Thermal stability properties of YBa2Cn3O7 coated conductor tape under the cryocooling condition

K. Watanabe, V. R. Romanovskii, R. Ishihara, G. Nishijima, S. Awaji, I. Inoue, H. Sakamoto, M. Mimura, S. Nagaya

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


From the viewpoint of a cryogen-free high-field superconducting magnet, the thermal stability properties of YBa2Cu3O7 (Y123) coated conductor tapes before thermal runaway are examined under the conduction-cooling condition by a GM-cryocooler. Under such cryocooling condition, Ag-sheathed Bi2Sr2CaCu2O8 (Bi2212) wires with Jc ∼ 104 A/cm2 reveal stable behaviors of 3 times larger current properties before thermal runaway than critical currents, although conventional Nb3Sn wires with J c ∼ 104 A/cm2 quench almost at their critical currents under the cryocooling condition. In order to determine the maximum current-carrying capacity of the Y123 tape in high fields, we use a zero-dimensional heat balance model. On the basis of the measured basic properties for the Y123 tape, the calculations were done at B2 = 20 T, bath temperature T0 = 4.2 K, Jc ∼ 10 7A/cm2, and cryocooling heat transfer coefficient h = 10-3 W/cm2K. We found that the Y123 tape with J c ∼ 107 A/cm2 does not have the over-critical current but rather the sub-critical current before thermal runaway.

Original languageEnglish
Article number5643196
Pages (from-to)2449-2452
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number3 PART 2
Publication statusPublished - 2011 Jun


  • Critical current property
  • Cryogen-free superconducting magnet
  • High field
  • Thermal stability
  • YBa CuO coated conductor


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