Relaxation-oscillation-driven dc SQUIDS

Conference · Wed Mar 01 04:00:00 EST 1989 · IEEE Trans. Magn.; (United States)

OSTI ID:6044025

Gudoshnikov, S A; Maslennikov, Y U; Semenov, V K; Snigirev, O V; Vasiliev, A V

Simple and reliable relaxation-oscillation-driven dc SQUIDs have been fabricated with flux-to-voltage transfer factor up to 1 mV/PHI/sub o/ and internal energy sensitivity E/sub v/ = (4 +- 1)x10/sup -31/ J/Hz at frequencies above about 10 Hz, and 1x10/sup -29/(1 Hz/f) J/Hz at lower frequencies. Supplied with the 50-..mu..m-wire 20-turn spiral input coil and 6 cm/sup 2/ pick-up loop, such SQUIDs provided magnetic field sensitivity close to (6 +- 3)x10/sup 15/ T/Hz/sup 1/2/ above 10 Hz. The dynamic range of the magnetometers was close to 1.5x10/sup 7/ Hz/sup 1/2/, and the maximum slew rate, about 10 ..mu..T/s at 0.1 kHz. Successful records of the Earth-ionosphere magnetic resonances have been obtained with these magnetometers housed in a stainless steel transport dewar. A new balanced version of the RO-driven dc SQUID has been suggested with the aim to improve both H and E/sub v/. An analysis and the first measurements have shown a noticeable increase of H with respect to the basic version of the device.

• Research Organization: Dept. of Physics, Moscow State Univ., Moscow 119899 GSP (SU)
• OSTI ID: 6044025
• Report Number(s): CONF-880812-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: 25:2
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
CONTAINERS
DEWARS
EARTH ATMOSPHERE
ELECTRONIC EQUIPMENT
EQUIPMENT
FABRICATION
FLUXMETERS
HIGH ALLOY STEELS
IONOSPHERE
IRON ALLOYS
IRON BASE ALLOYS
MAGNETIC FIELDS
MAGNETOMETERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
PERFORMANCE
PLANETARY IONOSPHERES
SQUID DEVICES
STAINLESS STEELS
STEELS
SUPERCONDUCTING DEVICES