Optimization of a Low-Tc DC SQUID Amplifier With Tightly Coupled Input Coils

We optimized the design and operation of a low-Tc direct current superconducting quantum interference device (dc SQUID) with an integrated coupling coil of 1.5 muH inductance taking into account typical effects observed for similar devices. Numerical simulations were performed on a model including t...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2009-06, Vol.19 (3), p.199-205
Main Authors: Pleikies, J., Usenko, O., Frossati, G., Flokstra, J.
Format: Article
Language:English
Subjects:
Amplifiers
Applied sciences
Capacitance
Capacitors. Resistors. Filters
Circuit simulation
Coils
current sensors
Design optimization
Devices
Direct current
Electrical engineering. Electrical power engineering
Electromagnets
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Inductance
Interference
Josephson device noise
Josephson junctions
Mathematical models
Numerical simulation
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
SQUIDs
Superconducting coils
Superconducting device noise
Superconducting devices
Superconducting quantum interference devices
Temperature measurement
Various equipment and components
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Summary:We optimized the design and operation of a low-Tc direct current superconducting quantum interference device (dc SQUID) with an integrated coupling coil of 1.5 muH inductance taking into account typical effects observed for similar devices. Numerical simulations were performed on a model including the capacitance of the Josephson junctions, thermal noise of the integrated shunt- and damping- resistors as well as a complex frequency dependent impedance of the SQUID loop originating from the integrated coils. The experimentally and numerically determined characteristics and sensitivity are in good agreement. A minimum additional coupled energy resolution of 700 ( h / 2p ) and 250 ( h / 2p ) was measured at a temperature of 4.2 K and 1.5 K, respectively.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2009.2019662