TEMPERATURE DEPENDENT AC LOSS MEASUREMENTS ON NbTi AND Nb3Sn SUPERCONDUCTORS BETWEEN 4.2 K AND 1.8 K

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Abstract
AC loss measurements on NbTi and bronze-diffused reacted Nb3Sn multifilamentary superconductors are described as a function of applied triangular pulse magnet fields within the low-frequency region (f < 5 Hz) for temperatures in the range between 4.2 K and 1.5 K. To study the loss behavior with 1.8 K helium II cooling compared to helium-bath cooling at 4.2 K, two typical representatives of superconducting composite samples, the EURATOM-LCT conductor and a Nb3-Sn flat cable, were chosen. The results obtained for the losses at 1.8 K and normalized to 4.2 K show a slow increase with increased field change rate and a different behavior for field amplitudes smaller than the penetration field Hp ≈ 1/2 d · jC (d = filament diameter). Responsible hysteresis and eddy current loss terms are discussed

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