Analysis of <i>LC</i>-Resonance in DC SQUID Using Dynamic System Model

Yong-liang, Wang; Zhang, Guofeng; Zhang, Shulin; Xie, Xiaoming

doi:10.1109/tasc.2020.3024229

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…Note that the I-V curves differ from those corresponding to the RSJ (Resistively Shunted Junction) model and there is an undamped resonance corresponding to a voltage of about 70 μV. As expected from the theoretical simulations [ 44 , 45 ], this is due to a high β C value, despite the presence of the damping resistor. However, as can be seen from the I-V characteristics, the resonance is quite far from the working point of the sensor and therefore does not create any problems.…”

Section: Resultsmentioning

confidence: 66%

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Superconducting Quantum Magnetometer Based on Flux Focusing Effect for High-Sensitivity Applications

Vettoliere,

Granata

2024

Sensors

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A superconducting quantum magnetometer for high-sensitivity applications has been developed by exploiting the flux focusing of the superconducting loop. Unlike conventional dc SQUID magnetometers that use a superconducting flux transformer or a multiloop design, in this case, a very simple design has been employed. It consists of a bare dc SQUID with a large washer-shaped superconducting ring in order to guarantee a magnetic field sensitivity BΦ less than one nT/Φ0. The degradation of the characteristics of the device due to an inevitable high value of the inductance parameter βL was successfully compensated by damping the inductance of the dc SQUID. The size of the magnetometer, coinciding with that of the washer, is 5 × 5 mm2 and the spectral density of the magnetic field noise is 8 fT/√Hz with a low frequency noise knee of two Hz. The excellent performance of this simple magnetometer makes it usable for all high-sensitivity applications including magnetoencephalography.

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Section: Resultsmentioning

confidence: 66%

mentioning

confidence: 65%

Superconducting Quantum Magnetometer Based on Flux Focusing Effect for High-Sensitivity Applications

Vettoliere,

Granata

2024

Sensors

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Development of a dc-SQUID Amplifier with Intra-Coil Resistors

Wu,

Lin,

et al. 2024

J Low Temp Phys

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We have developed a dc-SQUID ampli ers with intra-coil resistors based on second-order parallel gradiometers. The measured results show that intra-coil resistors can signi cantly increase the uxvoltage transfer coe cient V Φ as well as smooth out resonances and produce a smooth ux-voltage (V-Φ) characteristic curve. It has been observed through a comparison of various intra-coil damping resistors that the ux-voltage transfer coe cient V Φ as a function of the intra-coil resistors rises as the corresponding electric conductance increase. The measured results of the ux noise at 4.2 K demonstrate explicitly that the ux-voltage transfer coe cient can greatly increase detection sensitivity and successfully reduce the noise contribution from the electronics operating at room temperature.

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Development of A dc-SQUID Amplifier with Intra-coil Resistors

Wu,

Lin,

et al. 2023

Preprint

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We have developed a dc-SQUID amplifiers with intra-coil resistors based on second-order parallel gradiometers. The measured results show that intra-coil resistors can significantly increase the flux-voltage transfer coefficient VΦ as well as smooth out resonances and produce a smooth flux-voltage (V-Φ) characteristic curve. It has been observed through a comparison of various intra-coil damping resistors that the flux-voltage transfer coefficient VΦ as a function of the intra-coil resistors rises as the corresponding electric conductance increase. The measured results of the flux noise at 4.2 K demonstrate explicitly that the flux-voltage transfer coefficient can greatly increase detection sensitivity and successfully reduce the noise contribution from the electronics operating at room temperature.

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Analysis of LC-Resonance in DC SQUID Using Dynamic System Model

Cited by 5 publications

References 13 publications

Superconducting Quantum Magnetometer Based on Flux Focusing Effect for High-Sensitivity Applications

Superconducting Quantum Magnetometer Based on Flux Focusing Effect for High-Sensitivity Applications

Development of a dc-SQUID Amplifier with Intra-Coil Resistors

Development of A dc-SQUID Amplifier with Intra-coil Resistors

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