Author/Authors :
Asztalos، نويسنده , , S.J. and Carosi، نويسنده , , G. and Hagmann، نويسنده , , C. and Kinion، نويسنده , , D. and van Bibber، نويسنده , , K. and Hotz، نويسنده , , M. and J Rosenberg، نويسنده , , L. and Rybka، نويسنده , , G. and Wagner، نويسنده , , A. and Hoskins، نويسنده , , J. and Martin، نويسنده , , C. and Sullivan، نويسنده , , N.S. and Tanner، نويسنده , , D.B. and Bradley، نويسنده , , R. and Clarke، نويسنده , , John، نويسنده ,
Abstract :
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 860 MHz with a noise temperature of 1 K. The receiver has a noise equivalent power of 1.1 × 10 − 24 W / Hz in the band of operation for an integration time of 1.8 × 10 3 s .
Keywords :
Microwave cavity , axion , Dark matter , SQUIDs
