Design and realization of an optimal current sensitive CCC

Author

Sese, J. ; Rietveld, Gert ; Camon, Agustin ; Rillo, C. ; Vargas, Luis ; Christian, G. ; Brons, S. ; Flokstra, J. ; Rogalla, Horst ; Altenburg, H.

Author_Institution

Inst. de Ciencia de Mater. de Aragon, Zaragoza Univ.

Volume

48

Issue

2

fYear

1999

fDate

4/1/1999 12:00:00 AM

Firstpage

370

Lastpage

374

Abstract

The sensitivity of an overlapped tube cryogenic current comparator (CCC), coupled to a SQUID by means of a flux transformer, is calculated and compared with measurements. Conditions for optimal coupling between the CCC and the SQUID are derived. Based on these, an optimal CCC for precision measurements of very small currents in the nanoampere range has been designed. The paper describes the construction and testing of some parts of the system. An essential element is a home-made dc SQUID with low current noise and low inductance input coil equal to that of the CCC overlapped shield, which we use as sensing coil

Keywords

SQUIDs; current comparators; electric current measurement; SQUID coupled; cryogenic current comparator; flux transformer; low current noise DC SQUID; low inductance input coil; nanoampere range; optimal coupling conditions; optimal current sensitive; overlapped tube; precision measurements; self-inductance; sensitivity; small currents measurement; very small currents; Cryogenic electronics; Current measurement; Electrons; Frequency; Inductance; Metrology; SQUIDs; Superconducting coils; System testing; Tunneling;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.769603

Filename

769603