Design and performance of the ADMX SQUID-based microwave receiver
نویسندگان
چکیده
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= ffiffiffiffiffiffi Hz p in the band of operation for an integration time of 1:8 10 s. Published by Elsevier B.V.
منابع مشابه
A Data Focusing method for Microwave Imaging of Extended Targets
This paper presents a data focusing method (DFM) to image extended targets using the multiple signal classification (MUSIC) algorithm. The restriction on the number of transmitter-receiver antennas in a microwave imaging system deteriorates profiling an extended target that comprises many point scatterers. Under such situation, the subspace-based linear inverse scattering methods, like the MUSI...
متن کاملOptimal SQUID based non-destructive test for detecting sub-surface defects with the help of advanced SQUID superconducting sensors and an experimental approach for optimal production method of these sensors from the YBCO superconductor materials
The conventional eddy current method for non-destructive inspection of welding joints has limitations that can examine defects to a certain depth below the surface of the sample and is not suitable for determining deep defects. This limitation can be overcome using the SQUID superconducting sensors. The nonstoichiometric composition of YBCO due to its superconducting temperature and desired cri...
متن کاملMulti-junction Effects in Dc Squid Phase Qubits
Title of dissertation: MULTI-JUNCTION EFFECTS IN DC SQUID PHASE QUBITS Benjamin K. Cooper, Doctor of Philosophy, 2013 Dissertation directed by: Professor Frederick C. Wellstood Department of Physics I discuss experimental and theoretical results on an LC filtered dc SQUID phase qubit. This qubit is an asymmetric aluminum dc SQUID, with junction critical currents 1.5 and 26.8 μA, on a sapphire s...
متن کاملPerformance of the Wavelet Transform-Neural Network Based Receiver for DPIM in Diffuse Indoor Optical Wireless Links in Presence of Artificial Light Interference
Artificial neural network (ANN) has application in communication engineering in diverse areas such as channel equalization, channel modeling, error control code because of its capability of nonlinear processing, adaptability, and parallel processing. On the other hand, wavelet transform (WT) with both the time and the frequency resolution provides the exact representation of signal in both doma...
متن کاملOptimal SQUID based non-destructive test for detecting sub-surface defects with the help of advanced SQUID superconducting sensors and an experimental approach for optimal production method of these sensors from the YBCO superconductor materials
The conventional eddy current method for non-destructive inspection of welding joints has limitations that can examine defects to a certain depth below the surface of the sample and is not suitable for determining deep defects. This limitation can be overcome using the SQUID superconducting sensors. The nonstoichiometric composition of YBCO due to its superconducting temperature and desired cri...
متن کامل