Abstract
Liquid helium boil-off experiments were conducted to determine the heat leakage rate of two sinter-forged BSCCO 2223 high-temperature superconductor current leads. The experiments were carried out under both DC and AC conditions and with and without an intermediate heat intercept. Current ranges were 0–500 A for DC tests and 0–1,000 Arms for AC tests. The leads were self-cooled. The results show that magnetic hysteresis (AC) losses for both the BSCCO leads and for a low-temperature superconductor current jumper were small for the current range covered in the present experiments. It has been demonstrated that significant reduction in heat leakage rate (liquid helium boil-off rate) is realized by using BSCCO superconductor leads. At 100 A, the measured heat leakage rate of the BSCCO/copper binary lead was ≈29% of that of a conventional copper lead. Further reduction in liquid helium boil-off rate was achieved by using an intermediate heat intercept. For example, At 500 A, the measured heat leakage rate of the BSCCO/copper binary lead was only 7% of that of the conventional copper lead when an intermediate heat intercept was employed.
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© 1996 Plenum Press, New York
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Cha, Y.S. et al. (1996). Liquid Helium Boil-Off Measurements of Heat Leakage from Sinter-Forged BSCCO Current Leads under DC and AC Conditions. In: Kittel, P. (eds) Advances in Cryogenic Engineering. A Cryogenic Engineering Conference Publication, vol 41. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0373-2_78
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DOI: https://doi.org/10.1007/978-1-4613-0373-2_78
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