W. Goldacker et al., Properties of internally stranded RBB (ring bundle barrier) low AC loss BSCCO tapes made by PITAR route, IEEE APPL S, 11(1), 2001, pp. 2947-2950
The novel RBB-BSCCO tape design resembling a Rutherford cable structure for
tow AC losses was improved with respect to the conductor geometry and the
superconducting properties in combination with a low level of AC losses. Th
e PITAR route (Powder In Tube Assemble and React) allows economical prepara
tion of a stranded conductor composite with techniques similar to standard
BSCCO tapes. The advantage is a very effective twist application to the str
ands and low geometrical distortions to the filament cross sections. I)atn
of the transport current anisotropy and current homogeneity (by MOI) for di
fferently twisted conductors are presented. Transport currents up to 9 kAcm
(-2) were achieved. Filament twist pitches down to 3.4 mm were realized and
the achieved effective decoupling of the strands shifts the maximum of the
AC losses in perpendicular external AC fields to frequency values above 50
0 Hz This was at the first time realized for a BSCCO conductor.