Computer model for noise in the dc SQUID

Journal Article · Fri Dec 31 23:00:00 EST 1976 · IEEE Trans. Magn.; (United States)

DOI:https://doi.org/10.1109/TMAG.1977.1059276· OSTI ID:7055779

Tesche, C D; Clarke, J

A computer model for the dc SQUID is described which predicts signal and noise as a function of various SQUID parameters. Differential equations for the voltage across the SQUID including the Johnson noise in the shunted junctions are intergrated stepwise in time. Noise-rounded I-V characteristics are computed as a function of applied flux, PHI/sub a/, and ring inductance, L. A measure of the SQUID response, dV/d PHI/sub a/, is calculated as a function of bias current. Low frequency voltage power spectral densities S/sub v//sup o/ computed for various PHI/sub a/ and L show considerable variation from the corresponding single junction values. The flux resolution (S/sub v//sup o/)/sup /sup 1///sub 2/// (dV/d PHI/sub a/) as a function of bias current is computed for several values of L and PHI/sub a/. The results are in good agreement with experiment.

• OSTI ID: 7055779
• Journal Information: IEEE Trans. Magn.; (United States), Journal Name: IEEE Trans. Magn.; (United States) Vol. MAG-13:1; ISSN IEMGA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPUTER CALCULATIONS
CURRENTS
DIFFERENTIAL EQUATIONS
DIRECT CURRENT
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
EQUATIONS
FLUXMETERS
MAGNETIC FLUX
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
NOISE
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
SQUID DEVICES
SUPERCONDUCTING DEVICES