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Title: High-temperature superconducting quantum interference device with cooled LC resonant circuit for measuring alternating magnetic fields with improved signal-to-noise ratio

Abstract

Certain applications of superconducting quantum interference devices (SQUIDs) require a magnetic field measurement only in a very narrow frequency range. In order to selectively improve the alternating-current (ac) magnetic field sensitivity of a high-temperature superconductor SQUID for a distinct frequency, a single-coil LC resonant circuit has been used. Within the liquid nitrogen bath, the coil surrounds the SQUID and couples to it inductively. Copper coils with different numbers of windings were used to cover the frequency range from <1 to nearly 100 kHz. A superconducting coil made of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} tape conductor was also tested. With the LC circuit, the signal-to-noise ratio of measurements could be improved typically by one order of magnitude or more in a narrow frequency band around the resonance frequency exceeding a few kilohertz. The best attained equivalent magnetic field resolution was 2.5 fT/{radical}Hz at 88 kHz. The experimental findings are in good agreement with mathematical analysis of the circuit with copper coil.

Authors:
; ; ; ;  [1];  [2];  [3]
  1. Institute of Bio- and Nanosystem (IBN-2), Research Center Juelich, D-52425 Juelich (Germany) and Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092 (China)
  2. (IBN-2), Research Center Juelich, D-52425 Juelich (Germany)
  3. (Germany)
Publication Date:
OSTI Identifier:
20953454
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 78; Journal Issue: 5; Other Information: DOI: 10.1063/1.2735561; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALTERNATING CURRENT; BARIUM COMPOUNDS; COPPER; HIGH-TC SUPERCONDUCTORS; KHZ RANGE 01-100; LIQUIDS; MAGNETIC FIELDS; MAGNETOMETERS; NITROGEN; RESOLUTION; SIGNAL-TO-NOISE RATIO; SQUID DEVICES; SUPERCONDUCTING COILS; TEMPERATURE RANGE 0400-1000 K; YTTRIUM COMPOUNDS

Citation Formats

Qiu Longqing, Zhang Yi, Krause, Hans-Joachim, Braginski, Alex I., Usoskin, Alexander, Institute of Bio- and Nanosystem, and European High Temperature Superconductors GmbH and Co. KG, D-63450 Hanau. High-temperature superconducting quantum interference device with cooled LC resonant circuit for measuring alternating magnetic fields with improved signal-to-noise ratio. United States: N. p., 2007. Web. doi:10.1063/1.2735561.
Qiu Longqing, Zhang Yi, Krause, Hans-Joachim, Braginski, Alex I., Usoskin, Alexander, Institute of Bio- and Nanosystem, & European High Temperature Superconductors GmbH and Co. KG, D-63450 Hanau. High-temperature superconducting quantum interference device with cooled LC resonant circuit for measuring alternating magnetic fields with improved signal-to-noise ratio. United States. doi:10.1063/1.2735561.
Qiu Longqing, Zhang Yi, Krause, Hans-Joachim, Braginski, Alex I., Usoskin, Alexander, Institute of Bio- and Nanosystem, and European High Temperature Superconductors GmbH and Co. KG, D-63450 Hanau. Tue . "High-temperature superconducting quantum interference device with cooled LC resonant circuit for measuring alternating magnetic fields with improved signal-to-noise ratio". United States. doi:10.1063/1.2735561.
@article{osti_20953454,
title = {High-temperature superconducting quantum interference device with cooled LC resonant circuit for measuring alternating magnetic fields with improved signal-to-noise ratio},
author = {Qiu Longqing and Zhang Yi and Krause, Hans-Joachim and Braginski, Alex I. and Usoskin, Alexander and Institute of Bio- and Nanosystem and European High Temperature Superconductors GmbH and Co. KG, D-63450 Hanau},
abstractNote = {Certain applications of superconducting quantum interference devices (SQUIDs) require a magnetic field measurement only in a very narrow frequency range. In order to selectively improve the alternating-current (ac) magnetic field sensitivity of a high-temperature superconductor SQUID for a distinct frequency, a single-coil LC resonant circuit has been used. Within the liquid nitrogen bath, the coil surrounds the SQUID and couples to it inductively. Copper coils with different numbers of windings were used to cover the frequency range from <1 to nearly 100 kHz. A superconducting coil made of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} tape conductor was also tested. With the LC circuit, the signal-to-noise ratio of measurements could be improved typically by one order of magnitude or more in a narrow frequency band around the resonance frequency exceeding a few kilohertz. The best attained equivalent magnetic field resolution was 2.5 fT/{radical}Hz at 88 kHz. The experimental findings are in good agreement with mathematical analysis of the circuit with copper coil.},
doi = {10.1063/1.2735561},
journal = {Review of Scientific Instruments},
number = 5,
volume = 78,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}