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TY - UNPB AU - Ballarino, A. ED - Liu, Lin ED - Byrd, John M. ED - Neuenschwander, Regis T. ED - Picoreti, Renan ED - Schaa, Volker R. W. TI - MgB₂ Based High-Current Power Transmission Lines for the HL-LHC Magnets: From Concept to Prototype Validation J2 - Proc. of IPAC2021, Campinas, SP, Brazil, 24-28 May 2021 CY - Campinas, SP, Brazil T2 - International Particle Accelerator Conference T3 - 12 LA - english AB - The powering of the HL-LHC magnets requires transferring multiple large quasi-DC currents from the power converters, located in new radiation-free underground galleries, to the magnets. Superconducting power transmission lines based on MgB₂ superconductor, called Superconducting Links, ensure the electrical transmission from the current leads, near the power converters, to the magnets in the LHC main tunnel. They span a physical distance of up to about 120 metres, snaking through a complex underground environment that includes a vertical path of about 10 metres, and transfer DC currents totalling up to 120 kA at temperatures of up to 25 K. This paper summarizes the development done in order to conceive, construct and industrialize cold powering systems including 100 kA Superconducting Links. The systems, which are cooled by the forced flow of helium gas, incorporate HTS REBCO based current leads and Nb-Ti terminations for the connection to the magnets’ busbars. Demonstrator cold powering systems were recently constructed and tested at CERN in nominal and transient conditions representative of the final operation modes. The results from these tests are also presented and discussed. PB - JACoW Publishing CP - Geneva, Switzerland ER -