Abstract
The effects of the cooling perimeter on the terminal voltage-current characteristics were investigated for various superconducting strips. When the critical current was higher than the recovery current and when the adhesion between superconducting wires and copper substrate was poor, then the current carrying capacity and the recovery current were found to degrate with decreasing the magnitude of the cooling perimeter. Particularly in case of zero cooling perimeter, the equivalent heat flux obtained was not zero, but of a finite value. This may be thought to be due to the longitudinal thermal conduction in the conductor. Many small voltage jumps, like a step, were often observed in the terminal voltage vs current curves, which was mainly due to the irregularities of the critical current of each wire embedded in the copper substrate and to those of the surface resistance between wires and copper substrate.
