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Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish
07:47

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Published on: March 18, 2019

High-performance UHF SQUID magnetometer.

A Long1, T D Clark, R J Prance

  • 1School of Mathematical and Physical Sciences, University of Sussex, Brighton, BN1 9QH, United Kingdom.

The Review of Scientific Instruments
|November 1, 1979
PubMed
Summary
This summary is machine-generated.

We developed a stabilized point contact superconducting quantum interference device (SQUID) magnetometer with high sensitivity. This advanced magnetometer achieves excellent energy sensitivity for precise measurements.

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Area of Science:

  • Physics
  • Superconducting Devices
  • Magnetometry

Background:

  • Superconducting Quantum Interference Devices (SQUIDs) are sensitive magnetic flux detectors.
  • Point contact SQUIDs offer unique properties but require stabilization.
  • High-frequency operation and low-noise preamplification are crucial for enhanced performance.

Purpose of the Study:

  • To describe a novel lumped-component stabilized point contact SQUID magnetometer.
  • To detail the system's operational parameters and components.
  • To report the achieved flux and energy sensitivity.

Main Methods:

  • Utilized a point contact SQUID design with lumped-component stabilization.
  • Operated the SQUID at a bias frequency of 430 MHz.
  • Employed a cooled Gallium Arsenide Field-Effect Transistor (GaAs FET) preamplifier at 4.2 K.
  • Implemented a full-bandwidth (5-10 MHz) flux-locked loop.

Main Results:

  • Achieved an overall flux sensitivity of 1x10(-5) Phi0/(Hz)(1/2).
  • Demonstrated an energy sensitivity of approximately 4.5x10(-31) J/Hz.
  • The system exhibited stable operation with a wide flux-locked loop bandwidth.

Conclusions:

  • The developed SQUID magnetometer offers high sensitivity and stability.
  • The combination of a stabilized point contact, high-frequency bias, and FET preamplifier is effective.
  • This technology has potential applications in sensitive magnetic field detection.