Experiment demonstrates ultra-sensitivity for dark photon searches fermilabtoday physrevlett
Left: the experimental setup for the Dark SRF experiment consisting of two 1.3 GHz cavities. Right: a sketch of the Dark SRF electronic system.The Dark SRF emitter frequency collected over 6041 scans . The frequency variation in this test spans 5.7 Hz.
The emitter cavity was the less stable of the emitter-receiver pair.The measured power spectral density of the receiver cavity during the dark photon search run and thermal noise calibration run . For both runs, the peaks are caused by a leak of thermal photons from the receiver input line. The reference frequency is
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