Magnetic shielding using high-temperature superconductors
V. Ganesan,Raghavan Srinivasan,S Aswathy,K D Chandrasekaran,B Srinivas,U V Varada Raju,G.V. Subba Rao,Raghavan Gopalan,T Rajasekaran +8 more
TLDR
In this paper, the critical penetration field (CPF) was defined as the value of the applied magnetic field at which a detectable field was observed inside the cylinder, varied from cylinder to cylinder and also with the ageing of the cylinders in the case of YBCO shields.Abstract:
Magnetic shields of various high-temperature superconductors, YBa2Cu3O7−x (YBCO), YBa2Cu3O7−x-Ag composites (random inclusions as well as non-random coatings) and Bi2Sr2Ca2Cu3Ox (BSCCO) were prepared by uniaxial as well as isostatic compression with various dimensions. The shielding properties were measured at 77 K for dc and ac magnetic fields in the range of frequencies from 100 Hz to 10 kHz. The critical penetration field (CPF), defined as the value of the applied magnetic field at which a detectable field was observed inside the cylinder, varied from cylinder to cylinder and also with the ageing of the cylinders in the case of YBCO shields. The highest value of CPF was 16 G at 77 K for YBCO shield prepared by isostatic compression. Even though the stability of BSCCO shields with respect to ageing is good, the CPF values are very low compared to those for YBCO. Detailed studies were performed in the case of YBCO shields. The CPF decreased as a function of time over a period of 90 days. The CPF decreased as the frequency of the applied field was increased. The wave form of the field inside the pot for a sinusoidal applied field was highly distorted and showed the presence of higher harmonics with appreciable amplitude. The wave form was Fourier-analysed to yield the field inside the shield along with the harmonics. The shields with Ag addition seem to give better performance at high fields.read more
Citations
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Journal ArticleDOI
Magnetic shielding and harmonic generation in high-Tc superconducting tubes
TL;DR: In this article, the magnetic shielding and harmonic generation in a sintered Y1Ba2Cu3O7-x tube, subjected to an incident AC magnetic field, has been studied.
Journal ArticleDOI
Superconducting materials for electronic applications
TL;DR: In this paper, a measurement of magnetic fields with Hall-and SQUID-sensors was done with the help of a specially constructed measuring apparatus with Hall and SQUID sensors.
References
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Journal ArticleDOI
The fabrication and characterization of high temperature superconducting magnetic shields
J.W. Purpura,T.R. Clem +1 more
TL;DR: In this paper, the microstructure of polycrystalline YBa/sub 2/Cu/sub 3/O/sub 7-x/ tubes was determined by scanning electron microscopy and X-ray diffractometry.
Journal ArticleDOI
Magnetic Shield of High- T c Oxide Superconductors at 77 K
Koji Shigematsu,Hiroshi Ohta,Kazutomo Hoshino,Takayama Hitoshi,Osamu Yagishita,Shigeru Yamazaki,Hidefusa Takahara,Masakazu Aono +7 more
TL;DR: In this paper, a superconducting Y-Ba-Cu-O vessel was compared with those in a normal state at 290 K by measuring induced voltages in a pick-up coil inside the vessel and the ratio of the magnetic field at 77 K to that at 290 k was as good as 2×10-6 when a magnetic field of 0.03 mT at 1000 Hz was applied to the outside of the vessel.
Journal ArticleDOI
Plasma sprayed high Tc superconducting magnetic shields
TL;DR: In this paper, the magnetic shielding properties of superconducting Y 1 Ba 2 Cu 3 O 7 − x coatings have been studied in the incident field frequency and intensity ranges of 100 Hz to 100 kHz and 0.01 to 3.0 mT, respectively.
Journal ArticleDOI
A superconductive shielding can for high T/sub c/ SQUID
G.J. Cui,Shuang Wang,Hong-Wei Jiang,Jia Li,Chunxi Li,C.D. Lin,R.Z. Liu,Q.L. Zheng,Y.S. Fu,Z.L. Luo,W.C. Qiao +10 more
TL;DR: In this article, the authors have fabricated yttrium-barium-copper-oxygen ceramic superconductive shielding cans and measured the magnetic shielding properties at liquid-nitrogen temperature by using a Hall magnetic sensor and high-T/sub c/SQUID (superconducting quantum interference device).
Journal ArticleDOI
Large magnetic shielding vessels of high-Tc oxide superconductor and squid measurements
Atsushi Koike,Kazutomo Hoshino,Hiroshi Ohta,Hirofumi Kotaka,Eichi Sudoh,Kazuhiko Katoh,Hidefusa Takahara +6 more
TL;DR: In this article, a very large magnetic shielding vessel of high-Tc Bi-Pb-Sr-CaCu-O superconductor was developed and experimentally confirmed that this vessel can reduce a weak magnetic field to −100 dB or 1 10 5.