Magnetic shielding properties of HTc superconductor

Matsuba, H.; Yahara, A.; Irisawa, Daiichi

doi:10.1088/0953-2048/5/1s/100

Cited by 33 publications

(16 citation statements)

References 1 publication

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“…4 Until recently, HTS shields have been made out of bulk materials. 5,[8][9][10] The significant progress in manufacturing the second generation ͑2G͒ coated conductors 11,12 has opened a possibility that they can be used as a material for magnetic screens. A recent study 13 reported the use of YBCO coated conductors to attenuate ac magnetic fields at low frequencies ͑10-100 Hz͒.…”

Section: Introductionmentioning

confidence: 99%

Use of second generation coated conductors for efficient shielding of dc magnetic fields

Fagnard

Dirickx

Levin

et al. 2010

Journal of Applied Physics

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This paper reports the results of an experimental investigation of the performance of two types of magnetic screens assembled from YBa 2 Cu 3 O 7−␦ ͑YBCO͒ coated conductors. Since effective screening of the axial dc magnetic field requires the unimpeded flow of an azimuthal persistent current, we demonstrate a configuration of a screening shell made out of standard YBCO coated conductor capable to accomplish that. The screen allows the persistent current to flow in the predominantly azimuthal direction at a temperature of 77 K. The persistent screen, incorporating a single layer of superconducting film, can attenuate an external magnetic field of up to 5 mT by more than an order of magnitude. For comparison purposes, another type of screen which incorporates low critical temperature quasipersistent joints was also built. The shielding technique we describe here appears to be especially promising for the realization of large scale high-T c superconducting screens.

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Section: Introductionmentioning

confidence: 99%

Use of second generation coated conductors for efficient shielding of dc magnetic fields

Fagnard

Dirickx

Levin

et al. 2010

Journal of Applied Physics

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“…the maximum induction that can be strongly attenuated by the shield [1], [2]. Manuscript A number of results can be found in the literature on the magnetic shielding properties of bulk polycrystalline tubes [5], [6], [8]. In our previous work in particular [1], [2], we have studied the magnetic shielding of a Bi-2223 polycrystalline tube subjected to an axial field.…”

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confidence: 99%

DC and AC Shielding Properties of Bulk High-Tc Superconducting Tubes

Fagnard

Denis

Lousberg

et al. 2009

IEEE Trans. Appl. Supercond.

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Abstract-We have studied numerically and experimentally the magnetic flux penetration in highsuperconducting tube subjected to a uniform magnetic field parallel to its long axis. This study is carried in view of designing low-frequency magnetic shields by exploiting the diamagnetic properties of high-superconducting ceramics. We have measured the field attenuation for applied magnetic fields in the frequency range 5 mHz-0.1 Hz by Hall probe measurements and at audio frequencies using a sensing coil. A simple 1D analysis using the Kim critical state model was found to be able to reproduce the experimental data satisfactorily. We have also determined the phase shift between the internal and the applied field both experimentally and numerically. Finally, we have studied the sweep rate dependence of the magnetic shielding properties, using data recorded either at several constant sweep rates d d or at several AC fields of various amplitudes and frequencies. Both methods agree with each other and lead to a -value of the n law equal to 40 at 77 K.

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“…Superconducting shields can be made smaller in size and lighter than shields made of ferromagnetic metals because of their higher saturation induction in constant magnetic fields and thinner than shields made of nonmagnetic high conductivity metals because of the stronger skin effect in low frequency alternating magnetic fields. Magnetic shielding properties of BSCCO-2212 bulk cylinder were reported by Matsuba et al [1]. The shielding factor of the cylinder did not exhibit any frequency dependence.…”

Section: Introductionmentioning

confidence: 60%

“…It is not clear if the difference is due to the difference in the optimization of processing conditions or the difference is inherent in the materials. Matsuba et al [1] did not observe any frequency dependence of shielding properties in their study on bulk Bi-2212. It appears that coils of 2G behave similar to bulk material in shielding magnetic fields.…”

Section: Resultsmentioning

confidence: 81%

Shielding of AC Magnetic Fields by Coils and Sheets of Superconducting Tapes

Kvitkovič

Voccio

Pamidi

2009

IEEE Trans. Appl. Supercond.

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Magnetic field shielding properties of coils and sheets of silver sheathed (Bi Pb) 2 Sr 2 Ca 2 Cu 3 O 10+x tapes (1G superconductor tapes) and YBa 2 Cu 3 O 7 coated conductors (2G superconductor tapes) are reported. Shielding properties were measured at 77 K, with varying field amplitude and frequency of external magnetic field, using Hall probes and a phase sensitive technique. Shielding factor data on several coils and sheets are presented as a function of external field amplitude and frequency. Magnetic field shielding of up to 50% was observed at field amplitudes of 10 mT. Differences in frequency dependence of shielding properties of test shields fabricated from 1G and 2G conductors are discussed.

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Magnetic shielding properties of HTc superconductor

Cited by 33 publications

References 1 publication

Use of second generation coated conductors for efficient shielding of dc magnetic fields

Use of second generation coated conductors for efficient shielding of dc magnetic fields

DC and AC Shielding Properties of Bulk High-Tc Superconducting Tubes

Shielding of AC Magnetic Fields by Coils and Sheets of Superconducting Tapes

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