ADMX Run 2A: A Multi-Cavity QCD Axion Search
ORAL
Abstract
The QCD axion is among the best motivated particle dark matter (DM) candidates. Cavity haloscopes like ADMX (Axion Dark Matter eXperiment) resonantly detect conversion of DM axions to photons under a strong magnetic field in a high-Q resonant cavity. Recent ADMX runs with a single cavity excluded most of the QCD axion parameter range between 2.7μeV and 4.2μeV and are set to cover the range until about 5.4μeV. However, at higher masses the wavelength of the generated photons shrinks, generally leading to a smaller cavity volume and reduced sensitivity. In this talk we present an array of four cavities, tuning in sync to scan a broad mass range from 5.4μeV to 7.6μeV with QCD axion sensitivity. We discuss experimental measurements of the quality factor and other important electromagnetic characteristics at room temperature and 4K. We show recent R&D and experimental improvements, and outline the path towards commissioning and run of the full axion search experiment.
*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 office.
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Presenters
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Stefan P Knirck
- Fermilab