DC-SQUID preamplifier for DC-SQUID magnetometer

Conference · Tue Feb 28 23:00:00 EST 1989 · IEEE Trans. Magn.; (United States)

OSTI ID:6087702

Koshelets, V P; Matlashov, A N; Serpuchenko, I L; Filippenko, L V; Zhuravlev, Y E

DC-SQUID magnetometer with DC-SQUID preamplifier had been designed and experimentally tested. The total magnetometer noise had been reduced to the intrinsic noise level of the input DC-SQUID and magnetometer cryogenic containment had been minimized by using the DC-SQUID preamplifier. The authors used two identical thin-film DC-SQUIDs with 15 ..mu..m/sup 2/ area resistively shunted Nb-AlO/sub x/-Nb junctions. Two types of DC-SQUIDs interconnections were investigated: through resistor connected in series to coupling coil of the DC-SQUID amplifier. The value of the resistor was chosen near that of the dynamic resistance of the input DC-SQUID. The first type of preamplifier circuit had flux amplification near 20 dB in a wide frequency range. The designed DC-SQUID magnetometer with DC-SQUID preamplifier had a coupled energy sensitivity approx. =3x10/sup 31/ J/Hz in the range from 1 Hz to 30 kHz and about 100 dB dynamic range.

• Research Organization: Institute of Radio Engineering and Electronics AS USSR, Marx avenue 18, 103907 Moscow GSP-3 (SU)
• OSTI ID: 6087702
• Report Number(s): CONF-880812-
• Journal Information: IEEE Trans. Magn.; (United States), Journal Name: IEEE Trans. Magn.; (United States) Vol. 25:2; ISSN IEMGA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLIFIERS
DESIGN
ELECTRONIC EQUIPMENT
EQUIPMENT
FILMS
FLUXMETERS
MAGNETIC FLUX
MAGNETOMETERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
NOISE
SQUID DEVICES
SUPERCONDUCTING COILS
SUPERCONDUCTING DEVICES
THIN FILMS
USES