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Magnetic shield effect simulation of superconducting film shield covering directly coupled HTS dc-SQUID magnetometer
| Title: | Magnetic shield effect simulation of superconducting film shield covering directly coupled HTS dc-SQUID magnetometer |
| Authors: | Terauchi, N. Browse this author | | Noguchi, S. Browse this author →KAKEN DB | | Igarashi, H. Browse this author →KAKEN DB |
| Keywords: | SQUID | | Superconducting film shield | | Numerical analysis |
| Issue Date: | Nov-2011 |
| Publisher: | Elsevier B.V. |
| Journal Title: | Physica C: Superconductivity |
| Volume: | 471 |
| Issue: | 21-22 |
| Start Page: | 1253 |
| End Page: | 1257 |
| Publisher DOI: | 10.1016/j.physc.2011.05.172 |
| Abstract: | An HTS SQUID is a high sensitive magnetic sensor. In recent years, the HTS SQUID is widely used in various applications. In some applications, high robustness with respect to magnetic noise is required to realize stable operation at outside of a magnetic shielding room. The target of this paper is a directly coupled HTS dc-SQUID magnetometer. To enhance the robustness of the SQUID magnetometer, use of a superconducting thin film shield has been proposed. The magnetic field directly penetrating the SQUID ring causes the change of the critical current of Josephson junction, and then the SQUID magnetometer transitions into inoperative state. In order to confirm the magnetic shield effect of the superconducting film shield, electromagnetic field simulation with 3D edge finite element method was performed. To simulate the high temperature superconductor, E-J characteristics and c-axis anisotropy are considered. To evaluate the effect of the superconducting film shield, an external magnetic field which is supposed to be a magnetic noise is applied. From the simulation results, the time transition of the magnetic flux penetrating the SQUID ring is investigated and the effect of the superconducting film shield is confirmed. The amplitude of the magnetic flux penetrating the SQUID ring can be reduced to about one-sixth since the superconducting film shield prevents the magnetic noise from directly penetrating the SQUID ring. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/48041 |
| Appears in Collections: | 情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 野口 聡
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