Dissipation in a Superconducting Indium Wire
A superconducting device which has evolved into several useful forms is the persistatron.1 Recently the persistatron has been modified into a coupled superconducting circuit in which the two branches of the device are deliberately made interacting.2 This multiply connected, self-interacting superconducting circuit is referred to as a “coupled persistatron.” A current i s in a coil of inductance L produces a field H s at a wire centered in the coil. Thus a transport current i w carried by the wire is influenced by i s . The behavior of the system, that is, the apportionment of the currents i s and i w between the two branches, can be predicted by using only the princples that (a) a dissipation-producing flow apportionment is dynamically unstable against a lossless apportionment whenever the latter is possible for a given total current, and (b) the quantization of system energy due to flux conservation when the multiply connected system is in the superfluid state prevents any further current changes once a lossless flow pattern has been attained. Previous experimental results in this laboratory for i s and i w as a function of input current I = i s + i w agree very well with the theoretical predictions.2
KeywordsWire Diameter Previous Experimental Result Threshold Point Longitudinal Field Axial Wire
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- 1.M.J. Buckingham, in Proc. 5th Intern. Conf. Low Temperature Physics and Chemistry, University of Wisconsin Press, Madison (1958), p. 229.Google Scholar