Status of the IRIS Superconducting Line Test Station and 1 GW Green Superconducting Line Design and Procurement

IRIS (Innovative Research Infrastructure on applied Superconductivity) is a major project to build a research infrastructure in applied superconductivity, recently approved in Italy and led by INFN. The design and delivery of a Green Superconducting Line (GSL) for power transmission and the construction and commissioning of a test station for GSLs testing are two key deliverables of the project. The test station is under construction at the University of Salerno. It foresees the main building, and a outdoor space for 130 m long cable lodging. Into the building there will be the current and voltage power supplies (40 kA and 50 kV, respectively), a 500 W@20 K He-refrigerator, monitor and control systems and diagnostics for GSLs testing. The facility will be kept open to external institutions and companies engaged in the same research field. The GSL will be 130 m long and designed to carry 40 kA at 20 K, isolated for 25 kV operation, i.e. 1 GW of power, with almost zero dissipation. The GSL will be used for the commissioning of the test station. In this paper we will present the line configuration. We updated the design of the line from a four conductors (two phases and two spares for redundancy) inside the same cryostat configuration to a three conductors (two phases and a spear) each inside its own cryostat, in order to have a better insulation between them in case of failure of one phase. Details and preliminary analysis of the updated line design will be presented.