Stability and normal zone propagation in YBCO CORC cables
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Date
2016
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Publisher
IOP Publishing Ltd
Abstract
In this work, a two layer CORC (Conductor On Round Core) cable was tested for
stability and Normal Zone Propagation (NZP) at 77 K in a liquid nitrogen bath. The cable was
instrumented with voltage taps and wires on each strand over the cable’s central portion (i.e.
excluding the end connections of the cable with the outside world). A heater was placed in the
central zone on the surface of the cable, which allowed pulses of various powers and durations to
be generated. Shrinking (recovering) and expanding (not recovering) normal zones have been
detected, as well as stationary zones which were in thermal equilibrium. Such Stationary
Thermal Equilibrium zones (STE) did not expand or contract, and hit a constant upper
temperature while the heater current persisted; they are essentially a form of Stekly stability.
Overall, the cable showed a high degree of stability. Notably, it was able to carry a current of
0.45Ic cable with maximum temperature of 123 K for one minute without damage.
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Citation
Published version: M Majoros et al 2016 Supercond. Sci. Technol. 29 044006. https://doi.org/10.1088/0953-2048/29/4/044006