Binary Nitrogen-Cooled 10 kA Leads

• Published in: IEEE transactions on applied superconductivity Vol. 18; no. 2; pp. 1451 - 1454
• Main Authors: Weijers, H.W., Gavrilin, A.V., Cantrell, K.R., Kenney, S.J., Miller, G.E.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Construction; Copper; Cryogenics; current leads; Design optimization; Electric connection. Cables. Wiring; Electrical engineering. Electrical power engineering; Electromagnets; Exact sciences and technology; High temperature superconductors; Laboratories; Liquid nitrogen; Marketing; Mathematical analysis; Nitrogen; Reservoirs; Resistance heating; Stainless steels; Steady state; Steel; Superconducting magnets; Superconductivity; Various equipment and components; Delivery system; Series connection; Prototype; Shunt; nitrogen; current leads; Steady state; Cryogenic temperature; Stainless steel; Cryogenics; Electrical conductor; Comparative study; High temperature superconductor
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2008.922445

A pair of binary current leads has been constructed with a nitrogen vapor cooled resistive section and a stainless steel shunted HTS lower section. These leads are intended as replacement leads for the NHMFL 45 T Hybrid and also serve as half-current prototypes for the 20 kA leads foreseen for the Series Connected Hybrids that are under development at the NHMFL. An amount of liquid nitrogen is maintained in a reservoir at the bottom of the resistive section such that vapor flow is determined by self- demand. The liquid nitrogen delivery system and properties of the vapor cooled section of the leads are described. A comparison is made between the measured and calculated properties of the resistive section in steady state and transient conditions.