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Lumped-Element Detectors
We use lumped-element detectors to search for sub-μeV mass axions. A strong magnetic field converts axions into electromagnetic waves with wavelengths much larger than the detector. At these wavelengths, the detector functions as an effecive LC circuit, which can be tuned to provide resonance pickup. This is analogous to a conventional radio reciever, except designed to be sensitive near the standard quantum limit!
We are involved in the DMRadio program, including DMRadio-50L (currently under construction), the proposed DMRadio-GUT experiment, and CAL-Pathfinder!
CAL-Pathfinder
DMRadio
DMRadio is a lumped-element search for low mass axions. Axions convert in a strong magnetic field into an effective current, which is detected by a tunable LC resonator coupled with a superconducting amplifier. We are currently building the DMRadio-50L experiment, located at Stanford, and preparing to build the DMRadio-m3 experiment, which will be located at SLAC. R&D is also ongoing in preparation for the large-scale DMRadio-GUT experiment, which will search for highly-motivated GUT-scale QCD axions.
Recent DMRadio publications:
CAD model of the DMRadio-50L magnet and inductor being built now
Model of the DMRadio-m^3 detector