Coolant flow rate control in a superconducting cable under changing current load

This paper deals with coolant flow rate G(t) control in an ac superconducting cable under a highly changing current load l(t). The advantages of a cable with a flow rate that changes according to an optimum law Gsub(opt)l(t) over a cable with a steady flow rate G, equal to time average value Gsub(opt)l(t), are evaluated on a short cable. These advantages lie in the reduction of the time average heat in-leak by 15 to 100% due to hysteretic losses and of the required superconductor safety factor. (author)