Liquid helium boil-off measurements of heat leakage from sinter-forged BSCCO current leads under DC and AC conditions

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:416692

Cha, Y S; Niemann, R C; Hull, J R ^[1]

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1. Argonne National Lab., IL (United States); and others

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 A{sub rms} 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 {approx}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.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 416692
• Report Number(s): CONF-950722--
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
AC SYSTEMS
BISMUTH OXIDES
CALCIUM OXIDES
CONNECTORS
COPPER OXIDES
DC SYSTEMS
ELECTRIC CONDUCTORS
HEAT LOSSES
HIGH-TC SUPERCONDUCTORS
STRONTIUM OXIDES
SUPERCONDUCTING DEVICES