Title :
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
fDate :
6/1/1997 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
