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Chin. Phys. B, 2018, Vol. 27(5): 050701    DOI: 10.1088/1674-1056/27/5/050701
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Optimization of pick-up coils for weakly damped SQUID gradiometers

Kang Yang(杨康)1,2,3, Jialei Wang(王佳磊)1,2,3, Xiangyan Kong(孔祥燕)1,2,3, Ruihu Yang(杨瑞虎)1,2,3, Hua Chen(陈桦)1,2,3
1 State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology(SIMIT), Chinese Academy of Sciences(CAS), Shanghai 200050, China;
2 CAS Center for Excellence in Superconducting Electronics(CENSE), Shanghai 200050, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China
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      Published:  05 May 2018
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)) (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:

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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