Abstract
Shielding efficacy of the high-temperature superconducting (HTS) magnetic shields depends on the superconductor properties and on the orientation of the external magnetic field. For precise magnetic field measurements in areas with changing direction of magnetic noise it is important to reduce both the parallel and perpendicular components of the magnetic field. We have designed and fabricated magnetic shields of 25 cm long paraboloid shape with closed sides from second-generation HTS tapes. We have characterized HTS shields in DC and variable frequency AC magnetic fields at 77 K above a copper electromagnet acting as the source of inhomogeneous magnetic noise. The HTS magnetic shields reduce the magnetic field noise penetration and enhance the sensitivity of magnetic field sensors. The measurements were performed with the magnetic shield placed between the noise source and the sensor. 2D finite element analysis using Comsol model was generated and the results were compared with the experimental data of magnetic field dependences of the shielding factor (SF).
Highlights
The properties of magnetic screens made of various high-temperature superconductors such as Bi-2223, Bi-2212, YBCO, and MgB2 in the form of sheets, coils, tubes, cups or open slit tapes have been studied by researches for several years [1 - 6]
Shielding factors of the long paraboloid magnetic shield were measured as a function of magnetic field magnitude, frequency, and the number of layers in the form of soldered layers made of YBCO superconducting tapes
DC shielding factor dependencies for the 1-3 layer long paraboloid magnetic shield from soldered tapes without sidewalls on the DC magnetic field are plotted in figure 6
Summary
The properties of magnetic screens made of various high-temperature superconductors such as Bi-2223, Bi-2212, YBCO, and MgB2 in the form of sheets, coils, tubes, cups or open slit tapes have been studied by researches for several years [1 - 6]. We measured magnetic shielding factor as a function of the number of layers and soldered or non-soldered tapes in the sidewalls. 4. Results and discussion Shielding factors of the long paraboloid magnetic shield were measured as a function of magnetic field magnitude (all reported AC magnetic field values are RMS values), frequency, and the number of layers in the form of soldered layers made of YBCO superconducting tapes.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
