A dc SQUID for use below 1 K

For detection of weak signals, and for use on ultralow temperature experiments, it would be useful to have a robust superconducting quantum interference device (SQUID) amplifier that works below 1 K. We report on a test of a commercial SQUID amplifier that has lower noise than others we have tested,...

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Bibliographic Details
Published in:Review of scientific instruments 1993-05, Vol.64 (5), p.1319-1323
Main Authors: Geng, Z. K., Adams, P. W., Hamilton, W. O., Johnson, W. W., Solomonson, N. D.
Format: Article
Language:English
Subjects:
661310 - Relativity & Gravitation- (1992-)
665412 - Superconducting Devices- (1992-)
AMPLIFIERS
Applied sciences
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRONIC EQUIPMENT
Electronics
ENERGY RESOLUTION
Exact sciences and technology
FLUXMETERS
GRAVITATIONAL WAVE DETECTORS
MAGNETIC FLUX
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
RADIATION DETECTORS
RESOLUTION
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
SENSITIVITY
SIGNAL-TO-NOISE RATIO
SQUID DEVICES
SUPERCONDUCTING DEVICES
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Summary:For detection of weak signals, and for use on ultralow temperature experiments, it would be useful to have a robust superconducting quantum interference device (SQUID) amplifier that works below 1 K. We report on a test of a commercial SQUID amplifier that has lower noise than others we have tested, and works well while attached to a 50‐mK chamber. The SQUID noise was improved only modestly when cooled from 4 K to 50 mK. The best energy resolution measured was 2200 ℏ.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1144086