2018/11/08 by Gramolin, Alexander V., Aybas, Deniz, Johnson, Dorian +2
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Instrumentation and Detectors (physics.ins-det)
paper · doi:10.48550/arxiv.1811.03231
The sensitivity of experimental searches for axion dark matter coupled to photons is typically proportional to the strength of the applied static magnetic field. We demonstrate how a permeable material can be used to enhance the magnitude of this static magnetic field, and therefore improve the sensitivity of such searches in the low frequency lumped-circuit limit. Using gadolinium iron garnet toroids at temperature 4.2 K results in a factor of 4 enhancement compared to an air-core toroidal design. The enhancement is limited by magnetic saturation. Correlation of signals from three such toroids allows efficient rejection of systematics due to electromagnetic interference. The sensitivity of a centimeter-scale axion dark matter search based on this approach is on the order of gaγγ≈10-9 GeV-1 after 8 hours of data collection for axion masses near 10-10 eV. This approach may substantially extend the sensitivity reach of large-volume lumped element axion dark matter searches.