Optimization of pick-up coils for weakly damped SQUID gradiometers

doi:10.1088/1674-1056/27/5/050701

Abstract The performance of a superconducting quantum interference device (SQUID) gradiometer is always determined by its pick-up coil geometry, such as baseline and radius. In this paper, based on the expressions for the coupled flux threading a magnetometer obtained by Wikswo, we studied how the gradiometer performance parameters, including the current dipole sensitivity, spatial resolution and signal-to-noise ratio (SNR), are affected by its pick-up coil via MatLab simulation. Depending on the simulation results, the optimal pick-up coil design region for a certain gradiometer can be obtained. To verify the simulation results, we designed and fabricated several first-order gradiometers based on the weakly damped SQUID with different pick-up coils by applying superconducting connection. The experimental measurements were conducted on a simple current dipole in a magnetically shielding room. The measurement results are well in coincidence with the simulation ones, indicating that the simulation model is useful in specific pick-up coil design.

Keywords: superconducting quantum interference device (SQUID) gradiometer spatial resolution dipole sensitivity signal-to-noise ratio

Received: 25 December 2017
Revised: 02 March 2018
Accepted manuscript online:

PACS:	07.55.Ge	(Magnetometers for magnetic field measurements)
	85.25.Am	(Superconducting device characterization, design, and modeling)
	85.25.Dq	(Superconducting quantum interference devices (SQUIDs))
	87.55.de	(Optimization)

Fund: Project supported by the Key Project of Shanghai Zhangjiang National Innovation Demonstration Zone of the Special Development Fund,China (Grant No.2015-JD-C104-060) and the National Natural Science Foundation of China (Grant No.61741122).

Corresponding Authors: Xiangyan Kong
E-mail: xykong@mail.sim.ac.cn

Cite this article:

Kang Yang(杨康), Jialei Wang(王佳磊), Xiangyan Kong(孔祥燕), Ruihu Yang(杨瑞虎), Hua Chen(陈桦) Optimization of pick-up coils for weakly damped SQUID gradiometers 2018 Chin. Phys. B 27 050701

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Optimization of pick-up coils for weakly damped SQUID gradiometers

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