Application of high performance DC SQUIDs in precision measurement technique

Author

Vodel, W. ; Koch, H. ; Seidel, P. ; Bluthner, K. ; Weber, P.

Author_Institution

Inst. fur Festkorperphys., Friedrich-Schiller-Univ., Jena, Germany

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

2152

Lastpage

2155

Abstract

In this review the performance of a DC SQUID system with Nb-NbO/sub x/-Pb/In/Au window-type Josephson junctions is described. The SQUIDs and the SQUID control units were developed for universal applications in precision measurement technique. Under optimum conditions a flux noise level of 2/spl times/10/sup -6/ /spl Phi//sub 0///spl radic/Hz was achieved corresponding to an energy resolution of 3/spl times/10/sup -31/ J/Hz. The contribution gives the design of the DC SQUID device and summarizes recent results of its application in precision measurement technique. The applications include a cryogenic current comparator for non-destructive measurement of the beam intensity produced in a particle accelerator, a high-sensitive SQUID voltmeter for investigations of the low-field Hall coefficient of high purity metals, the upgrade of a multichannel RF SQUID neuromagnetometer for biomagnetic research, and a planned high-precision experiment in fundamental physics.<>

Keywords

Josephson effect; SQUID magnetometers; SQUIDs; biomedical equipment; gold; indium; lead; niobium; niobium compounds; particle beam diagnostics; Nb-NbO-Pb-In-Au; Nb-NbO/sub x/-Pb/In/Au window-type Josephson junctions; SQUID control units; biomagnetic research; cryogenic current comparator; design; energy resolution; flux noise level; fundamental physics; high performance DC SQUID; high purity metals; high-precision experiment; high-sensitive SQUID voltmeter; low-field Hall coefficient; multichannel RF SQUID neuromagnetometer; nondestructive measurement; optimum conditions; particle accelerator; precision measurement technique; Cryogenics; Current measurement; Energy resolution; Gold; Josephson junctions; Measurement techniques; Noise level; Particle beams; Particle measurements; SQUIDs;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403009

Filename

403009