Thermal stability of oxide superconductor at various temperatures

Gen Nishijima, Satoshi Awaji, Satoru Murase, Susumu Shimamoto, Kazuo Watanabe

Research output: Contribution to journalConference articlepeer-review

21 Citations (Scopus)


Quench properties of Bi 2Sr 2CaCu 2O 8/AgMg tape were experimentally investigated under a cryocooled condition in high magnetic fields. The critical current (I c), quench current (I 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.

Original languageEnglish
Pages (from-to)1155-1158
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number1
Publication statusPublished - 2002 Mar
Event17th Annual Conference on Magnet Technology - Geneva, Switzerland
Duration: 2001 Sept 242001 Sept 28


  • Cryocooled
  • Operating temperature
  • Oxide superconductor
  • Quench
  • Thermal stability


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