Development of high temperature superconducting coils using Bi-2223/Ag tapes
Four double wound pancakes with inner diameters of 98 mm have been successfully fabricated with multifilamentary Bi-2223/Ag tape using the react and wind technique. Two pancakes were impregnated with wax and the other two with resin. The pancakes have been tested at 77 K producing critical current (...
| Main Authors: | , , , , |
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| Format: | Conference item |
| Published: |
1999
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| Summary: | Four double wound pancakes with inner diameters of 98 mm have been successfully fabricated with multifilamentary Bi-2223/Ag tape using the react and wind technique. Two pancakes were impregnated with wax and the other two with resin. The pancakes have been tested at 77 K producing critical current (I-C) values up to 14.5 A and index of transition values (n) of up to 11.4. The field profiles produced by the pancakes have been modelled. The I-C field dependence of short samples of the component Bi-2223/Ag tape has been studied. I-C is most sensitive to field when the field is parallel to the c-axis of the tape, reducing I-C from 28 A to 13.2 A between 0 T and 30 mT. Although the bending strain of the tape in the coil is similar to 0.3%, the Fabrication procedure for the pancakes has produced very little handling damage to the tapes. It is demonstrated that the I-C of the coils is almost entirely self field limited. |
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