is an open Fabry-Perot resonator with periodically placed dielectrics. This configuration allows for higher-order modes to couple with the axion while keeping the volume large. ADMX-Orpheus is designed to operate between 15 GHz and 18 GHz to search for axion-like particles around 70 micro-eV. I will discuss the development and characterization of the Orpheus resonator and the ongoing preparations to search for axion-like particles.
*This work was supported by the U.S. Department of Energy through Grants No DE-SC0009800, No. DE-SC0009723, No. DE-SC0010296, No. DE-SC0010280, No. DE-SC0011665, No. DEFG02-97ER41029, No. DE-FG02-96ER40956, No. DEAC52-07NA27344, No. DE-C03-76SF00098 and No. DE-SC0017987. Fermilab is a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359. Additional support was provided by the Heising-Simons Foundation and by the Lawrence Livermore National Laboratory and Pacific Northwest National Laboratory LDRD offices.
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