1:30000 cryogenic current comparator with optimum squid readout

descriptionPublicationkeyboard_double_arrow_right Article , Conference object 01 Apr 2003 Netherlands, Spain, Netherlands Publisher:IEEEJournal:Conference Digest Conference on Precision Electromagnetic Measurements

Authors: Gert Rietveld; Elena Bartolomé; Javier Sesé; Pieter de la Court; Jaap Flokstra; Conrado Rillo; Agustín Camón;

doi: 10.1109/cpem.2002.1034830 , 10.1109/tim.2003.809916

handle: 10261/378038

1:30000 cryogenic current comparator with optimum squid readout

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Abstract

We have developed a 1:30000 winding ratio cryogenic current comparator (CCC) for measurement of small currents, e.g., generated by a single electron transport device. A dedicated low-noise SQUID is used for the readout, which allows reaching a sensitivity close to ideal, that is without loss of sensitivity in the flux transformer coupling the CCC and the SQUID. The CCC-SQUID equivalent current input noise using a 1:30 000 winding ratio is 2.1 fA/Hz1/2, measured down to 0.1 Hz. Room temperature impedance measurements on CCCs appear to be a useful method for the determination of the screening by shields surrounding the CCC as well as for the detection of internal CCC resonances.

Peer reviewed

Countries

Netherlands, Spain, Netherlands

Related Organizations

Delft University of Technology
Netherlands
University of Zaragoza
Spain
University of Twente
Netherlands
Van Swinden Laboratorium
Netherlands
Spanish National Research Council
Spain

Keywords

Cryogenic current comparator (CCC), Single electron transport (SET), Dc SQUID, IR-55878, Current measurement, Inductance measurement

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