1. 3 KHz SQUID Receiver Development.
- Author
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S H E CORP SAN DIEGO CA, Simmonds,M B, Fertig,W A, Giffard,R P, S H E CORP SAN DIEGO CA, Simmonds,M B, Fertig,W A, and Giffard,R P
- Abstract
We have designed and tested a model for a 3 kHz receiver using a superconducting antenna circuit and a SQUID (Superconducting QUantum Interference Device) amplifier. Q factors as high as 6400 have been demonstrated for the resonant antenna, giving it an extremely low intrinsic noise voltage. We have anlayzed and solved various problems of matching between antenna and SQUID, as well as measuring noise, contributed by materials in the surrounding cryostat. We have been able to use feedback from the SQUID amplifier into the antenna to effectively broaden the 3 dB bandwidth to 1200 Hz without raising the noise level of the system significantly. By scaling the results obtained with our model receiver to an antenna volume of .022 M-cubed we have been able to estimate that a noise level of 2.4 x 10 to the -17th power T/(sq.rt. Hz) could be obtained in a 100 Hz bandwidth. (Author)
- Published
- 1978