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SQUID readout electronics and magnetometric systems for practical applications /

The working principles and phenomena the SQUID technology is based on are not so easy to understand by those, who want to use the technology for specific applications. This book builds a bridge for scientists and engineers to fill potential know-how gaps for all working together on SQUID systems and...

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Bibliographic Details
Main Authors: Zhang, Yi (Author), Xie, Xiaoming (Author), Dong, Hui (Author), Zhang, Guofeng (Author), Krause, Hans-Joachim (Author)
Format: eBook
Language:English
Published: Weinheim, Germany : Wiley-VCH, [2020]
Subjects:
Superconducting quantum interference devices.
Electronics.
Electronic books.
Online Access:Connect to the full text of this electronic book
Table of Contents:
  • Cover
  • Title Page
  • Copyright
  • Contents
  • Preface
  • Acknowledgments
  • Chapter 1 Introduction
  • 1.1 Motivation
  • 1.2 Contents of the Chapters
  • References
  • Chapter 2 Josephson Junctions
  • 2.1 Josephson Equations
  • 2.2 RCSJ Model
  • References
  • Chapter 3 dc SQUID's I-V Characteristics and Its Bias Modes
  • 3.1 SQUID's I-V Characteristics
  • 3.2 An Ideal Current Source
  • 3.3 A Practical Voltage Source
  • References
  • Chapter 4 Functions of the SQUID's Readout Electronics
  • 4.1 Selection of the SQUID's Bias Mode
  • 4.2 Flux Locked Loop (FLL)
  • 4.2.1 Principle of the FLL
  • 4.2.2 Electronic Circuit of the FLL and the Selection of the Working Point
  • 4.2.3 Locked and Unlocked Cases in the FLL
  • 4.2.4 Slew Rate of the SQUID System
  • 4.3 Suppressing the Noise Contribution from the Preamplifier
  • 4.4 Two Models of a dc SQUID
  • References
  • Chapter 5 Direct Readout Scheme (DRS)
  • 5.1 Introduction
  • 5.2 Readout Electronics Noise in DRS
  • 5.2.1 Noise Characteristics of Two Types of Preamplifiers
  • 5.2.2 Noise Contribution of a Preamplifier with Different Source Resistors
  • 5.3 Chain Rule and Flux Noise Contribution of a Preamplifier
  • 5.3.1 Test Circuit Using the Same Preamplifier in Both Bias Modes
  • 5.3.2 Noise Measurements in Both Bias Modes
  • 5.4 Summary of the DRS
  • References
  • Chapter 6 SQUID Magnetometric System and SQUID Parameters
  • 6.1 Field-to-Flux Transformer Circuit (Converter)
  • 6.2 Three Dimensionless Characteristic Parameters, c, , and L, in SQUID Operation
  • 6.2.1 SQUID's Nominal Stewart-McCumber Characteristic Parameter c
  • 6.2.2 SQUID's Nominal Thermal Noise Parameter
  • 6.2.3 SQUID's Screening Parameter L
  • 6.2.4 Discussion on the Three Characteristic Parameters
  • References
  • Chapter 7 Flux Modulation Scheme (FMS)
  • 7.1 Mixed Bias Modes
  • 7.2 Conventional Explanation for the FMS
  • 7.2.1 Schematic Diagram of the FMS
  • 7.2.2 Time Domain and Flux Domain
  • 7.2.3 Flux Modulation
  • 7.2.4 Five Additional Notes
  • 7.3 FMS Revisited
  • 7.3.1 Bias Mode in FMS
  • 7.3.2 Basic Consideration of Synchronous Measurements of Is and Vs
  • 7.3.3 Experimental Synchronous Measurements of [delta]i and VRs
  • 7.3.4 Transfer Characteristics of the Step-Up Transformer
  • 7.3.5 V Comparison Obtained by DRS and FMS
  • 7.4 Conclusion
  • References
  • Chapter 8 Flux Feedback Concepts and Parallel Feedback Circuit
  • 8.1 Flux Feedback Concepts and History
  • 8.2 SQUID's Apparent Parameters
  • 8.3 Parallel Feedback Circuit (PFC)
  • 8.3.1 Working Principle of the PFC in Current Bias Mode
  • 8.3.2 Working Principle of PFC in Voltage Bias Mode
  • 8.3.3 Brief Summary of Qualitative Analyses of PFC
  • 8.4 Quantitative Analyses and Experimental Verification of the PFC in Voltage Bias Mode
  • 8.4.1 The Equivalent Circuit with the PFC in Voltage Bias Mode
  • 8.4.2 Introduction of Two Dimensionless Parameters r and
  • 8.4.3 Numerical Calculations
  • 8.4.4 Experimental Results