ELECTRICAL CIRCUIT MODELS AMONG SUPERCONDUCTING STRANDS IN REAL-SCALECICCS

Stability margin of the cable-in-conduit conductor is greatly influenc ed with current transfer performance among strands. When we estimate t he stability margin analytically, me must assume the electrical circui t model among strands, but it is difficult to know it in the real-scal e cables, because the cable has many parallel circuits with a lot of s trands and twisted stages. The measurment of the frequency characteris tics of impedance among strands shows that the circuit can be regarded as two wire model, By this measurement me can judge either the circui t behaves like a distributed constant circuit or a lumped element circ uit within the intended frequency band, When the circuit is a lumped. element circuit, we can also get the interval distance between each co ntact point and its resistance. This paper also describes that stable conductors are often represented with a lumped element circuit that ha s well-contacted points with short interval.