Design and performance of the ADMX SQUID-based microwave receiver

The Axion Dark Matter eXperiment (ADMX) was designed to detect ultra-weakly interacting relic axion particles by searching for their conversion to microwave photons in a resonant cavity positioned in a strong magnetic field. Given the extremely low expected axion–photon conversion power we have desi...

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Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2011-11, Vol.656 (1), p.39-44
Main Authors: Asztalos, S.J., Carosi, G., Hagmann, C., Kinion, D., van Bibber, K., Hotz, M., J Rosenberg, L., Rybka, G., Wagner, A., Hoskins, J., Martin, C., Sullivan, N.S., Tanner, D.B., Bradley, R., Clarke, John
Format: Article
Language:English
Subjects:
Axion
Conversion
Dark matter
Microwave cavity
Microwaves
Nuclear power generation
Receivers
Searching
SQUIDS
Superconducting quantum interference devices
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Summary:The Axion Dark Matter eXperiment (ADMX) was designed to detect ultra-weakly interacting relic axion particles by searching for their conversion to microwave photons in a resonant cavity positioned in a strong magnetic field. Given the extremely low expected axion–photon conversion power we have designed, built and operated a microwave receiver based on a Superconducting QUantum Interference Device (SQUID). We describe the ADMX receiver in detail as well as the analysis of narrow band microwave signals. We demonstrate the sustained use of a SQUID amplifier operating between 812 and 860MHz with a noise temperature of 1K. The receiver has a noise equivalent power of 1.1×10−24W/Hz in the band of operation for an integration time of 1.8×103s.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2011.07.019