ELECTRODYNAMICS OF A SUPERCONDUCTING PARALLEL PATH CIRCUIT.
NAVAL RESEARCH LAB WASHINGTON D C
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In order to understand better the behavior of superconductors in electrical circuitry, a detailed study is presented of a circuit composed of two superconducting inductances connected in parallel. This circuit forms a closed superconducting path through which the magnetic flux will remain constant only if the resistance of the superconductor is zero. In this regard, an upper limit for the d. c. resistivity of a superconductor is found by two methods. The first method appears in the literature several times and consists of an attempt to detect the decay of a persistent current. The second method has not been reported previously and consists of an attempt to observe between the two branches a current distribution different from that which conserves the flux linkage. These methods differ in that, in the first method, the persistent current exists entirely within the superconductor whereas, in the second method, the externally supplied current must both enter and leave the superconductor. The transient response of the circuit is investigated also. The flux linkage is verified to remain constant to within an experimental error of about 1 for current changes as short as about 1 microsecond.
- Electrical and Electronic Equipment
- Electricity and Magnetism