Design of a 0.2 MJ conduction cooled Nb-3,Sn SMES system

Superconducting Magnetic Energy Storage (SMES) system can be used to develo p methods for improving power quality where a short interruption of power c ould lead to a long and costly shutdown. The commercialized mu-SMES concept s are based on NbTi technology. Nb,Sn has excellent superconducting propert ies but unfortunately it is extremely brittle and usually the coils are mad e with the time consuming wind and react method. On the other hand, a Nb,Sn magnet enables a coil operating temperature around 10 K. Considerable adva nces in cryocooler technology have been made during the past ten years - pu shed partly by the progress of HTS technology. Therefore a Nb,Sn coil with a reliable cryocooler unit could be a preferable alternative when designing different kind of magnet systems. Based on these viewpoints a cryogen free Nb,Sn SMES system operating at 10 K has been designed in order to compensa te a short term loss of power.