Magnetic flux-enhanced control line for superconducting flux flow transistor

摘要

A magnetic flux-enhanced control line for a superconducting flux flow transistor (SFFT). The SFFT includes a pair of superconducting electrodes which provide a voltage output, a region of weakened superconductor connecting the electrodes and a control line. The region of weakened superconductor carries a current Ibody and the control line carries a current IControl. The control line further has a portion thereof proximate the weakened region for providing a localized magnetic field through the weakened region as a function of IControl. The magnetic flux through the weakened region induces vortices therein which have a resistance ro. The proximate portion of the control line forms a tortuous current path whereby the magnetic flux through the weakened region is increased for increasing ro so that the output voltage of the transistor is increased without increasing IControl.