Noise in a point-contact DC SQUID

Thesis/Dissertation · Wed Dec 31 23:00:00 EST 1986

OSTI ID:7199900

Carroll, K R

Measurements of five point-contact d-c SQUIDs (Superconducting QUantum Interference Devices) are presented. The energy resolution and other parameters of these SQUIDs are examined and compared with the predictions of the Resistively Shunted Junction model. For these SQUIDs, the measured minimum energy resolution was approximately 2 x 10/sup -30/ J/Hz. Excess noise in the point contacts was found to limit the energy resolution of the SQUIDs. The typical parameters and the noise obtained for out point-contact Josephson junctions are compared with the results that have been reported by others. The relatively low critical currents of the point contacts and the effect that the resonant cavity of the point-contact dc AQUID had on the I- characteristics give evidence that Joule heating was present in the junctions.

• Research Organization: Maryland Univ., College Park (USA)
• OSTI ID: 7199900
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CRITICAL CURRENT
CURRENTS
ELECTRIC CONTACTS
ELECTRIC CURRENTS
ELECTRIC HEATING
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
ENERGY RESOLUTION
EQUIPMENT
FLUXMETERS
HEATING
JOSEPHSON JUNCTIONS
JOULE HEATING
JUNCTIONS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
NOISE
PLASMA HEATING
RESISTANCE HEATING
RESOLUTION
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS