Abstract
This report presents the detection framework and a proposal for a pilot table-top experiment (supported by simulations and preliminary test results) for adoption into narrow mass range light Cold Dark Matter (CDM) searches, specifically for axions or Axion-Like Particles (ALPs) in a resonant cavity-based scheme. The novelty of this proposal lies in an attempt to concentrate searches corresponding to specific axion masses of interest (coinciding with recent proposals), using multiple cavities in a symmetric scheme, instead of using noisy and complicated tuning mechanisms, and in reduction of associated hardware by employing simpler underlying instrumentation instead of heterodyne mode of detection, by means of a low-noise ac amplification and dc phase-sensitive detection scheme, in order to make a viable and compact table-top experiment possible. These simplifications could possibly be valuable in substantially reducing detection hardware, experiment complexities (and associated noise) and long run-times, while maintaining low noise similar to conventional axion searches. The feasibility of proposed scheme and the experiment design are demonstrated with some calculations, simulations and preliminary tests with artificial axion signals injected into the cavities. The technique and ideas reported here have significant potential to be developed into a small-scale table-top, narrow-range, dark matter axion/ALP spectroscopy experiment, in addition to aiding in the on-going resonant cavity-based and broadband experiments.
Highlights
The current understanding of the beginnings and evolution of our universe is based on the ΛCDM model, based on strong theoretical motivations and compelling observations
Building upon similar lines and following similar motivations for axion searches in a resonant cavity scheme, we present here the proposal of a scheme with a few new ideas which might be valuable in creating a pilot table-top experiment for Cold dark matter (CDM) axion or Axion-Like Particles (ALPs) searches
The second stage consists of a traditional room-temperature high-electron mobility transistor (HEMT) low-noise amplifier (LNA) device connected to a commercial yttrium-iron-garnet (YIG) RF band-pass filter which provides a band-pass filtered output to an RF detector, which together endeavor to provide highest possible gain to considerably increase the signal power to be detected by the detection scheme
Summary
The current understanding of the beginnings and evolution of our universe is based on the ΛCDM model, based on strong theoretical motivations and compelling observations. In the presence of a high-intensity magnetic field, the aforementioned coupling is associated with a small momentum transfer (q) and the interaction remains coherent over a large distance [15], which enables the coupling to take the form of an axion-photon oscillation in analogy to the neutrino flavor mixing oscillations It becomes highly probable for such a process to be experimentally detected with sufficiently strong magnetic fields and sensitive measurement techniques. There have been a myriad number of axion searches from the sun and galactic sources going on in the past two decades, for example the ADMX experiment [19], whereby a resonant cavity housed in a strong magnetic field is tuned to a specific frequency (corresponding to the axion mass of interest) by a tuning mechanism and a heterodyne RF detection scheme is used to detect any possible resonant signals arising from the cavity beyond the noise floor of the detection system This is a low-temperature and extremely low-power quantum measurement, similar to cavity Quantum. These ideas (and the arguments presented in this report) could be valuable in on-going cQED axion searches as well
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