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CR70 - Introduction to Nb-based SQUID Sensors

Introduction to Nb-based SQUID Sensors

Dietmar Drung
Physikalisch-Technische Bundesanstalt (PTB)
Abbestraße 2-12, 10587 Berlin, Germany
Abstract — The superconducting quantum interference device (SQUID) is a highly sensitive detector for magnetic flux or any quantity that can be efficiently converted into flux. Comprehensive overviews of the fundamentals, technology and applications of SQUIDs and SQUID systems are found in the literature (for example [1-6]). In this paper, a short introduction into the basic function of a SQUID, its operation, and its design for magnetic field and current sensing is given. Due to the focus of this book on Nb-based devices, the large field of devices with high critical temperature (high-Tc SQUIDs) will not be considered here.
Keywords (Index Terms) — Amplifier, current sensor, direct readout, flux-locked loop, flux modulation, gradio¬meter, Josephson junction, magnetometer, noise, SQUID, superconductivity, transformer.
Received: March 02, 2016; Accepted: March 30, 2016. Reference No. CR70; Category 4.
An extended version of this paper will appear in the forthcoming book “Josephson Junctions: History, Devices, and Applications” edited by E. L. Wolf, G. B. Arnold, M. A. Gurvitch, and J. F. Zasadzinski, to be published by Pan Stanford Publishing. The book publicity page will eventually be accessible at and