NDLI: Thermal runaway of a 1 T cryocooler-cooled oxide Superconducting pulsed coil in Ac operation

Content Provider	IEEE Xplore Digital Library
Author	Miyazaki, H. Harada, S. Iwakuma, M. Funaki, K. Hayashi, H. Tomioka, A.
Copyright Year	2002
Abstract	We designed and fabricated a 1 T cryocooler-cooled oxide superconducting pulsed coil with Bi2223 multifilamentary flat wires. Previously we studied temperature dependence of the thermal runaway current of the pulsed coil in dc operation. The thermal runaway current was higher than the critical current that was defined as the current where the electric field 10/sup -4/ V/m was generated on average over the whole length of the conductor. In this paper, we studied the coil temperature and the ac loss dependence of the thermal runaway current in ac operation. We operated the coil at 0.5 to 5 Hz with a sinusoidal-waveform transport current. The initial coil temperature was set between 30 and 100 K. The thermal runaway current decreased monotonically with increasing temperature in a similar way to dc operation. However, in a low temperature region, the thermal runaway current was restricted to a lower level than that in dc operation due to the ac loss. We discuss the frequency dependence of thermal runaway current in ac operation.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1663
Ending Page	1666
Page Count	4
File Size	227774
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Superconducting coils Multifilamentary superconductors Superconducting filaments and wires Thermal conductivity Temperature dependence Conductors Cooling Temperature measurement Frequency dependence EMP radiation effects thermal runaway AC loss HTS pulsed coil oxide-superconductor
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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