Development of Robust HTS-SQUID for Non-destructive Inspection System in Unshielded Environment

11th European Conference on Applied Superconductivity

Yoshida, K.^1 ; Kage, T.^1 ; Suzuki, T.^1 ; Hatsukade, Y.^1 ; Tanaka, S.^1

Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Aichi, Toyohashi

441-8580, Japan^1

关键词: AC magnetic fields;    DC SQUID magnetometers;    Field amplitudes;    Flip-chip configurations;    Low magnetic fields;    Non destructive inspection;    Pick-up coils;    Unshielded environment;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/4/042049/pdf
DOI  :  10.1088/1742-6596/507/4/042049

来源: IOP

【 摘 要 】

Cross-shaped YBa2Cu3O7-x(YBCO) film was overlapped on directly-coupled multi-pickup-coil HTS-dc-SQUID magnetometer in flip-chip configuration as a superconducting shield, and the characterestics of the SQUID were examined in DC and AC magnetic fields. We created slots in the YBCO film and pickup-coil of HTS-SQUID magnetometer for suppression of flux trapping. In low magnetic field environment, we measured the characteristics of the SQUID without and with HTS film. The most of the parameters were same with and without the HTS films, while S1/2φwith the HTS film was a bit smaller than that of the bare SQUID. In the DC field, Icof the HTS-SQUID covered with the HTS film did not change until a DC field over 140 μT was applied to the SQUID, while the bare SQUID's Icdecreased with the increase of the applied DC field. In the AC fields at 10 MHz, the SQUID with the HTS film showed degradation of the parameters such as Vppand S12φat lower field amplitude than the bare SQUID.