英国物理学会
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作者:J-F Fagnard , L Wéra ...
来源:[J].Superconductor Science and Technology(IF 2.758), 2015, Vol.28 (3)IOP
摘要:Bulk type-II irreversible superconductors can act as excellent passive magnetic shields, with a strong attenuation of low frequency magnetic fields. Up to now, the performances of superconducting magnetic shields have mainly been studied in a homogenous magnetic field, considerin...
作者:J-F Fagnard , P Vanderbemden
来源:[J].Superconductor Science and Technology(IF 2.758), 2015, Vol.28 (7)IOP
摘要:MgB2 in bulk form shows great promise as trapped field magnets (TFMs) as an alternative to bulk (RE)BCO materials to replace permanent magnets in applications such as rotating machines, magnetic bearings and magnetic separation, and the relative ease of fabrication of ...
作者:J-F Fagnard , G A Levin ...
来源:[J].Superconductor Science and Technology(IF 2.758), 2015, Vol.28 (7)IOP
摘要:Persistent current loops of arbitrary size can be made from currently manufactured RE123 coated conductors. Our previous work has shown that an assembly of such loops is able to effectively shield quasi static axial magnetic field due to the absence of a resistive joint. The shie...
作者:J-F Fagnard , H Zhang ...
来源:[J].Journal of Physics D: Applied Physics(IF 2.528), 2016, Vol.49 (11)IOP
摘要:Superconducting flux pumps are the kind of devices which can generate direct current into superconducting circuit using external magnetic field. The key point is how to induce a dc voltage across the superconducting load by ac fields. Giaever (1966 IEEE Spectr . 3 117 ) pointed o...
作者:J-F Fagnard , A R Dennis ...
来源:[J].Superconductor Science and Technology(IF 2.758), 2015, Vol.28 (9)IOP
摘要:Bulk, high temperature superconductors have significant potential for use as powerful permanent magnets in a variety of practical applications due to their ability to trap record magnetic fields. In this paper, soft ferromagnetic sections are combined with a bulk, large grai...
作者:J-F Fagnard , L Wéra ...
来源:[J].Superconductor Science and Technology(IF 2.758), 2018, Vol.31 (1)IOP
摘要:Hard type-II hollow superconductors are well suited for low frequency magnetic shielding. The properties and performances of superconducting magnetic shields subjected to homogeneous magnetic fields have been extensively discussed in the literature. In the present work, we invest...
作者:J-F Fagnard , S Elschner ...
来源:[J].Superconductor Science and Technology(IF 2.758), 2010, Vol.23 (9), pp.095012 (8pp)IOP
摘要:We show that tubes of melt cast Bi-2212 used as current leads for LTS magnets can alsoact as efficient magnetic shields. The magnetic screening properties under an axial DCmagnetic field are characterized at several temperatures below the liquid nitrogentemperature (77 K). T...
作者:J-F Fagnard , M Ausloos ...
来源:[J].Superconductor Science and Technology(IF 2.758), 2010, Vol.23 (7), pp.075006 (12pp)IOP
摘要:In the present work we study, both theoretically and experimentally, the temperatureincrease in a bulk high temperature superconductor subjected to applied ACmagnetic fields of large amplitude. We calculate analytically the equilibriumtemperatures of the bulk sample as a function...
作者:J-F Fagnard , M Ausloos ...
来源:[J].Journal of Physics: Conference Series, 2010, Vol.234 (1), pp.012023 (9pp)IOP
摘要:The trapped magnetic field is examined in bulk high-temperature superconductors that are artificially drilled along their c -axis. The influence of the hole pattern on the magnetization is studied and compared by means of numerical models and Hall probe mapping techniques. ...

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