Speaker
Reyco Henning
(University of North Carolina at Chapel Hill)
Description
ABRACADABRA is an experiment that searches for axion dark matter (ADM) in the $10^{-14} - 10^{-6}\mathrm{eV}/c^2$ mass range. In ABRACADABRA, ADM couples to the static magnetic field of a toroidal magnet. This coupling induces a small, oscillating magnetic flux in the center of the torus that can be measured by a pickup loop connected to a SQUID current sensor. Both broadband and resonant readout modes are possible in the ABRACADABRA design. In this talk we review the ABRACADABRA motivation, concept, and plans. We also present the first results from a one month search for axions with a prototype, ABRACADABRA-10cm. We found no evidence for axion dark matter and set 95% C.L. upper limits on the axion-photon coupling between $g_{a\gamma\gamma}<1.4\times10^{-10}\,\mathrm{GeV}^{-1}$ and $g_{a\gamma\gamma}<3.3\times10^{-9}\,\mathrm{GeV}^{-1}$ over the mass range $3.1\times10^{-10}\,\mathrm{eV} - 8.3\times10^{-9}\,\mathrm{eV}$. These results are competitive with the most stringent astrophysical constraints in this mass range.
Primary author
Reyco Henning
(University of North Carolina at Chapel Hill)
