Title :
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.
fDate :
4/1/1999 12:00:00 AM
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;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
