SELF FIELD AC LOSS EXPERIMENTS ON Ag SHEATHED BI(222) TAPES
SELF FIELD AC LOSSES EXPERIMENTS ON Ag Sheathed Bi (2223) TAPES
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The AC self field loss in Bi(2223) Ag-sheathed tapes with different number of filaments has been measured between 7 and 60 HZ by means a simplified experimental setup using lock-in-amplifier. The hysteresis losses of the different tapes is similar to Norris prediction for elliptical@cross-section. Our experimental data shows that, the resistive loss measured does not depend on frequencies. Although to reduce coupling loss, twisting of filaments was introduced to Superconducting tapes. Our experimental results shows that at low self field frequencies, the inductive voltage pick up in twisted tapes was high. This might be due to skin effect on silver sheath material, which contributes to eddy current losses in the tapes.