Shielding and losses in multifilamentary tapes exposed to perpendicular AC magnetic fields

In multifilamentary high-T/sub c/ tapes for energy transportation, a component of magnetic field is applied normally to the filament surfaces. Since the thickness of any filament of the tape is much smaller than the width (the factor is usually between 10 and 20), it results in large field amplification on the tape surface and consequently a large loss. This problem is studied in detail here, analysing the behavior of Bi 2223/Ag tapes with different structures of the filamentary zone. Experimental data are compared with calculations based on finite element codes. The importance of filament arrangement for AC losses is illustrated.

[1]  S. Farinon,et al.  Ac losses in multifilamentary high-TC tapes due to a perpendicular ac magnetic field , 2000 .

[2]  Pasquale Fabbricatore,et al.  Magnetic flux shielding in superconducting strip arrays , 2000 .

[3]  Angular dependence of AC losses at power frequencies for a stack of Bi2223/Ag tapes , 1999, IEEE Transactions on Applied Superconductivity.

[4]  P. Kováč,et al.  Thermomechanical treatment, structure and transport currents in multicore Bi(2223)/Ag tapes , 1999 .

[5]  Ernst Helmut Brandt,et al.  SUPERCONDUCTOR DISKS AND CYLINDERS IN AN AXIAL MAGNETIC FIELD. I. FLUX PENETRATION AND MAGNETIZATION CURVES , 1998 .

[6]  Ernst Helmut Brandt,et al.  Superconductor disks and cylinders in an axial magnetic field: II. Nonlinear and linear ac susceptibilities , 1998 .

[7]  R. Flükiger,et al.  Alternating magnetic field losses in high-Tc superconducting multifilament tapes with a mixed matrix of Ag and BaZrO3 , 1998 .

[8]  P. Kováč,et al.  Application of two-axial rolling for multicore Bi(2223)/Ag tapes , 1997 .

[9]  Mawatari.  Critical state of periodically arranged superconducting-strip lines in perpendicular fields. , 1996, Physical review. B, Condensed matter.

[10]  Clem,et al.  Hysteretic ac losses and susceptibility of thin superconducting disks. , 1994, Physical review. B, Condensed matter.

[11]  Brandt.  Thin superconductors in a perpendicular magnetic ac field: General formulation and strip geometry. , 1994, Physical review. B, Condensed matter.