Thermal stability of oxide superconductor at various temperatures

Quench properties of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8//AgMg tape were experimentally investigated under a cryocooled condition in high magnetic fields. The critical current (I/sub c/), quench current (I/sub q/), and minimum quench energy (MQE) were measured at various initial temperatures of 4.2...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2002-03, Vol.12 (1), p.1155-1158
Main Authors: Nishijima, G., Awaji, S., Murase, S., Shimamoto, S., Watanabe, K.
Format: Article
Language:English
Subjects:
Bismuth
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Critical current
Cuprates superconductors (high tc and insulating parent compounds)
Current measurement
Disturbances
ELECTRICAL CONDUCTIVITY
Energy measurement
Exact sciences and technology
Internal energy
MAGNETIC FIELD
Magnetic field measurement
Magnetic fields
Magnetic properties
MATHEMATICAL ANALYSIS
Operating temperature
OXIDES
Physics
QUENCHING MECHANISMS
SPECIFIC HEAT
Strontium
Superconducting films
SUPERCONDUCTIVITY
SUPERCONDUCTORS
Temperature
Temperature dependence
THERMAL STABILITY
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Summary:Quench properties of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8//AgMg tape were experimentally investigated under a cryocooled condition in high magnetic fields. The critical current (I/sub c/), quench current (I/sub q/), and minimum quench energy (MQE) were measured at various initial temperatures of 4.2 K, 10 K, and 20 K and at magnetic fields of 7 T and 9 T. MQE was the minimum disturbance energy enough to make thermal quench and was evaluated from the input energy by a resistive heater. It was found that MQE exhibited the minimum value around 20 K. The temperature margin, difference between the initial temperature and the thermal runaway temperature, decreased monotonously with increase at the operating temperature. Since the temperature dependence of MQE did not agree with that of temperature margin, we focused on the internal energy calculated by integrating specific heat of the sample. The temperature dependence of the internal energy was in agreement with that of MQE qualitatively.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2002.1018606