Kavli Affiliate: Peter Graham
| First 5 Authors: Benjamin Godfrey, J. Anthony Tyson, Seth Hillbrand, Jon Balajthy, Daniel Polin
| Summary:
We are building an experiment to search for dark matter in the form of dark
photons in the nano- to milli-eV mass range. This experiment is the
electromagnetic dual of magnetic detector dark radio experiments. It is also a
frequency-time dual experiment in two ways: We search for a high-Q signal in
wide-band data rather than tuning a high-$Q$ resonator, and we measure electric
rather than magnetic fields. In this paper we describe a pilot experiment using
room temperature electronics which demonstrates feasibility and sets useful
limits to the kinetic coupling $epsilon sim 10^{-12}$ over 50–300 MHz. With
a factor of 2000 increase in real-time spectral coverage, and lower system
noise temperature, it will soon be possible to search a wide range of masses at
100 times this sensitivity. We describe the planned experiment in two phases:
Phase-I will implement a wide band, 5-million channel, real-time FFT processor
over the 30–300 MHz range with a back-end time-domain optimal filter to search
for the predicted $Qsim 10^6$ line using low-noise amplifiers. We have
completed spot frequency calibrations using a biconical dipole antenna in a
shielded room that extrapolate to a $5 sigma$ limit of $epsilonsim 10^{-13}$
for the coupling from the dark field, per month of integration. Phase-II will
extend the search to 20 GHz using cryogenic preamplifiers and new antennas.
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