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A resonance detection scheme and some useful ideas for cavity-based searchesof light cold dark matter particles (such as axions) are presented, as aneffort to aid in the on-going endeavors in this direction as well as for futureexperiments, especially in possibly developing a table-top experiment. Thescheme is based on our idea of a resonant detector, incorporating an integratedTunnel Diode (TD) and a GaAs HEMT/HFET (High Electron MobilityTransistor/Heterogenous FET) transistor amplifier, weakly coupled to a cavityin a strong transverse magnetic field. The TD-amplifier combination issuggested as a sensitive and simple technique to facilitate resonance detectionwithin the cavity while maintaining excellent noise performance, whereas ourproposed Halbach magnet array could serve as a low-noise and permanent solutionreplacing the conventional electromagnets scheme. We present some preliminarytest results which demonstrate resonance detection from simulated test signalsin a small optimal axion mass range with superior Signal-to-Noise Ratios (SNR).Our suggested design also contains an overview of a simpler on-resonance dcsignal read-out scheme replacing the complicated heterodyne readout. We believethat all these factors and our propositions could possibly improve or at leastsimplify the resonance detection and read-out in cavity-based DM particledetection searches (and other spectroscopy applications) and reduce thecomplications (and associated costs), in addition to reducing theelectromagnetic interference and background.

An Experiment and Detection Scheme for Cavity-based Cold Dark Matter Searches