35 /spl planck/ two-stage SQUID system for gravity wave detection

Author

Jin, I. ; Amar, A. ; Stevenson, T.R. ; Wellstood, F.C. ; Morse, A. ; Johnson, W.W.

Author_Institution

Dept. of Phys., Maryland Univ., College Park, MD, USA

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

2742

Lastpage

2746

Abstract

We have designed, built and tested a two-stage SQUID measuring system which is primarily intended for use in a 50 mK omnidirectional gravity wave detection system. We fabricated three Nb-Al/AlO/sub x/-Nb trilayer SQUIDs on a single chip: there is one sensor SQUID and two readout SQUIDs which amplify the output of the sensor SQUID. At a temperature of 90 mK, we measured an intrinsic energy sensitivity of the sensor SQUID of /spl epsi//sub v/=S/sub /spl Phi///(2L)=35/spl planck/ at 1 kHz, of which 24/spl planck/ is white noise and 11/spl planck/ is 1/f noise.

Keywords

1/f noise; SQUIDs; aluminium; aluminium compounds; cryogenics; gravitational wave detectors; niobium; superconducting device noise; white noise; 1 kHz; 1/f noise; 90 mK; Nb-Al-AlO-Nb; intrinsic energy sensitivity; omnidirectional gravity wave detection system,; readout SQUIDs; sensor SQUID; trilayer SQUIDs; two-stage SQUID system; white noise; Capacitive sensors; Gravity; Inductance; Resonance; SQUIDs; Superconducting coils; Superconducting device noise; Temperature sensors; Transducers; Vibrations;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.621805

Filename

621805